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hash redis-6.2.14.tar.gz sha256 34e74856cbd66fdb3a684fb349d93961d8c7aa668b06f81fd93ff267d09bc277 http://download.redis.io/releases/redis-6.2.14.tar.gz

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## 远程主机操作系统信息
[root@redis-server ~]# cat /etc/centos-release
CentOS Linux release 7.9.2009 (Core)

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[root@redis-server ~]# ls -lah redis-6.2.14.tar.gz
-rw-r--r-- 1 root root 2.4M Jun 10 17:23 redis-6.2.14.tar.gz
[root@redis-server ~]# sha256sum redis-6.2.14.tar.gz |grep 34e74856cbd66fdb3a684fb349d93961d8c7aa668b06f81fd93ff267d09bc277
34e74856cbd66fdb3a684fb349d93961d8c7aa668b06f81fd93ff267d09bc277  redis-6.2.14.tar.gz
[root@redis-server ~]#

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[root@redis-server ~]# tar -zxvf redis-6.2.14.tar.gz
redis-6.2.14/
redis-6.2.14/.github/
redis-6.2.14/.github/ISSUE_TEMPLATE/
redis-6.2.14/.github/ISSUE_TEMPLATE/bug_report.md
redis-6.2.14/.github/ISSUE_TEMPLATE/crash_report.md
redis-6.2.14/.github/ISSUE_TEMPLATE/feature_request.md
redis-6.2.14/.github/ISSUE_TEMPLATE/other_stuff.md
redis-6.2.14/.github/ISSUE_TEMPLATE/question.md
redis-6.2.14/.github/workflows/
redis-6.2.14/.github/workflows/ci.yml
redis-6.2.14/.github/workflows/daily.yml
redis-6.2.14/.gitignore
redis-6.2.14/00-RELEASENOTES
redis-6.2.14/BUGS
redis-6.2.14/CONDUCT
redis-6.2.14/CONTRIBUTING
redis-6.2.14/COPYING
redis-6.2.14/INSTALL
redis-6.2.14/MANIFESTO
redis-6.2.14/Makefile
redis-6.2.14/README.md
redis-6.2.14/TLS.md
redis-6.2.14/deps/
redis-6.2.14/deps/Makefile
redis-6.2.14/deps/README.md
... 省略
redis-6.2.14/utils/install_server.sh
redis-6.2.14/utils/lru/
redis-6.2.14/utils/lru/README
redis-6.2.14/utils/lru/lfu-simulation.c
redis-6.2.14/utils/lru/test-lru.rb
redis-6.2.14/utils/redis-copy.rb
redis-6.2.14/utils/redis-sha1.rb
redis-6.2.14/utils/redis_init_script
redis-6.2.14/utils/redis_init_script.tpl
redis-6.2.14/utils/releasetools/
redis-6.2.14/utils/releasetools/01_create_tarball.sh
redis-6.2.14/utils/releasetools/02_upload_tarball.sh
redis-6.2.14/utils/releasetools/03_test_release.sh
redis-6.2.14/utils/releasetools/04_release_hash.sh
redis-6.2.14/utils/releasetools/changelog.tcl
redis-6.2.14/utils/speed-regression.tcl
redis-6.2.14/utils/srandmember/
redis-6.2.14/utils/srandmember/README.md
redis-6.2.14/utils/srandmember/showdist.rb
redis-6.2.14/utils/srandmember/showfreq.rb
redis-6.2.14/utils/systemd-redis_multiple_servers@.service
redis-6.2.14/utils/systemd-redis_server.service
redis-6.2.14/utils/tracking_collisions.c
redis-6.2.14/utils/whatisdoing.sh
[root@redis-server ~]# echo $?
0
[root@redis-server ~]#

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[root@redis-server ~]# rpm -qa|grep gcc
libgcc-4.8.5-44.el7.x86_64
gcc-4.8.5-44.el7.x86_64
[root@redis-server ~]#

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[root@redis-server ~]# cd redis-6.2.14
[root@redis-server redis-6.2.14]# ls
00-RELEASENOTES  BUGS  CONDUCT  CONTRIBUTING  COPYING  deps  INSTALL  Makefile  MANIFESTO  README.md  redis.conf  runtest  runtest-cluster  runtest-moduleapi  runtest-sentinel  sentinel.conf  src  tests  TLS.md  utils
[root@redis-server redis-6.2.14]#

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[root@redis-server redis-6.2.14]# make
cd src && make all
make[1]: Entering directory `/root/redis-6.2.14/src'
    CC Makefile.dep
make[1]: Leaving directory `/root/redis-6.2.14/src'
make[1]: Entering directory `/root/redis-6.2.14/src'
rm -rf redis-server redis-sentinel redis-cli redis-benchmark redis-check-rdb redis-check-aof *.o *.gcda *.gcno *.gcov redis.info lcov-html Makefile.dep
rm -f adlist.d quicklist.d ae.d anet.d dict.d server.d sds.d zmalloc.d lzf_c.d lzf_d.d pqsort.d zipmap.d sha1.d ziplist.d release.d networking.d util.d object.d db.d replication.d rdb.d t_string.d t_list.d t_set.d t_zset.d t_hash.d config.d aof.d pubsub.d multi.d debug.d sort.d intset.d syncio.d cluster.d crc16.d endianconv.d slowlog.d scripting.d bio.d rio.d rand.d memtest.d crcspeed.d crc64.d bitops.d sentinel.d notify.d setproctitle.d blocked.d hyperloglog.d latency.d sparkline.d redis-check-rdb.d redis-check-aof.d geo.d lazyfree.d module.d evict.d expire.d geohash.d geohash_helper.d childinfo.d defrag.d siphash.d rax.d t_stream.d listpack.d localtime.d lolwut.d lolwut5.d lolwut6.d acl.d gopher.d tracking.d connection.d tls.d sha256.d timeout.d setcpuaffinity.d monotonic.d mt19937-64.d anet.d adlist.d dict.d redis-cli.d zmalloc.d release.d ae.d crcspeed.d crc64.d siphash.d crc16.d monotonic.d cli_common.d mt19937-64.d ae.d anet.d redis-benchmark.d adlist.d dict.d zmalloc.d release.d crcspeed.d crc64.d siphash.d crc16.d monotonic.d cli_common.d mt19937-64.d
(cd ../deps && make distclean)
make[2]: Entering directory `/root/redis-6.2.14/deps'
(cd hiredis && make clean) > /dev/null || true
(cd linenoise && make clean) > /dev/null || true
(cd lua && make clean) > /dev/null || true
(cd jemalloc && [ -f Makefile ] && make distclean) > /dev/null || true
(cd hdr_histogram && make clean) > /dev/null || true
(rm -f .make-*)
make[2]: Leaving directory `/root/redis-6.2.14/deps'
(cd modules && make clean)
make[2]: Entering directory `/root/redis-6.2.14/src/modules'
rm -rf *.xo *.so
make[2]: Leaving directory `/root/redis-6.2.14/src/modules'
(cd ../tests/modules && make clean)
make[2]: Entering directory `/root/redis-6.2.14/tests/modules'
rm -f commandfilter.so basics.so testrdb.so fork.so infotest.so propagate.so misc.so hooks.so blockonkeys.so blockonbackground.so scan.so datatype.so auth.so keyspace_events.so blockedclient.so getkeys.so test_lazyfree.so timer.so defragtest.so hash.so zset.so stream.so commandfilter.xo basics.xo testrdb.xo fork.xo infotest.xo propagate.xo misc.xo hooks.xo blockonkeys.xo blockonbackground.xo scan.xo datatype.xo auth.xo keyspace_events.xo blockedclient.xo getkeys.xo test_lazyfree.xo timer.xo defragtest.xo hash.xo zset.xo stream.xo
make[2]: Leaving directory `/root/redis-6.2.14/tests/modules'
(rm -f .make-*)
echo STD=-pedantic -DREDIS_STATIC='' -std=c99 >> .make-settings
echo WARN=-Wall -W -Wno-missing-field-initializers >> .make-settings
echo OPT=-O2 >> .make-settings
echo MALLOC=jemalloc >> .make-settings
echo BUILD_TLS= >> .make-settings
echo USE_SYSTEMD= >> .make-settings
echo CFLAGS= >> .make-settings
echo LDFLAGS= >> .make-settings
echo REDIS_CFLAGS= >> .make-settings
echo REDIS_LDFLAGS= >> .make-settings
echo PREV_FINAL_CFLAGS=-pedantic -DREDIS_STATIC='' -std=c99 -Wall -W -Wno-missing-field-initializers -O2 -g -ggdb   -I../deps/hiredis -I../deps/linenoise -I../deps/lua/src -I../deps/hdr_histogram -DUSE_JEMALLOC -I../deps/jemalloc/include >> .make-settings
echo PREV_FINAL_LDFLAGS=  -g -ggdb -rdynamic >> .make-settings
(cd ../deps && make hiredis linenoise lua hdr_histogram jemalloc)
make[2]: Entering directory `/root/redis-6.2.14/deps'
(cd hiredis && make clean) > /dev/null || true
(cd linenoise && make clean) > /dev/null || true
(cd lua && make clean) > /dev/null || true
(cd jemalloc && [ -f Makefile ] && make distclean) > /dev/null || true
(cd hdr_histogram && make clean) > /dev/null || true
(rm -f .make-*)
(echo "" > .make-cflags)
(echo "" > .make-ldflags)
MAKE hiredis
cd hiredis && make static
make[3]: Entering directory `/root/redis-6.2.14/deps/hiredis'
cc -std=c99 -pedantic -c -O3 -fPIC   -Wall -W -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -g -ggdb alloc.c
cc -std=c99 -pedantic -c -O3 -fPIC   -Wall -W -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -g -ggdb net.c
cc -std=c99 -pedantic -c -O3 -fPIC   -Wall -W -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -g -ggdb hiredis.c
cc -std=c99 -pedantic -c -O3 -fPIC   -Wall -W -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -g -ggdb sds.c
cc -std=c99 -pedantic -c -O3 -fPIC   -Wall -W -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -g -ggdb async.c
cc -std=c99 -pedantic -c -O3 -fPIC   -Wall -W -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -g -ggdb read.c
cc -std=c99 -pedantic -c -O3 -fPIC   -Wall -W -Wstrict-prototypes -Wwrite-strings -Wno-missing-field-initializers -g -ggdb sockcompat.c
ar rcs libhiredis.a alloc.o net.o hiredis.o sds.o async.o read.o sockcompat.o
make[3]: Leaving directory `/root/redis-6.2.14/deps/hiredis'
MAKE linenoise
cd linenoise && make
make[3]: Entering directory `/root/redis-6.2.14/deps/linenoise'
cc  -Wall -Os -g  -c linenoise.c
make[3]: Leaving directory `/root/redis-6.2.14/deps/linenoise'
MAKE lua
cd lua/src && make all CFLAGS="-O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP " MYLDFLAGS="" AR="ar rc"
make[3]: Entering directory `/root/redis-6.2.14/deps/lua/src'
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lapi.o lapi.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lcode.o lcode.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o ldebug.o ldebug.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o ldo.o ldo.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o ldump.o ldump.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lfunc.o lfunc.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lgc.o lgc.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o llex.o llex.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lmem.o lmem.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lobject.o lobject.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lopcodes.o lopcodes.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lparser.o lparser.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lstate.o lstate.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lstring.o lstring.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o ltable.o ltable.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o ltm.o ltm.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lundump.o lundump.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lvm.o lvm.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lzio.o lzio.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o strbuf.o strbuf.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o fpconv.o fpconv.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lauxlib.o lauxlib.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lbaselib.o lbaselib.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o ldblib.o ldblib.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o liolib.o liolib.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lmathlib.o lmathlib.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o loslib.o loslib.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o ltablib.o ltablib.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lstrlib.o lstrlib.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o loadlib.o loadlib.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o linit.o linit.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lua_cjson.o lua_cjson.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lua_struct.o lua_struct.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lua_cmsgpack.o lua_cmsgpack.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lua_bit.o lua_bit.c
ar rc liblua.a lapi.o lcode.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o lundump.o lvm.o lzio.o strbuf.o fpconv.o lauxlib.o lbaselib.o ldblib.o liolib.o lmathlib.o loslib.o ltablib.o lstrlib.o loadlib.o linit.o lua_cjson.o lua_struct.o lua_cmsgpack.o lua_bit.o # DLL needs all object files
ranlib liblua.a
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o lua.o lua.c
cc -o lua  lua.o liblua.a -lm
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o luac.o luac.c
cc -O2 -Wall -DLUA_ANSI -DENABLE_CJSON_GLOBAL -DREDIS_STATIC='' -DLUA_USE_MKSTEMP    -c -o print.o print.c
cc -o luac  luac.o print.o liblua.a -lm
make[3]: Leaving directory `/root/redis-6.2.14/deps/lua/src'
MAKE hdr_histogram
cd hdr_histogram && make
make[3]: Entering directory `/root/redis-6.2.14/deps/hdr_histogram'
cc  -Wall -Os -g  -c  hdr_histogram.c
make[3]: Leaving directory `/root/redis-6.2.14/deps/hdr_histogram'
MAKE jemalloc
cd jemalloc && ./configure --with-version=5.1.0-0-g0 --with-lg-quantum=3 --with-jemalloc-prefix=je_ CFLAGS="-std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops " LDFLAGS=""
checking for xsltproc... /usr/bin/xsltproc
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether compiler is cray... no
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checking whether compiler supports -Wshorten-64-to-32... no
checking whether compiler supports -Wsign-compare... yes
checking whether compiler supports -Wundef... yes
checking whether compiler supports -Wno-format-zero-length... yes
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checking whether compiler supports -g3... yes
checking how to run the C preprocessor... gcc -E
checking for g++... no
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configure: No compiler with C++14 support was found
checking for grep that handles long lines and -e... /usr/bin/grep
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checking for ANSI C header files... yes
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checking whether byte ordering is bigendian... no
checking size of void *... 8
checking size of int... 4
checking size of long... 8
checking size of long long... 8
checking size of intmax_t... 8
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking whether pause instruction is compilable... yes
checking number of significant virtual address bits... 48
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checking malloc.h usability... yes
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checking for library containing log... -lm
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checking whether compiler supports -Werror... yes
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checking whether compiler supports -funroll-loops... yes
checking configured backtracing method... N/A
checking for sbrk... yes
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checking whether clock_gettime(CLOCK_MONOTONIC_COARSE, ...) is compilable... yes
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checking for TLS... yes
checking whether C11 atomics is compilable... no
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checking whether GCC __sync atomics is compilable... yes
checking whether Darwin OSAtomic*() is compilable... no
checking whether madvise(2) is compilable... yes
checking whether madvise(..., MADV_FREE) is compilable... no
checking whether madvise(..., MADV_DONTNEED) is compilable... yes
checking whether madvise(..., MADV_DO[NT]DUMP) is compilable... yes
checking whether madvise(..., MADV_[NO]HUGEPAGE) is compilable... yes
checking whether to force 32-bit __sync_{add,sub}_and_fetch()... no
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checking whether Darwin os_unfair_lock_*() is compilable... no
checking whether Darwin OSSpin*() is compilable... no
checking whether glibc malloc hook is compilable... yes
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checking whether compiler supports -Werror... yes
checking whether compiler supports -herror_on_warning... no
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checking for stdbool.h that conforms to C99... yes
checking for _Bool... yes
configure: creating ./config.status
config.status: creating Makefile
config.status: creating jemalloc.pc
config.status: creating doc/html.xsl
config.status: creating doc/manpages.xsl
config.status: creating doc/jemalloc.xml
config.status: creating include/jemalloc/jemalloc_macros.h
config.status: creating include/jemalloc/jemalloc_protos.h
config.status: creating include/jemalloc/jemalloc_typedefs.h
config.status: creating include/jemalloc/internal/jemalloc_preamble.h
config.status: creating test/test.sh
config.status: creating test/include/test/jemalloc_test.h
config.status: creating config.stamp
config.status: creating bin/jemalloc-config
config.status: creating bin/jemalloc.sh
config.status: creating bin/jeprof
config.status: creating include/jemalloc/jemalloc_defs.h
config.status: creating include/jemalloc/internal/jemalloc_internal_defs.h
config.status: creating test/include/test/jemalloc_test_defs.h
config.status: executing include/jemalloc/internal/public_symbols.txt commands
config.status: executing include/jemalloc/internal/private_symbols.awk commands
config.status: executing include/jemalloc/internal/private_symbols_jet.awk commands
config.status: executing include/jemalloc/internal/public_namespace.h commands
config.status: executing include/jemalloc/internal/public_unnamespace.h commands
config.status: executing include/jemalloc/internal/size_classes.h commands
config.status: executing include/jemalloc/jemalloc_protos_jet.h commands
config.status: executing include/jemalloc/jemalloc_rename.h commands
config.status: executing include/jemalloc/jemalloc_mangle.h commands
config.status: executing include/jemalloc/jemalloc_mangle_jet.h commands
config.status: executing include/jemalloc/jemalloc.h commands
===============================================================================
jemalloc version   : 5.1.0-0-g0
library revision   : 2

CONFIG             : --with-version=5.1.0-0-g0 --with-lg-quantum=3 --with-jemalloc-prefix=je_ 'CFLAGS=-std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops ' LDFLAGS=
CC                 : gcc
CONFIGURE_CFLAGS   : -std=gnu11 -Wall -Wsign-compare -Wundef -Wno-format-zero-length -pipe -g3 -fvisibility=hidden -O3 -funroll-loops
SPECIFIED_CFLAGS   : -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops
EXTRA_CFLAGS       :
CPPFLAGS           : -D_GNU_SOURCE -D_REENTRANT
CXX                : g++
CONFIGURE_CXXFLAGS :
SPECIFIED_CXXFLAGS :
EXTRA_CXXFLAGS     :
LDFLAGS            :
EXTRA_LDFLAGS      :
DSO_LDFLAGS        : -shared -Wl,-soname,$(@F)
LIBS               : -lm  -lpthread -ldl
RPATH_EXTRA        :

XSLTPROC           : /usr/bin/xsltproc
XSLROOT            :

PREFIX             : /usr/local
BINDIR             : /usr/local/bin
DATADIR            : /usr/local/share
INCLUDEDIR         : /usr/local/include
LIBDIR             : /usr/local/lib
MANDIR             : /usr/local/share/man

srcroot            :
abs_srcroot        : /root/redis-6.2.14/deps/jemalloc/
objroot            :
abs_objroot        : /root/redis-6.2.14/deps/jemalloc/

JEMALLOC_PREFIX    : je_
JEMALLOC_PRIVATE_NAMESPACE
                   : je_
install_suffix     :
malloc_conf        :
autogen            : 0
debug              : 0
stats              : 1
prof               : 0
prof-libunwind     : 0
prof-libgcc        : 0
prof-gcc           : 0
fill               : 1
utrace             : 0
xmalloc            : 0
log                : 0
lazy_lock          : 0
cache-oblivious    : 1
cxx                : 0
===============================================================================
cd jemalloc && make CFLAGS="-std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops " LDFLAGS="" lib/libjemalloc.a
make[3]: Entering directory `/root/redis-6.2.14/deps/jemalloc'
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/jemalloc.sym.o src/jemalloc.c
nm -a src/jemalloc.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/jemalloc.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/arena.sym.o src/arena.c
nm -a src/arena.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/arena.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/background_thread.sym.o src/background_thread.c
nm -a src/background_thread.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/background_thread.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/base.sym.o src/base.c
nm -a src/base.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/base.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/bin.sym.o src/bin.c
nm -a src/bin.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/bin.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/bitmap.sym.o src/bitmap.c
nm -a src/bitmap.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/bitmap.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/ckh.sym.o src/ckh.c
nm -a src/ckh.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/ckh.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/ctl.sym.o src/ctl.c
nm -a src/ctl.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/ctl.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/div.sym.o src/div.c
nm -a src/div.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/div.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/extent.sym.o src/extent.c
nm -a src/extent.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/extent.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/extent_dss.sym.o src/extent_dss.c
nm -a src/extent_dss.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/extent_dss.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/extent_mmap.sym.o src/extent_mmap.c
nm -a src/extent_mmap.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/extent_mmap.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/hash.sym.o src/hash.c
nm -a src/hash.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/hash.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/hooks.sym.o src/hooks.c
nm -a src/hooks.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/hooks.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/large.sym.o src/large.c
nm -a src/large.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/large.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/log.sym.o src/log.c
nm -a src/log.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/log.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/malloc_io.sym.o src/malloc_io.c
nm -a src/malloc_io.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/malloc_io.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/mutex.sym.o src/mutex.c
nm -a src/mutex.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/mutex.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/mutex_pool.sym.o src/mutex_pool.c
nm -a src/mutex_pool.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/mutex_pool.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/nstime.sym.o src/nstime.c
nm -a src/nstime.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/nstime.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/pages.sym.o src/pages.c
nm -a src/pages.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/pages.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/prng.sym.o src/prng.c
nm -a src/prng.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/prng.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/prof.sym.o src/prof.c
nm -a src/prof.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/prof.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/rtree.sym.o src/rtree.c
nm -a src/rtree.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/rtree.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/stats.sym.o src/stats.c
nm -a src/stats.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/stats.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/sz.sym.o src/sz.c
nm -a src/sz.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/sz.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/tcache.sym.o src/tcache.c
nm -a src/tcache.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/tcache.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/ticker.sym.o src/ticker.c
nm -a src/ticker.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/ticker.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/tsd.sym.o src/tsd.c
nm -a src/tsd.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/tsd.sym
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -DJEMALLOC_NO_PRIVATE_NAMESPACE -o src/witness.sym.o src/witness.c
nm -a src/witness.sym.o | gawk -f include/jemalloc/internal/private_symbols.awk > src/witness.sym
/bin/sh include/jemalloc/internal/private_namespace.sh src/jemalloc.sym src/arena.sym src/background_thread.sym src/base.sym src/bin.sym src/bitmap.sym src/ckh.sym src/ctl.sym src/div.sym src/extent.sym src/extent_dss.sym src/extent_mmap.sym src/hash.sym src/hooks.sym src/large.sym src/log.sym src/malloc_io.sym src/mutex.sym src/mutex_pool.sym src/nstime.sym src/pages.sym src/prng.sym src/prof.sym src/rtree.sym src/stats.sym src/sz.sym src/tcache.sym src/ticker.sym src/tsd.sym src/witness.sym > include/jemalloc/internal/private_namespace.gen.h
cp include/jemalloc/internal/private_namespace.gen.h include/jemalloc/internal/private_namespace.gen.h
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/jemalloc.o src/jemalloc.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/arena.o src/arena.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/background_thread.o src/background_thread.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/base.o src/base.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/bin.o src/bin.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/bitmap.o src/bitmap.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/ckh.o src/ckh.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/ctl.o src/ctl.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/div.o src/div.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/extent.o src/extent.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/extent_dss.o src/extent_dss.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/extent_mmap.o src/extent_mmap.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/hash.o src/hash.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/hooks.o src/hooks.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/large.o src/large.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/log.o src/log.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/malloc_io.o src/malloc_io.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/mutex.o src/mutex.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/mutex_pool.o src/mutex_pool.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/nstime.o src/nstime.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/pages.o src/pages.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/prng.o src/prng.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/prof.o src/prof.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/rtree.o src/rtree.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/stats.o src/stats.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/sz.o src/sz.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/tcache.o src/tcache.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/ticker.o src/ticker.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/tsd.o src/tsd.c
gcc -std=gnu99 -Wall -pipe -g3 -O3 -funroll-loops  -c -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/witness.o src/witness.c
ar crus lib/libjemalloc.a src/jemalloc.o src/arena.o src/background_thread.o src/base.o src/bin.o src/bitmap.o src/ckh.o src/ctl.o src/div.o src/extent.o src/extent_dss.o src/extent_mmap.o src/hash.o src/hooks.o src/large.o src/log.o src/malloc_io.o src/mutex.o src/mutex_pool.o src/nstime.o src/pages.o src/prng.o src/prof.o src/rtree.o src/stats.o src/sz.o src/tcache.o src/ticker.o src/tsd.o src/witness.o
make[3]: Leaving directory `/root/redis-6.2.14/deps/jemalloc'
make[2]: Leaving directory `/root/redis-6.2.14/deps'
    CC adlist.o
    CC quicklist.o
    CC ae.o
    CC anet.o
    CC dict.o
    CC server.o
    CC sds.o
    CC zmalloc.o
    CC lzf_c.o
    CC lzf_d.o
    CC pqsort.o
    CC zipmap.o
    CC sha1.o
    CC ziplist.o
    CC release.o
    CC networking.o
    CC util.o
    CC object.o
    CC db.o
    CC replication.o
    CC rdb.o
    CC t_string.o
    CC t_list.o
    CC t_set.o
    CC t_zset.o
    CC t_hash.o
    CC config.o
    CC aof.o
    CC pubsub.o
    CC multi.o
    CC debug.o
    CC sort.o
    CC intset.o
    CC syncio.o
    CC cluster.o
    CC crc16.o
    CC endianconv.o
    CC slowlog.o
    CC scripting.o
    CC bio.o
    CC rio.o
    CC rand.o
    CC memtest.o
    CC crcspeed.o
    CC crc64.o
    CC bitops.o
    CC sentinel.o
    CC notify.o
    CC setproctitle.o
    CC blocked.o
    CC hyperloglog.o
    CC latency.o
    CC sparkline.o
    CC redis-check-rdb.o
    CC redis-check-aof.o
    CC geo.o
    CC lazyfree.o
    CC module.o
    CC evict.o
    CC expire.o
    CC geohash.o
    CC geohash_helper.o
    CC childinfo.o
    CC defrag.o
    CC siphash.o
    CC rax.o
    CC t_stream.o
    CC listpack.o
    CC localtime.o
    CC lolwut.o
    CC lolwut5.o
    CC lolwut6.o
    CC acl.o
    CC gopher.o
    CC tracking.o
    CC connection.o
    CC tls.o
    CC sha256.o
    CC timeout.o
    CC setcpuaffinity.o
    CC monotonic.o
    CC mt19937-64.o
    LINK redis-server
    INSTALL redis-sentinel
    CC redis-cli.o
    CC cli_common.o
    LINK redis-cli
    CC redis-benchmark.o
    LINK redis-benchmark
    INSTALL redis-check-rdb
    INSTALL redis-check-aof

Hint: It's a good idea to run 'make test' ;)

make[1]: Leaving directory `/root/redis-6.2.14/src'
[root@redis-server redis-6.2.14]#

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[root@redis-server redis-6.2.14]# make install PREFIX=/srv/redis-6.2.14
cd src && make install
make[1]: Entering directory `/root/redis-6.2.14/src'
    CC Makefile.dep
make[1]: Leaving directory `/root/redis-6.2.14/src'
make[1]: Entering directory `/root/redis-6.2.14/src'

Hint: It's a good idea to run 'make test' ;)

    INSTALL redis-server
    INSTALL redis-benchmark
    INSTALL redis-cli
make[1]: Leaving directory `/root/redis-6.2.14/src'
[root@redis-server redis-6.2.14]# echo $?
0
[root@redis-server redis-6.2.14]# ll /srv/redis-6.2.14
total 0
drwxr-xr-x 2 root root 134 Jun 10 18:25 bin
[root@redis-server redis-6.2.14]# ll /srv/redis-6.2.14/bin/
total 18936
-rwxr-xr-x 1 root root 4830616 Jun 10 18:25 redis-benchmark
lrwxrwxrwx 1 root root      12 Jun 10 18:25 redis-check-aof -> redis-server
lrwxrwxrwx 1 root root      12 Jun 10 18:25 redis-check-rdb -> redis-server
-rwxr-xr-x 1 root root 5004728 Jun 10 18:25 redis-cli
lrwxrwxrwx 1 root root      12 Jun 10 18:25 redis-sentinel -> redis-server
-rwxr-xr-x 1 root root 9548176 Jun 10 18:25 redis-server
[root@redis-server redis-6.2.14]#

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[root@redis-server redis-6.2.14]# cd /srv/redis-6.2.14/bin/
[root@redis-server bin]# ./redis-server --version
Redis server v=6.2.14 sha=00000000:0 malloc=jemalloc-5.1.0 bits=64 build=ad623970888ef0a
[root@redis-server bin]# ./redis-cli --version
redis-cli 6.2.14
[root@redis-server bin]#

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[root@redis-server ~]# ls -lah redis-6.2.14/redis.conf
-rw-rw-r-- 1 root root 92K Oct 18  2023 redis-6.2.14/redis.conf
[root@redis-server ~]# cd /srv/redis-6.2.14
[root@redis-server redis-6.2.14]# mkdir conf
[root@redis-server redis-6.2.14]# cp -p ~/redis-6.2.14/redis.conf conf
[root@redis-server redis-6.2.14]# ls -lah conf/redis.conf
-rw-rw-r-- 1 root root 92K Oct 18  2023 conf/redis.conf
[root@redis-server redis-6.2.14]#

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[root@redis-server redis-6.2.14]# cp -p conf/redis.conf conf/redis.conf.default
[root@redis-server redis-6.2.14]# md5sum conf/*
d9a1e1fba487325b188ee5ec7bd78ae5  conf/redis.conf
d9a1e1fba487325b188ee5ec7bd78ae5  conf/redis.conf.default
[root@redis-server redis-6.2.14]#

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[root@redis-server redis-6.2.14]# grep -v '#' conf/redis.conf|awk NF
bind 192.168.56.121 127.0.0.1
protected-mode no
port 29736
tcp-backlog 511
timeout 300
tcp-keepalive 300
daemonize no
pidfile /srv/redis/pid/redis_29736.pid
loglevel notice
logfile "/srv/redis/logs/redis_29736.log"
crash-log-enabled yes
databases 16
always-show-logo no
set-proc-title no
proc-title-template "{title} {listen-addr} {server-mode}"
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
rdb-del-sync-files no
dir /srv/redis/data
replica-serve-stale-data yes
replica-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-diskless-load disabled
repl-disable-tcp-nodelay no
replica-priority 100
acllog-max-len 128
requirepass ALONGPASSWORD
maxmemory 1gb
lazyfree-lazy-eviction no
lazyfree-lazy-expire no
lazyfree-lazy-server-del no
replica-lazy-flush no
lazyfree-lazy-user-del no
lazyfree-lazy-user-flush no
oom-score-adj no
oom-score-adj-values 0 200 800
disable-thp yes
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
aof-use-rdb-preamble yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
stream-node-max-bytes 4096
stream-node-max-entries 100
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
dynamic-hz yes
aof-rewrite-incremental-fsync yes
rdb-save-incremental-fsync yes
jemalloc-bg-thread yes
[root@redis-server redis-6.2.14]#

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## Redis configuration file example.
##
## Note that in order to read the configuration file, Redis must be
## started with the file path as first argument:
##
## ./redis-server /path/to/redis.conf

## Note on units: when memory size is needed, it is possible to specify
## it in the usual form of 1k 5GB 4M and so forth:
##
## 1k => 1000 bytes
## 1kb => 1024 bytes
## 1m => 1000000 bytes
## 1mb => 1024*1024 bytes
## 1g => 1000000000 bytes
## 1gb => 1024*1024*1024 bytes
##
## units are case insensitive so 1GB 1Gb 1gB are all the same.

################################### INCLUDES ###################################

## Include one or more other config files here.  This is useful if you
## have a standard template that goes to all Redis servers but also need
## to customize a few per-server settings.  Include files can include
## other files, so use this wisely.
##
## Note that option "include" won't be rewritten by command "CONFIG REWRITE"
## from admin or Redis Sentinel. Since Redis always uses the last processed
## line as value of a configuration directive, you'd better put includes
## at the beginning of this file to avoid overwriting config change at runtime.
##
## If instead you are interested in using includes to override configuration
## options, it is better to use include as the last line.
##
## include /path/to/local.conf
## include /path/to/other.conf

################################### MODULES #####################################

## Load modules at startup. If the server is not able to load modules
## it will abort. It is possible to use multiple loadmodule directives.
##
## loadmodule /path/to/my_module.so
## loadmodule /path/to/other_module.so

################################### NETWORK #####################################

## By default, if no "bind" configuration directive is specified, Redis listens
## for connections from all available network interfaces on the host machine.
## It is possible to listen to just one or multiple selected interfaces using
## the "bind" configuration directive, followed by one or more IP addresses.
## Each address can be prefixed by "-", which means that redis will not fail to
## start if the address is not available. Being not available only refers to
## addresses that does not correspond to any network interfece. Addresses that
## are already in use will always fail, and unsupported protocols will always BE
## silently skipped.
##
## Examples:
##
## bind 192.168.1.100 10.0.0.1     # listens on two specific IPv4 addresses
## bind 127.0.0.1 ::1              # listens on loopback IPv4 and IPv6
## bind * -::*                     # like the default, all available interfaces


##
## ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the
## internet, binding to all the interfaces is dangerous and will expose the
## instance to everybody on the internet. So by default we uncomment the
## following bind directive, that will force Redis to listen only on the
## IPv4 and IPv6 (if available) loopback interface addresses (this means Redis
## will only be able to accept client connections from the same host that it is
## running on).
##
## IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
## JUST COMMENT OUT THE FOLLOWING LINE.
## ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
## bind 127.0.0.1 -::1

## BEGIN MEIZHAOHUI COMMENTS
##   bind 配置的是 redis server 网卡的地址，配置哪个网卡地址，
##   你就可以通过哪个网卡地址访问redis,而不是外部访问redis的ip列表
## END MEIZHAOHUI COMMENTS
bind 192.168.56.121 127.0.0.1

## Protected mode is a layer of security protection, in order to avoid that
## Redis instances left open on the internet are accessed and exploited.
##
## When protected mode is on and if:
##
## 1) The server is not binding explicitly to a set of addresses using the
##    "bind" directive.
## 2) No password is configured.
##
## The server only accepts connections from clients connecting from the
## IPv4 and IPv6 loopback addresses 127.0.0.1 and ::1, and from Unix domain
## sockets.
##
## By default protected mode is enabled. You should disable it only if
## you are sure you want clients from other hosts to connect to Redis
## even if no authentication is configured, nor a specific set of interfaces
## are explicitly listed using the "bind" directive.
## protected-mode yes

## BEGIN MEIZHAOHUI COMMENTS
##   protected-mode yes 保护模式，这种模式限制了只有本地可以访问redis服务器
##   如果需要外部客户端连接redis服务器，则应设置为 protected-mode no 非保护模式
## END MEIZHAOHUI COMMENTS
protected-mode no

## Accept connections on the specified port, default is 6379 (IANA #815344).
## If port 0 is specified Redis will not listen on a TCP socket.
## port 6379

## BEGIN MEIZHAOHUI COMMENTS
##   redis服务监听端口，默认6379
##   使用默认的端口号不是很安全，为了安全一点，需要修改默认的端口号
##   建议修改为10000以上，60000以下的端口，我这里设置为29736
## END MEIZHAOHUI COMMENTS
port 29736

## TCP listen() backlog.
##
## In high requests-per-second environments you need a high backlog in order
## to avoid slow clients connection issues. Note that the Linux kernel
## will silently truncate it to the value of /proc/sys/net/core/somaxconn so
## make sure to raise both the value of somaxconn and tcp_max_syn_backlog
## in order to get the desired effect.
tcp-backlog 511
## BEGIN MEIZHAOHUI COMMENTS
##   在linux系统中控制tcp三次握手已完成连接队列的长度
##   在高并发系统中，你需要设置一个较高的tcp-backlog来避免客户端连接速度慢的问题（三次握手的速度）
##   取 /proc/sys/net/core/somaxconn 和 tcp-backlog 配置两者中的小值
##   对于负载很大的服务程序来说一般会将它修改为2048或者更大。
##   在/etc/sysctl.conf中添加:net.core.somaxconn = 2048，然后在终端中执行sysctl -p
## END MEIZHAOHUI COMMENTS


## Unix socket.
##
## Specify the path for the Unix socket that will be used to listen for
## incoming connections. There is no default, so Redis will not listen
## on a unix socket when not specified.
##
## unixsocket /run/redis.sock
## unixsocketperm 700

## Close the connection after a client is idle for N seconds (0 to disable)
## timeout 0

## BEGIN MEIZHAOHUI COMMENTS
##   客户端空闲超时时间，默认为0，关闭超时时间
##   我设置为300秒，当客户端闲置300秒后关闭连接
## END MEIZHAOHUI COMMENTS
timeout 300

## TCP keepalive.
##
## If non-zero, use SO_KEEPALIVE to send TCP ACKs to clients in absence
## of communication. This is useful for two reasons:
##
## 1) Detect dead peers.
## 2) Force network equipment in the middle to consider the connection to be
##    alive.
##
## On Linux, the specified value (in seconds) is the period used to send ACKs.
## Note that to close the connection the double of the time is needed.
## On other kernels the period depends on the kernel configuration.
##
## A reasonable value for this option is 300 seconds, which is the new
## Redis default starting with Redis 3.2.1.
tcp-keepalive 300

## BEGIN MEIZHAOHUI COMMENTS
##   它是 TCP 连接保活策略，可以通过 tcp-keepalive 配置项来进行设置，单位为秒
##   假如设置为 60 秒，则 server 端会每 60 秒向连接空闲的客户端发起一次 ACK 请求，
##   以检查客户端是否已经挂掉，对于无响应的客户端则会关闭其连接。
##   如果设置为 0，则不会进行保活检测（默认为 tcp-keepalive 300）
## END MEIZHAOHUI COMMENTS


################################## TLS/SSL #####################################

## By default, TLS/SSL is disabled. To enable it, the "tls-port" configuration
## directive can be used to define TLS-listening ports. To enable TLS on the
## default port, use:
##
## port 0
## tls-port 6379

## Configure a X.509 certificate and private key to use for authenticating the
## server to connected clients, masters or cluster peers.  These files should be
## PEM formatted.
##
## tls-cert-file redis.crt 
## tls-key-file redis.key
##
## If the key file is encrypted using a passphrase, it can be included here
## as well.
##
## tls-key-file-pass secret

## Normally Redis uses the same certificate for both server functions (accepting
## connections) and client functions (replicating from a master, establishing
## cluster bus connections, etc.).
##
## Sometimes certificates are issued with attributes that designate them as
## client-only or server-only certificates. In that case it may be desired to use
## different certificates for incoming (server) and outgoing (client)
## connections. To do that, use the following directives:
##
## tls-client-cert-file client.crt
## tls-client-key-file client.key
##
## If the key file is encrypted using a passphrase, it can be included here
## as well.
##
## tls-client-key-file-pass secret

## Configure a DH parameters file to enable Diffie-Hellman (DH) key exchange,
## required by older versions of OpenSSL (<3.0). Newer versions do not require
## this configuration and recommend against it.
##
## tls-dh-params-file redis.dh

## Configure a CA certificate(s) bundle or directory to authenticate TLS/SSL
## clients and peers.  Redis requires an explicit configuration of at least one
## of these, and will not implicitly use the system wide configuration.
##
## tls-ca-cert-file ca.crt
## tls-ca-cert-dir /etc/ssl/certs

## By default, clients (including replica servers) on a TLS port are required
## to authenticate using valid client side certificates.
##
## If "no" is specified, client certificates are not required and not accepted.
## If "optional" is specified, client certificates are accepted and must be
## valid if provided, but are not required.
##
## tls-auth-clients no
## tls-auth-clients optional

## By default, a Redis replica does not attempt to establish a TLS connection
## with its master.
##
## Use the following directive to enable TLS on replication links.
##
## tls-replication yes

## By default, the Redis Cluster bus uses a plain TCP connection. To enable
## TLS for the bus protocol, use the following directive:
##
## tls-cluster yes

## By default, only TLSv1.2 and TLSv1.3 are enabled and it is highly recommended
## that older formally deprecated versions are kept disabled to reduce the attack surface.
## You can explicitly specify TLS versions to support.
## Allowed values are case insensitive and include "TLSv1", "TLSv1.1", "TLSv1.2",
## "TLSv1.3" (OpenSSL >= 1.1.1) or any combination.
## To enable only TLSv1.2 and TLSv1.3, use:
##
## tls-protocols "TLSv1.2 TLSv1.3"

## Configure allowed ciphers.  See the ciphers(1ssl) manpage for more information
## about the syntax of this string.
##
## Note: this configuration applies only to <= TLSv1.2.
##
## tls-ciphers DEFAULT:!MEDIUM

## Configure allowed TLSv1.3 ciphersuites.  See the ciphers(1ssl) manpage for more
## information about the syntax of this string, and specifically for TLSv1.3
## ciphersuites.
##
## tls-ciphersuites TLS_CHACHA20_POLY1305_SHA256

## When choosing a cipher, use the server's preference instead of the client
## preference. By default, the server follows the client's preference.
##
## tls-prefer-server-ciphers yes

## By default, TLS session caching is enabled to allow faster and less expensive
## reconnections by clients that support it. Use the following directive to disable
## caching.
##
## tls-session-caching no

## Change the default number of TLS sessions cached. A zero value sets the cache
## to unlimited size. The default size is 20480.
##
## tls-session-cache-size 5000

## Change the default timeout of cached TLS sessions. The default timeout is 300
## seconds.
##
## tls-session-cache-timeout 60

################################## GENERAL #####################################

## By default Redis does not run as a daemon. Use 'yes' if you need it.
## Note that Redis will write a pid file in /var/run/redis.pid when daemonized.
## When Redis is supervised by upstart or systemd, this parameter has no impact.
daemonize no

## BEGIN MEIZHAOHUI COMMENTS
##   是否以守护进程方式运行
##   我后面需要使用supervisor来启动Redis，因此不以守护进程方式运行
## END MEIZHAOHUI COMMENTS


## If you run Redis from upstart or systemd, Redis can interact with your
## supervision tree. Options:
##   supervised no      - no supervision interaction
##   supervised upstart - signal upstart by putting Redis into SIGSTOP mode
##                        requires "expect stop" in your upstart job config
##   supervised systemd - signal systemd by writing READY=1 to $NOTIFY_SOCKET
##                        on startup, and updating Redis status on a regular
##                        basis.
##   supervised auto    - detect upstart or systemd method based on
##                        UPSTART_JOB or NOTIFY_SOCKET environment variables
## Note: these supervision methods only signal "process is ready."
##       They do not enable continuous pings back to your supervisor.
##
## The default is "no". To run under upstart/systemd, you can simply uncomment
## the line below:
##
## supervised auto

## BEGIN MEIZHAOHUI COMMENTS
##   若从upstart或systemd运行Redis，则Redis可以与监控树交互。
##   supervised no      - 无相互监督，默认
##   supervised upstart - 使Redis进入SIGSTOP模式并监控upstart
##   supervised systemd - 通过设置READY=1到$NOTIFY_SOCKET来监控systemd
##   supervised auto    - 基于UPSTART_JOB或NOTIFY_SOCKET环境变量的监督自动检测upstart或systemd方法
## END MEIZHAOHUI COMMENTS



## If a pid file is specified, Redis writes it where specified at startup
## and removes it at exit.
##
## When the server runs non daemonized, no pid file is created if none is
## specified in the configuration. When the server is daemonized, the pid file
## is used even if not specified, defaulting to "/var/run/redis.pid".
##
## Creating a pid file is best effort: if Redis is not able to create it
## nothing bad happens, the server will start and run normally.
##
## Note that on modern Linux systems "/run/redis.pid" is more conforming
## and should be used instead.
## pidfile /var/run/redis_6379.pid

## BEGIN MEIZHAOHUI COMMENTS
##   设置PID文件，我将redis相关的文件都放在 /srv/redis 目录下
## END MEIZHAOHUI COMMENTS
pidfile /srv/redis/pid/redis_29736.pid

## Specify the server verbosity level.
## This can be one of:
## debug (a lot of information, useful for development/testing)
## verbose (many rarely useful info, but not a mess like the debug level)
## notice (moderately verbose, what you want in production probably)
## warning (only very important / critical messages are logged)
loglevel notice

## BEGIN MEIZHAOHUI COMMENTS
##   loglevel 指定日志级别
##   开发阶段可以设置成 debug，生产阶段通常设置为 notice 或者 warning，默认为 loglevel notice
## END MEIZHAOHUI COMMENTS

## Specify the log file name. Also the empty string can be used to force
## Redis to log on the standard output. Note that if you use standard
## output for logging but daemonize, logs will be sent to /dev/null
## logfile ""

## BEGIN MEIZHAOHUI COMMENTS
##   logfile 指定日志文件
##   redis 在运行过程中，会输出一些日志信息；默认情况下，这些日志信息会输出到控制台；
##   我们可以使用 logfile 配置日志文件，使 redis 把日志信息输出到指定文件中
## END MEIZHAOHUI COMMENTS
logfile "/srv/redis/logs/redis_29736.log"

## To enable logging to the system logger, just set 'syslog-enabled' to yes,
## and optionally update the other syslog parameters to suit your needs.
## syslog-enabled no
## BEGIN MEIZHAOHUI COMMENTS
##   syslog-enabled 是否把日志输出到系统日志，默认no，即不输出到系统日志
## END MEIZHAOHUI COMMENTS


## Specify the syslog identity.
## syslog-ident redis
## BEGIN MEIZHAOHUI COMMENTS
##   syslog-ident 指定syslog的标示符，如果'syslog-enabled'是no，则这个选项无效
## END MEIZHAOHUI COMMENTS


## Specify the syslog facility. Must be USER or between LOCAL0-LOCAL7.
## syslog-facility local0
## BEGIN MEIZHAOHUI COMMENTS
##   syslog-facility 指定syslog 设备（facility), 必须是USER或者LOCAL0到LOCAL7
## END MEIZHAOHUI COMMENTS

## To disable the built in crash log, which will possibly produce cleaner core
## dumps when they are needed, uncomment the following:
##
## crash-log-enabled no
## BEGIN MEIZHAOHUI COMMENTS
##   crash-log-enabled参数用于启用或禁用Redis的崩溃日志功能
##   当Redis发生崩溃时，崩溃日志将被记录在特定的日志文件中，以帮助用户诊断和调试问题。
##   如果你禁用了崩溃日志功能，当Redis发生崩溃时，你将无法获得相关的日志信息，可能会增加故障排查的难度。
##   因此，一般情况下建议将crash-log-enabled参数设置为"yes"
## END MEIZHAOHUI COMMENTS
crash-log-enabled yes

## To disable the fast memory check that's run as part of the crash log, which
## will possibly let redis terminate sooner, uncomment the following:
##
## crash-memcheck-enabled no
## BEGIN MEIZHAOHUI COMMENTS
##   crash-memcheck-enabled是一个启用或禁用内存检查的参数。
##   当启用内存检查时，Redis会使用Valgrind实用程序memcheck来检查内存错误和泄漏。
##   这有助于发现和修复潜在的内存问题
##   请注意，启用内存检查会显著影响Redis的性能，因为它会增加运行时开销。
##   因此，仅在调试或测试目的时才应启用此参数。在生产环境中，应禁用它以获得最佳性能。
##   因此，保持默认crash-memcheck-enabled no即可
## END MEIZHAOHUI COMMENTS


## Set the number of databases. The default database is DB 0, you can select
## a different one on a per-connection basis using SELECT <dbid> where
## dbid is a number between 0 and 'databases'-1
databases 16
## BEGIN MEIZHAOHUI COMMENTS
##   设置数据库的数量，默认16个
## END MEIZHAOHUI COMMENTS


## By default Redis shows an ASCII art logo only when started to log to the
## standard output and if the standard output is a TTY and syslog logging is
## disabled. Basically this means that normally a logo is displayed only in
## interactive sessions.
##
## However it is possible to force the pre-4.0 behavior and always show a
## ASCII art logo in startup logs by setting the following option to yes.
always-show-logo no
## BEGIN MEIZHAOHUI COMMENTS
##   Redis服务器在启动时是否显示LOGO
## END MEIZHAOHUI COMMENTS

## By default, Redis modifies the process title (as seen in 'top' and 'ps') to
## provide some runtime information. It is possible to disable this and leave
## the process name as executed by setting the following to no.
## set-proc-title yes
## BEGIN MEIZHAOHUI COMMENTS
##   设置Redis进程的标题，我不自定义标题
##   设置 set-proc-title no
## END MEIZHAOHUI COMMENTS
set-proc-title no

## When changing the process title, Redis uses the following template to construct
## the modified title.
##
## Template variables are specified in curly brackets. The following variables are
## supported:
##
## {title}           Name of process as executed if parent, or type of child process.
## {listen-addr}     Bind address or '*' followed by TCP or TLS port listening on, or
##                   Unix socket if only that's available.
## {server-mode}     Special mode, i.e. "[sentinel]" or "[cluster]".
## {port}            TCP port listening on, or 0.
## {tls-port}        TLS port listening on, or 0.
## {unixsocket}      Unix domain socket listening on, or "".
## {config-file}     Name of configuration file used.
##
proc-title-template "{title} {listen-addr} {server-mode}"
## BEGIN MEIZHAOHUI COMMENTS
##   设置Redis进程的标题模板，保持默认值
## END MEIZHAOHUI COMMENTS

################################# SNAPSHOTTING  ################################

## Save the DB to disk.
##
## save <seconds> <changes>
##
## Redis will save the DB if both the given number of seconds and the given
## number of write operations against the DB occurred.
##
## Snapshotting can be completely disabled with a single empty string argument
## as in following example:
##
## save ""
##
## Unless specified otherwise, by default Redis will save the DB:
##   * After 3600 seconds (an hour) if at least 1 key changed
##   * After 300 seconds (5 minutes) if at least 100 keys changed
##   * After 60 seconds if at least 10000 keys changed
##
## You can set these explicitly by uncommenting the three following lines.
##
## save 3600 1
## save 300 100
## save 60 10000

## BEGIN MEIZHAOHUI COMMENTS
##   在Redis 6.2.14中，save配置指令已经被弃用，并在新版本中被移除。
##   Redis 6.0之前的版本使用save指令来配置在特定的时间间隔内执行数据集的持久化操作。
##   然而，这种方式是同步的，会阻塞服务器进程，因此不推荐在生产环境中使用。
##
##   在Redis 6.0及以上版本，持久化操作采用了新的默认配置，通过RDB和AOF来进行数据的持久化。
##   RDB是定时的数据快照，AOF是追加日志形式的持久化方式，它可以提供更好的持久化保证。
## END MEIZHAOHUI COMMENTS

## By default Redis will stop accepting writes if RDB snapshots are enabled
## (at least one save point) and the latest background save failed.
## This will make the user aware (in a hard way) that data is not persisting
## on disk properly, otherwise chances are that no one will notice and some
## disaster will happen.
##
## If the background saving process will start working again Redis will
## automatically allow writes again.
##
## However if you have setup your proper monitoring of the Redis server
## and persistence, you may want to disable this feature so that Redis will
## continue to work as usual even if there are problems with disk,
## permissions, and so forth.
stop-writes-on-bgsave-error yes

## BEGIN MEIZHAOHUI COMMENTS
##   stop-writes-on-bgsave-error 配置项是Redis的一个配置选项，用于控制当后台保存（RDB持久化）出现错误时，是否停止接收写操作。
##   如果设置为yes，则当后台保存进程因为某些错误（例如磁盘空间不足）无法执行时，Redis将停止接收写操作以避免数据不一致。
##   如果设置为no，即使后台保存失败，Redis也将继续处理写操作。
##   我们使用默认值，Redis在后台保存出错时停止写操作。
## END MEIZHAOHUI COMMENTS

## Compress string objects using LZF when dump .rdb databases?
## By default compression is enabled as it's almost always a win.
## If you want to save some CPU in the saving child set it to 'no' but
## the dataset will likely be bigger if you have compressible values or keys.
rdbcompression yes
## BEGIN MEIZHAOHUI COMMENTS
##   是否开启RDB文件压缩。
##   RDB文件压缩是Redis的一个优化特性，它可以显著减少RDB文件的大小，从而减少磁盘I/O操作，进而提升Redis的性能。
## END MEIZHAOHUI COMMENTS

## Since version 5 of RDB a CRC64 checksum is placed at the end of the file.
## This makes the format more resistant to corruption but there is a performance
## hit to pay (around 10%) when saving and loading RDB files, so you can disable it
## for maximum performances.
##
## RDB files created with checksum disabled have a checksum of zero that will
## tell the loading code to skip the check.
rdbchecksum yes
## BEGIN MEIZHAOHUI COMMENTS
##   是否开启RDB文件数据校验。
##   Redis 6.2.14 引入了 RDB 文件的校验和功能，以确保数据的一致性和完整性。
##   这是通过在 RDB 文件的末尾添加一个 8 字节的校验和来实现的。
##   当 Redis 加载 RDB 文件时，它会计算文件的校验和，并与文件末尾的校验和进行比较，以验证文件的完整性。
## END MEIZHAOHUI COMMENTS

## Enables or disables full sanitation checks for ziplist and listpack etc when
## loading an RDB or RESTORE payload. This reduces the chances of a assertion or
## crash later on while processing commands.
## Options:
##   no         - Never perform full sanitation
##   yes        - Always perform full sanitation
##   clients    - Perform full sanitation only for user connections.
##                Excludes: RDB files, RESTORE commands received from the master
##                connection, and client connections which have the
##                skip-sanitize-payload ACL flag.
## The default should be 'clients' but since it currently affects cluster
## resharding via MIGRATE, it is temporarily set to 'no' by default.
##
## sanitize-dump-payload no
## BEGIN MEIZHAOHUI COMMENTS
##   sanitize-dump-payload配置项是用来在使用RDB持久化时，对数据进行清理和/或转换的。
##   当sanitize-dump-payload设置为yes时，Redis会尝试去除RDB文件中的一些不安全的payload，
##   如果它们不能被直接去除，它们将被替换为安全的值。
##   需要注意的是，这个配置项可能会对数据导入性能产生影响，因此在生产环境中使用时需要谨慎考虑。
## END MEIZHAOHUI COMMENTS

## The filename where to dump the DB
dbfilename dump.rdb
## BEGIN MEIZHAOHUI COMMENTS
##   数据库文件名，也就是RDB持久化时Dump文件的名字。
##   保持默认即可。
## END MEIZHAOHUI COMMENTS

## Remove RDB files used by replication in instances without persistence
## enabled. By default this option is disabled, however there are environments
## where for regulations or other security concerns, RDB files persisted on
## disk by masters in order to feed replicas, or stored on disk by replicas
## in order to load them for the initial synchronization, should be deleted
## ASAP. Note that this option ONLY WORKS in instances that have both AOF
## and RDB persistence disabled, otherwise is completely ignored.
##
## An alternative (and sometimes better) way to obtain the same effect is
## to use diskless replication on both master and replicas instances. However
## in the case of replicas, diskless is not always an option.
rdb-del-sync-files no
## BEGIN MEIZHAOHUI COMMENTS
##   删除未启用持久性的实例中复制所使用的 RDB 文件。
##   请注意，此选项仅适用于同时禁用 AOF 和 RDB 持久性的实例，否则将被完全忽略。
##   保持默认即可。
## END MEIZHAOHUI COMMENTS


## The working directory.
##
## The DB will be written inside this directory, with the filename specified
## above using the 'dbfilename' configuration directive.
##
## The Append Only File will also be created inside this directory.
##
## Note that you must specify a directory here, not a file name.
## dir ./
## BEGIN MEIZHAOHUI COMMENTS
##   dir配置指的是Redis工作目录，用于存储持久化的数据文件和日志文件等。
##   我们将数据文件单独存放到 /srv/redis/data 目录下
## END MEIZHAOHUI COMMENTS
dir /srv/redis/data

################################## REPLICATION #################################

## Master-Replica replication. Use replicaof to make a Redis instance a copy of
## another Redis server. A few things to understand ASAP about Redis replication.
##
##   +------------------+      +---------------+
##   |      Master      | ---> |    Replica    |
##   | (receive writes) |      |  (exact copy) |
##   +------------------+      +---------------+
##
## 1) Redis replication is asynchronous, but you can configure a master to
##    stop accepting writes if it appears to be not connected with at least
##    a given number of replicas.
## 2) Redis replicas are able to perform a partial resynchronization with the
##    master if the replication link is lost for a relatively small amount of
##    time. You may want to configure the replication backlog size (see the next
##    sections of this file) with a sensible value depending on your needs.
## 3) Replication is automatic and does not need user intervention. After a
##    network partition replicas automatically try to reconnect to masters
##    and resynchronize with them.
##
## replicaof <masterip> <masterport>
## BEGIN MEIZHAOHUI COMMENTS
##   关于 Redis 复制，有几件事需要尽快了解。
##   1) Redis 复制是异步的，但您可以配置主服务器，如果它似乎与至少给定数量的副本没有连接，则停止接受写入。
##   2) 如果复制链接在相对较短的时间内丢失，Redis 副本能够与主服务器执行部分重新同步。您可能需要根据需要使用合理的值配置复制积压大小。
##   3) 复制是自动的，不需要用户干预。在网络断开后，副本会自动尝试重新连接到主服务器，并与它们重新同步。
##
##   replicaof指令被用于将当前的Redis服务器实例配置为另一个Redis服务器实例的复制品。
##   这是一个主从复制的配置选项，通常在Redis的配置文件中设置。
## END MEIZHAOHUI COMMENTS


## If the master is password protected (using the "requirepass" configuration
## directive below) it is possible to tell the replica to authenticate before
## starting the replication synchronization process, otherwise the master will
## refuse the replica request.
##
## masterauth <master-password>
##
## BEGIN MEIZHAOHUI COMMENTS
##   masterauth配置指令用于设置连接到主节点（如果Redis实例是复制的从节点）时所需的密码。
##   主从配置时，从节点需要配置该参数。
## END MEIZHAOHUI COMMENTS

##
## However this is not enough if you are using Redis ACLs (for Redis version
## 6 or greater), and the default user is not capable of running the PSYNC
## command and/or other commands needed for replication. In this case it's
## better to configure a special user to use with replication, and specify the
## masteruser configuration as such:
##
## masteruser <username>
##
## BEGIN MEIZHAOHUI COMMENTS
##   masteruser 用来指定主节点使用的用户。Redis 6或以上版本才支持ACL控制。
## END MEIZHAOHUI COMMENTS


##
## When masteruser is specified, the replica will authenticate against its
## master using the new AUTH form: AUTH <username> <password>.

## When a replica loses its connection with the master, or when the replication
## is still in progress, the replica can act in two different ways:
##
## 1) if replica-serve-stale-data is set to 'yes' (the default) the replica will
##    still reply to client requests, possibly with out of date data, or the
##    data set may just be empty if this is the first synchronization.
##
## 2) If replica-serve-stale-data is set to 'no' the replica will reply with
##    an error "SYNC with master in progress" to all commands except:
##    INFO, REPLICAOF, AUTH, PING, SHUTDOWN, REPLCONF, ROLE, CONFIG, SUBSCRIBE,
##    UNSUBSCRIBE, PSUBSCRIBE, PUNSUBSCRIBE, PUBLISH, PUBSUB, COMMAND, POST,
##    HOST and LATENCY.
##
replica-serve-stale-data yes
## BEGIN MEIZHAOHUI COMMENTS
##   replica-serve-stale-data配置选项用于控制副本节点在没有可用的主节点时的行为。
##   当设置为yes时，副本会继续响应客户端请求，尽管它可能没有从主节点接收到最新的数据。
##   当设置为no时，除了指定的命令之外，副本会对所有请求返回错误"SYNC with master in progress"。
##   保持默认即可。
## END MEIZHAOHUI COMMENTS


## You can configure a replica instance to accept writes or not. Writing against
## a replica instance may be useful to store some ephemeral data (because data
## written on a replica will be easily deleted after resync with the master) but
## may also cause problems if clients are writing to it because of a
## misconfiguration.
##
## Since Redis 2.6 by default replicas are read-only.
##
## Note: read only replicas are not designed to be exposed to untrusted clients
## on the internet. It's just a protection layer against misuse of the instance.
## Still a read only replica exports by default all the administrative commands
## such as CONFIG, DEBUG, and so forth. To a limited extent you can improve
## security of read only replicas using 'rename-command' to shadow all the
## administrative / dangerous commands.
replica-read-only yes
## BEGIN MEIZHAOHUI COMMENTS
##   副本只读。
## END MEIZHAOHUI COMMENTS

## Replication SYNC strategy: disk or socket.
##
## New replicas and reconnecting replicas that are not able to continue the
## replication process just receiving differences, need to do what is called a
## "full synchronization". An RDB file is transmitted from the master to the
## replicas.
##
## The transmission can happen in two different ways:
##
## 1) Disk-backed: The Redis master creates a new process that writes the RDB
##                 file on disk. Later the file is transferred by the parent
##                 process to the replicas incrementally.
## 2) Diskless: The Redis master creates a new process that directly writes the
##              RDB file to replica sockets, without touching the disk at all.
##
## With disk-backed replication, while the RDB file is generated, more replicas
## can be queued and served with the RDB file as soon as the current child
## producing the RDB file finishes its work. With diskless replication instead
## once the transfer starts, new replicas arriving will be queued and a new
## transfer will start when the current one terminates.
##
## When diskless replication is used, the master waits a configurable amount of
## time (in seconds) before starting the transfer in the hope that multiple
## replicas will arrive and the transfer can be parallelized.
##
## With slow disks and fast (large bandwidth) networks, diskless replication
## works better.
repl-diskless-sync no
## BEGIN MEIZHAOHUI COMMENTS
##   是否使用socket方式复制数据(无盘同步)，新slave连接连接时候需要做数据的全量同步，
##   redis server就要从内存dump出新的RDB文件，然后从master传到slave，有两种方式把RDB文件传输给客户端：
##   1) 基于硬盘（disk-backed）：master创建一个新进程dump RDB，RDB完成之后由父进程（即主进程）传给slaves。
##   2) 基于socket（diskless）： master创建一个新进程直接dump RDB到slave的socket，不经过主进程，不经过硬盘。
##   基于硬盘的话，RDB文件创建后，一旦创建完毕，可以同时服务更多的slave，
##   但是基于socket的话， 新slave连接到master之后得逐个同步数据。
##   在磁盘较慢并且网络较快的时候，可以用diskless(yes),否则使用磁盘(no)。
##   保持默认即可。
## END MEIZHAOHUI COMMENTS


## When diskless replication is enabled, it is possible to configure the delay
## the server waits in order to spawn the child that transfers the RDB via socket
## to the replicas.
##
## This is important since once the transfer starts, it is not possible to serve
## new replicas arriving, that will be queued for the next RDB transfer, so the
## server waits a delay in order to let more replicas arrive.
##
## The delay is specified in seconds, and by default is 5 seconds. To disable
## it entirely just set it to 0 seconds and the transfer will start ASAP.
repl-diskless-sync-delay 5
## BEGIN MEIZHAOHUI COMMENTS
##   diskless复制的延迟时间，设置0为关闭，在延迟时间内连接的新客户端，会一起通过disk方式同步数据，
##   但是一旦复制开始还没有结束之前，master节点不会再接收新slave的复制请求，直到下一次同步开始。
##   保持默认即可。
##   repl-diskless-sync no 使用磁盘复制数据时，这个配置无用。
## END MEIZHAOHUI COMMENTS


## -----------------------------------------------------------------------------
## WARNING: RDB diskless load is experimental. Since in this setup the replica
## does not immediately store an RDB on disk, it may cause data loss during
## failovers. RDB diskless load + Redis modules not handling I/O reads may also
## cause Redis to abort in case of I/O errors during the initial synchronization
## stage with the master. Use only if you know what you are doing.
## -----------------------------------------------------------------------------
##
## Replica can load the RDB it reads from the replication link directly from the
## socket, or store the RDB to a file and read that file after it was completely
## received from the master.
##
## In many cases the disk is slower than the network, and storing and loading
## the RDB file may increase replication time (and even increase the master's
## Copy on Write memory and salve buffers).
## However, parsing the RDB file directly from the socket may mean that we have
## to flush the contents of the current database before the full rdb was
## received. For this reason we have the following options:
##
## "disabled"    - Don't use diskless load (store the rdb file to the disk first)
## "on-empty-db" - Use diskless load only when it is completely safe.
## "swapdb"      - Keep a copy of the current db contents in RAM while parsing
##                 the data directly from the socket. note that this requires
##                 sufficient memory, if you don't have it, you risk an OOM kill.
repl-diskless-load disabled
## BEGIN MEIZHAOHUI COMMENTS
##   repl-diskless-load选项是用来控制无盘复制（diskless replication）功能的启用与否。
##   如果启用，则意味着当主服务器进行数据同步时，可以不将数据写入磁盘文件，而是通过网络直接发送给从服务器。
##   这可以提高数据同步的效率，减少磁盘I/O的开销。
##   默认不启用。保持默认即可。
## END MEIZHAOHUI COMMENTS


## Replicas send PINGs to server in a predefined interval. It's possible to
## change this interval with the repl_ping_replica_period option. The default
## value is 10 seconds.
##
## repl-ping-replica-period 10
## BEGIN MEIZHAOHUI COMMENTS
##   副本多长时间向向主节点发送一次PING请求
##   默认10秒。保持默认即可。
## END MEIZHAOHUI COMMENTS

## The following option sets the replication timeout for:
##
## 1) Bulk transfer I/O during SYNC, from the point of view of replica.
## 2) Master timeout from the point of view of replicas (data, pings).
## 3) Replica timeout from the point of view of masters (REPLCONF ACK pings).
##
## It is important to make sure that this value is greater than the value
## specified for repl-ping-replica-period otherwise a timeout will be detected
## every time there is low traffic between the master and the replica. The default
## value is 60 seconds.
##
## repl-timeout 60
## BEGIN MEIZHAOHUI COMMENTS
##   复制连接的超时时间，需要大于repl-ping-slave-period，否则会经常报超时。
##   默认60秒。保持默认即可。
## END MEIZHAOHUI COMMENTS

## Disable TCP_NODELAY on the replica socket after SYNC?
##
## If you select "yes" Redis will use a smaller number of TCP packets and
## less bandwidth to send data to replicas. But this can add a delay for
## the data to appear on the replica side, up to 40 milliseconds with
## Linux kernels using a default configuration.
##
## If you select "no" the delay for data to appear on the replica side will
## be reduced but more bandwidth will be used for replication.
##
## By default we optimize for low latency, but in very high traffic conditions
## or when the master and replicas are many hops away, turning this to "yes" may
## be a good idea.
repl-disable-tcp-nodelay no
## BEGIN MEIZHAOHUI COMMENTS
##   在socket模式下是否在slave套接字发送SYNC之后禁用 TCP_NODELAY。
##   由于不使用socket模式。保持默认即可。
## END MEIZHAOHUI COMMENTS


## Set the replication backlog size. The backlog is a buffer that accumulates
## replica data when replicas are disconnected for some time, so that when a
## replica wants to reconnect again, often a full resync is not needed, but a
## partial resync is enough, just passing the portion of data the replica
## missed while disconnected.
##
## The bigger the replication backlog, the longer the replica can endure the
## disconnect and later be able to perform a partial resynchronization.
##
## The backlog is only allocated if there is at least one replica connected.
##
## repl-backlog-size 1mb
## BEGIN MEIZHAOHUI COMMENTS
##   复制缓冲区内存大小，只有在slave连接之后才分配内存。
##   请注意，设置的repl-backlog-size值不能超过主服务器的可用内存。
##   在实际操作中，应当根据实际需求和服务器的内存容量来设置这个值。
##   如果复制延迟严重，可以考虑增加这个值。
##   如果主服务器数据变化不频繁，可以减少这个值来节省内存。
##   保持默认即可。
## END MEIZHAOHUI COMMENTS


## After a master has no connected replicas for some time, the backlog will be
## freed. The following option configures the amount of seconds that need to
## elapse, starting from the time the last replica disconnected, for the backlog
## buffer to be freed.
##
## Note that replicas never free the backlog for timeout, since they may be
## promoted to masters later, and should be able to correctly "partially
## resynchronize" with other replicas: hence they should always accumulate backlog.
##
## A value of 0 means to never release the backlog.
##
## repl-backlog-ttl 3600
## BEGIN MEIZHAOHUI COMMENTS
##   多长时间master没有slave连接，就清空复制缓冲区内存。
##   默认3600秒。
##   保持默认即可。
## END MEIZHAOHUI COMMENTS

## The replica priority is an integer number published by Redis in the INFO
## output. It is used by Redis Sentinel in order to select a replica to promote
## into a master if the master is no longer working correctly.
##
## A replica with a low priority number is considered better for promotion, so
## for instance if there are three replicas with priority 10, 100, 25 Sentinel
## will pick the one with priority 10, that is the lowest.
##
## However a special priority of 0 marks the replica as not able to perform the
## role of master, so a replica with priority of 0 will never be selected by
## Redis Sentinel for promotion.
##
## By default the priority is 100.
replica-priority 100
## BEGIN MEIZHAOHUI COMMENTS
##   当master不可用，Sentinel会根据slave的优先级选举一个master，
##   最低的优先级的slave，当选master。
##   即值小的节点当前新的master。
##   而配置成0，永远不会被选举。
##   保持默认即可。
##   如果配置成哨兵模式，可以适当修改从节点的优先级值。
## END MEIZHAOHUI COMMENTS

## -----------------------------------------------------------------------------
## By default, Redis Sentinel includes all replicas in its reports. A replica
## can be excluded from Redis Sentinel's announcements. An unannounced replica
## will be ignored by the 'sentinel replicas <master>' command and won't be
## exposed to Redis Sentinel's clients.
##
## This option does not change the behavior of replica-priority. Even with
## replica-announced set to 'no', the replica can be promoted to master. To
## prevent this behavior, set replica-priority to 0.
##
## replica-announced yes
## BEGIN MEIZHAOHUI COMMENTS
##   默认情况下，Redis Sentinel 在其报告中包括所有副本。
##   副本可以从 Redis Sentinel 的公告中排除。
##   未公告的副本将被"sentinel replicas <master>"命令忽略，
##   并且不会暴露给 Redis Sentinel 的客户端。
##
##   保持默认即可。
##   此配置不会改变从节点的选举行为，即使replica-announced no ，这个节点也可以提升为主节点。
##   要禁止该节点提升为主节点，应配置replica-priority 0 不参入选举。
## END MEIZHAOHUI COMMENTS


## It is possible for a master to stop accepting writes if there are less than
## N replicas connected, having a lag less or equal than M seconds.
##
## The N replicas need to be in "online" state.
##
## The lag in seconds, that must be <= the specified value, is calculated from
## the last ping received from the replica, that is usually sent every second.
##
## This option does not GUARANTEE that N replicas will accept the write, but
## will limit the window of exposure for lost writes in case not enough replicas
## are available, to the specified number of seconds.
##
## For example to require at least 3 replicas with a lag <= 10 seconds use:
##
## min-replicas-to-write 3
## min-replicas-max-lag 10
##
## Setting one or the other to 0 disables the feature.
##
## By default min-replicas-to-write is set to 0 (feature disabled) and
## min-replicas-max-lag is set to 10.

## BEGIN MEIZHAOHUI COMMENTS
##   如果连接的副本少于 N 个，且延迟小于或等于 M 秒，则主服务器可能会停止接受写入。
##   N 个副本需要处于"在线"状态。
##   延迟（以秒为单位），必须小于等于指定值，
##   是根据从副本收到的最后一个 ping 计算得出的，通常每秒发送一次。
##   至少有3个可连接的slave，master才接受写操作。
##   3个slave的ping延迟不能超过10秒，否则master也将停止写操作。
##   如果集群本来就只有3个节点，可以考虑减少min-replicas-to-write的值，
##   比如设置为1，这样即使只有一个副本，主节点也会进行数据持久化。
##   默认情况下，禁用了该特性。
## END MEIZHAOHUI COMMENTS



## A Redis master is able to list the address and port of the attached
## replicas in different ways. For example the "INFO replication" section
## offers this information, which is used, among other tools, by
## Redis Sentinel in order to discover replica instances.
## Another place where this info is available is in the output of the
## "ROLE" command of a master.
##
## The listed IP address and port normally reported by a replica is
## obtained in the following way:
##
##   IP: The address is auto detected by checking the peer address
##   of the socket used by the replica to connect with the master.
##
##   Port: The port is communicated by the replica during the replication
##   handshake, and is normally the port that the replica is using to
##   listen for connections.
##
## However when port forwarding or Network Address Translation (NAT) is
## used, the replica may actually be reachable via different IP and port
## pairs. The following two options can be used by a replica in order to
## report to its master a specific set of IP and port, so that both INFO
## and ROLE will report those values.
##
## There is no need to use both the options if you need to override just
## the port or the IP address.
##
## replica-announce-ip 5.5.5.5
## replica-announce-port 1234
## BEGIN MEIZHAOHUI COMMENTS
##   配置通告的IP和端口信息，我们不单独设置。
## END MEIZHAOHUI COMMENTS

################################ KEYS TRACKING #################################

## Redis implements server assisted support for client side caching of values.
## This is implemented using an invalidation table that remembers, using
## a radix key indexed by key name, what clients have which keys. In turn
## this is used in order to send invalidation messages to clients. Please
## check this page to understand more about the feature:
##
##   https://redis.io/topics/client-side-caching
##
## When tracking is enabled for a client, all the read only queries are assumed
## to be cached: this will force Redis to store information in the invalidation
## table. When keys are modified, such information is flushed away, and
## invalidation messages are sent to the clients. However if the workload is
## heavily dominated by reads, Redis could use more and more memory in order
## to track the keys fetched by many clients.
##
## For this reason it is possible to configure a maximum fill value for the
## invalidation table. By default it is set to 1M of keys, and once this limit
## is reached, Redis will start to evict keys in the invalidation table
## even if they were not modified, just to reclaim memory: this will in turn
## force the clients to invalidate the cached values. Basically the table
## maximum size is a trade off between the memory you want to spend server
## side to track information about who cached what, and the ability of clients
## to retain cached objects in memory.
##
## If you set the value to 0, it means there are no limits, and Redis will
## retain as many keys as needed in the invalidation table.
## In the "stats" INFO section, you can find information about the number of
## keys in the invalidation table at every given moment.
##
## Note: when key tracking is used in broadcasting mode, no memory is used
## in the server side so this setting is useless.
##
## tracking-table-max-keys 1000000
## BEGIN MEIZHAOHUI COMMENTS
##   配置追踪表（tracking table）的最大键数量的。
##   追踪表是Redis用来记录键空间通知事件的内存结构，这些事件可以是键的添加、删除或者过期等。
##   保持默认即可。
## END MEIZHAOHUI COMMENTS

################################### SECURITY ###################################

## Warning: since Redis is pretty fast, an outside user can try up to
## 1 million passwords per second against a modern box. This means that you
## should use very strong passwords, otherwise they will be very easy to break.
## Note that because the password is really a shared secret between the client
## and the server, and should not be memorized by any human, the password
## can be easily a long string from /dev/urandom or whatever, so by using a
## long and unguessable password no brute force attack will be possible.

## Redis ACL users are defined in the following format:
##
##   user <username> ... acl rules ...
##
## For example:
##
##   user worker +@list +@connection ~jobs:* on >ffa9203c493aa99
##
## The special username "default" is used for new connections. If this user
## has the "nopass" rule, then new connections will be immediately authenticated
## as the "default" user without the need of any password provided via the
## AUTH command. Otherwise if the "default" user is not flagged with "nopass"
## the connections will start in not authenticated state, and will require
## AUTH (or the HELLO command AUTH option) in order to be authenticated and
## start to work.
## BEGIN MEIZHAOHUI COMMENTS
##   警告：由于 Redis 速度非常快，外部用户每秒最多可以尝试 100 万个密码来破解现代机器。
##   这意味着您应该使用非常强的密码，否则它们将很容易被破解。
##   请注意，由于密码实际上是客户端和服务器之间的共享秘密，不应被任何人记住，
##   因此密码很容易是来自 /dev/urandom 或其他任何东西的长字符串，
##   因此通过使用长且不可猜测的密码，不可能进行暴力攻击。
## END MEIZHAOHUI COMMENTS


##
## The ACL rules that describe what a user can do are the following:
##
##  on           Enable the user: it is possible to authenticate as this user.
##  off          Disable the user: it's no longer possible to authenticate
##               with this user, however the already authenticated connections
##               will still work.
##  skip-sanitize-payload    RESTORE dump-payload sanitation is skipped.
##  sanitize-payload         RESTORE dump-payload is sanitized (default).
##  +<command>   Allow the execution of that command
##  -<command>   Disallow the execution of that command
##  +@<category> Allow the execution of all the commands in such category
##               with valid categories are like @admin, @set, @sortedset, ...
##               and so forth, see the full list in the server.c file where
##               the Redis command table is described and defined.
##               The special category @all means all the commands, but currently
##               present in the server, and that will be loaded in the future
##               via modules.
##  +<command>|subcommand    Allow a specific subcommand of an otherwise
##                           disabled command. Note that this form is not
##                           allowed as negative like -DEBUG|SEGFAULT, but
##                           only additive starting with "+".
##  allcommands  Alias for +@all. Note that it implies the ability to execute
##               all the future commands loaded via the modules system.
##  nocommands   Alias for -@all.
##  ~<pattern>   Add a pattern of keys that can be mentioned as part of
##               commands. For instance ~* allows all the keys. The pattern
##               is a glob-style pattern like the one of KEYS.
##               It is possible to specify multiple patterns.
##  allkeys      Alias for ~*
##  resetkeys    Flush the list of allowed keys patterns.
##  &<pattern>   Add a glob-style pattern of Pub/Sub channels that can be
##               accessed by the user. It is possible to specify multiple channel
##               patterns.
##  allchannels  Alias for &*
##  resetchannels            Flush the list of allowed channel patterns.
##  ><password>  Add this password to the list of valid password for the user.
##               For example >mypass will add "mypass" to the list.
##               This directive clears the "nopass" flag (see later).
##  <<password>  Remove this password from the list of valid passwords.
##  nopass       All the set passwords of the user are removed, and the user
##               is flagged as requiring no password: it means that every
##               password will work against this user. If this directive is
##               used for the default user, every new connection will be
##               immediately authenticated with the default user without
##               any explicit AUTH command required. Note that the "resetpass"
##               directive will clear this condition.
##  resetpass    Flush the list of allowed passwords. Moreover removes the
##               "nopass" status. After "resetpass" the user has no associated
##               passwords and there is no way to authenticate without adding
##               some password (or setting it as "nopass" later).
##  reset        Performs the following actions: resetpass, resetkeys, off,
##               -@all. The user returns to the same state it has immediately
##               after its creation.
##
## ACL rules can be specified in any order: for instance you can start with
## passwords, then flags, or key patterns. However note that the additive
## and subtractive rules will CHANGE MEANING depending on the ordering.
## For instance see the following example:
##
##   user alice on +@all -DEBUG ~* >somepassword
##
## This will allow "alice" to use all the commands with the exception of the
## DEBUG command, since +@all added all the commands to the set of the commands
## alice can use, and later DEBUG was removed. However if we invert the order
## of two ACL rules the result will be different:
##
##   user alice on -DEBUG +@all ~* >somepassword
##
## Now DEBUG was removed when alice had yet no commands in the set of allowed
## commands, later all the commands are added, so the user will be able to
## execute everything.
##
## Basically ACL rules are processed left-to-right.
##
## For more information about ACL configuration please refer to
## the Redis web site at https://redis.io/topics/acl

## ACL LOG
##
## The ACL Log tracks failed commands and authentication events associated
## with ACLs. The ACL Log is useful to troubleshoot failed commands blocked 
## by ACLs. The ACL Log is stored in memory. You can reclaim memory with 
## ACL LOG RESET. Define the maximum entry length of the ACL Log below.
acllog-max-len 128
## BEGIN MEIZHAOHUI COMMENTS
##   acllog-max-len配置项用于设置ACL日志的最大长度。
##   ACL日志记录了所有的访问控制列表(ACL)相关的命令执行历史。
##   当ACL日志记录数据超过了acllog-max-len配置的长度时，旧的记录会被移除。
## END MEIZHAOHUI COMMENTS


## Using an external ACL file
##
## Instead of configuring users here in this file, it is possible to use
## a stand-alone file just listing users. The two methods cannot be mixed:
## if you configure users here and at the same time you activate the external
## ACL file, the server will refuse to start.
##
## The format of the external ACL user file is exactly the same as the
## format that is used inside redis.conf to describe users.
##
## aclfile /etc/redis/users.acl
## BEGIN MEIZHAOHUI COMMENTS
##   使用外部 ACL 文件。aclfile配置用来设置外部ACL文件路径。
##   除了在此文件中配置用户之外，还可以使用# 仅列出用户的独立文件。
##   这两种方法不能混合使用：
##   如果您在此配置用户，同时激活外部ACL 文件，服务器将拒绝启动。
##
##  外部 ACL 用户文件的格式与 redis.conf 中用于描述用户的格式完全相同。
##  保持默认即可。不启动ACL文件。
## END MEIZHAOHUI COMMENTS

## IMPORTANT NOTE: starting with Redis 6 "requirepass" is just a compatibility
## layer on top of the new ACL system. The option effect will be just setting
## the password for the default user. Clients will still authenticate using
## AUTH <password> as usually, or more explicitly with AUTH default <password>
## if they follow the new protocol: both will work.
##
## The requirepass is not compatable with aclfile option and the ACL LOAD
## command, these will cause requirepass to be ignored.
##
## requirepass foobared
## BEGIN MEIZHAOHUI COMMENTS
##   重要提示：从 Redis 6 开始，"requirepass"只是新 ACL 系统之上的兼容层。
##   该选项的效果只是设置默认用户的密码。
##   客户端仍将像往常一样使用 AUTH <password> 进行身份验证，
##   或者更明确地使用 AUTH default <password> 进行身份验证，
##   如果它们遵循新协议：两者都可以工作。
##
##   requirepass 与 aclfile 选项和 ACL LOAD 命令不兼容，
##   这些将导致 requirepass 被忽略。
##
## 请注意，出于安全考虑，应确保密码足够复杂，并在生产环境中使用复杂的安全措施来保护密码。
## END MEIZHAOHUI COMMENTS
requirepass ALONGPASSWORD

## New users are initialized with restrictive permissions by default, via the
## equivalent of this ACL rule 'off resetkeys -@all'. Starting with Redis 6.2, it
## is possible to manage access to Pub/Sub channels with ACL rules as well. The
## default Pub/Sub channels permission if new users is controlled by the 
## acl-pubsub-default configuration directive, which accepts one of these values:
##
## allchannels: grants access to all Pub/Sub channels
## resetchannels: revokes access to all Pub/Sub channels
##
## To ensure backward compatibility while upgrading Redis 6.0, acl-pubsub-default
## defaults to the 'allchannels' permission.
##
## Future compatibility note: it is very likely that in a future version of Redis
## the directive's default of 'allchannels' will be changed to 'resetchannels' in
## order to provide better out-of-the-box Pub/Sub security. Therefore, it is
## recommended that you explicitly define Pub/Sub permissions for all users
## rather then rely on implicit default values. Once you've set explicit
## Pub/Sub for all existing users, you should uncomment the following line.
##
## acl-pubsub-default resetchannels

## Command renaming (DEPRECATED).
##
## ------------------------------------------------------------------------
## WARNING: avoid using this option if possible. Instead use ACLs to remove
## commands from the default user, and put them only in some admin user you
## create for administrative purposes.
## ------------------------------------------------------------------------
##
## It is possible to change the name of dangerous commands in a shared
## environment. For instance the CONFIG command may be renamed into something
## hard to guess so that it will still be available for internal-use tools
## but not available for general clients.
##

## BEGIN MEIZHAOHUI COMMENTS
##   可以在共享环境中更改危险命令的名称,暂时不设置。
## END MEIZHAOHUI COMMENTS
## Example:
##
## rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
##
## It is also possible to completely kill a command by renaming it into
## an empty string:
##
## rename-command CONFIG ""
##
## Please note that changing the name of commands that are logged into the
## AOF file or transmitted to replicas may cause problems.

#################################### CLIENTS ####################################

## Set the max number of connected clients at the same time. By default
## this limit is set to 10000 clients, however if the Redis server is not
## able to configure the process file limit to allow for the specified limit
## the max number of allowed clients is set to the current file limit
## minus 32 (as Redis reserves a few file descriptors for internal uses).
##
## Once the limit is reached Redis will close all the new connections sending
## an error 'max number of clients reached'.
##
## IMPORTANT: When Redis Cluster is used, the max number of connections is also
## shared with the cluster bus: every node in the cluster will use two
## connections, one incoming and another outgoing. It is important to size the
## limit accordingly in case of very large clusters.
##
## maxclients 10000
## BEGIN MEIZHAOHUI COMMENTS
##   设置同时连接的最大客户端数量。
##   默认情况下，此限制设置为 10000 个客户端。
##   但是如果 Redis 服务器无法配置进程文件限制以允许指定的限制，
##   则允许的最大客户端数量将设置为当前文件限制减 32（因为 Redis 保留了一些文件描述符供内部使用）。
##
##   一旦达到限制，Redis 将关闭所有新连接并发送错误"已达到最大客户端数量"。
##
##   重要提示：使用 Redis 集群时，最大连接数也与集群总线共享：
##   集群中的每个节点都将使用两个连接，一个传入，另一个传出。
##   如果集群非常大，则必须相应地调整限制的大小。
##   我们不单独设置。
## END MEIZHAOHUI COMMENTS

############################### MEMORY MANAGEMENT ################################

## Set a memory usage limit to the specified amount of bytes.
## When the memory limit is reached Redis will try to remove keys
## according to the eviction policy selected (see maxmemory-policy).
##
## If Redis can't remove keys according to the policy, or if the policy is
## set to 'noeviction', Redis will start to reply with errors to commands
## that would use more memory, like SET, LPUSH, and so on, and will continue
## to reply to read-only commands like GET.
##
## This option is usually useful when using Redis as an LRU or LFU cache, or to
## set a hard memory limit for an instance (using the 'noeviction' policy).
##
## WARNING: If you have replicas attached to an instance with maxmemory on,
## the size of the output buffers needed to feed the replicas are subtracted
## from the used memory count, so that network problems / resyncs will
## not trigger a loop where keys are evicted, and in turn the output
## buffer of replicas is full with DELs of keys evicted triggering the deletion
## of more keys, and so forth until the database is completely emptied.
##
## In short... if you have replicas attached it is suggested that you set a lower
## limit for maxmemory so that there is some free RAM on the system for replica
## output buffers (but this is not needed if the policy is 'noeviction').
##
## maxmemory <bytes>
## BEGIN MEIZHAOHUI COMMENTS
##   将内存使用限制设置为指定的字节数。
##   当达到内存限制时，Redis 将尝试根据所选的驱逐策略删除键（请参阅 maxmemory-policy）。
##
##   如果 Redis 无法根据策略删除键，或者策略设置为"noeviction"，
##   Redis 将开始以错误回复将使用更多内存的命令，例如 SET、LPUSH 等，并将继续回复只读命令，例如 GET。
##
##   此选项通常在将 Redis 用作 LRU 或 LFU 缓存时有用，或者在为实例设置硬内存限制时很有用（使用"noeviction"策略）。
##
##   警告：如果您将副本附加到启用了 maxmemory 的实例，
##   将从已用内存计数中减去提供副本所需的输出缓冲区大小，这样网络问题/重新同步就不会触发循环，导致键被逐出，
##   反过来，副本的输出缓冲区已满，被逐出的键的 DEL 触发了更多键的删除，依此类推，直到数据库完全清空。
##
##   简而言之……如果您附加了副本，建议您为 maxmemory 设置一个较低的限制，
##   以便系统上有一些可用于副本输出缓冲区的可用 RAM（但如果策略为"noeviction"，则不需要这样做）。
## END MEIZHAOHUI COMMENTS
maxmemory 1gb

## MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
## is reached. You can select one from the following behaviors:
##
## volatile-lru -> Evict using approximated LRU, only keys with an expire set.
## allkeys-lru -> Evict any key using approximated LRU.
## volatile-lfu -> Evict using approximated LFU, only keys with an expire set.
## allkeys-lfu -> Evict any key using approximated LFU.
## volatile-random -> Remove a random key having an expire set.
## allkeys-random -> Remove a random key, any key.
## volatile-ttl -> Remove the key with the nearest expire time (minor TTL)
## noeviction -> Don't evict anything, just return an error on write operations.
##
## LRU means Least Recently Used
## LFU means Least Frequently Used
##
## Both LRU, LFU and volatile-ttl are implemented using approximated
## randomized algorithms.
##
## Note: with any of the above policies, when there are no suitable keys for
## eviction, Redis will return an error on write operations that require
## more memory. These are usually commands that create new keys, add data or
## modify existing keys. A few examples are: SET, INCR, HSET, LPUSH, SUNIONSTORE,
## SORT (due to the STORE argument), and EXEC (if the transaction includes any
## command that requires memory).
##
## The default is:
##
## maxmemory-policy noeviction
## BEGIN MEIZHAOHUI COMMENTS
##   MAXMEMORY POLICY：达到 maxmemory 时，Redis 将如何选择要删除的内容。您可以从以下行为中选择一个：
##
##   volatile-lru -> 使用近似 LRU 驱逐，仅驱逐设置了过期时间的键。
##   allkeys-lru -> 使用近似 LRU 驱逐任何键。
##   volatile-lfu -> 使用近似 LFU 驱逐，仅驱逐设置了过期时间的键。
##   allkeys-lfu -> 使用近似 LFU 驱逐任何键。
##   volatile-random -> 删除设置了过期时间的随机键。
##   allkeys-random -> 删除随机键，任何键。
##   volatile-ttl -> 删除具有最近过期时间（次要 TTL）的键
##   noeviction -> 不驱逐任何内容，仅在写入操作时返回错误。
##
##   LRU 表示最近最少使用
##   LFU 表示最不频繁使用
##
##   LRU、LFU 和 volatile-ttl 都是使用近似随机算法实现的。
##
##   注意：对于上述任何一种策略，当没有适合驱逐的键时，Redis 将在需要更多内存的写入操作上返回错误。
##   这些通常是创建新键、添加数据或修改现有键的命令。
##   一些示例是：SET、INCR、HSET、LPUSH、SUNIONSTORE、SORT（由于 STORE 参数）和 EXEC（如果事务包含任何需要内存的命令）。
##   默认是 maxmemory-policy noeviction， 即不驱逐任何内容，仅在写入操作时返回错误。
## END MEIZHAOHUI COMMENTS


## LRU, LFU and minimal TTL algorithms are not precise algorithms but approximated
## algorithms (in order to save memory), so you can tune it for speed or
## accuracy. By default Redis will check five keys and pick the one that was
## used least recently, you can change the sample size using the following
## configuration directive.
##
## The default of 5 produces good enough results. 10 Approximates very closely
## true LRU but costs more CPU. 3 is faster but not very accurate.
##
## maxmemory-samples 5
## BEGIN MEIZHAOHUI COMMENTS
##   LRU、LFU 和最小 TTL 算法不是精确算法，而是近似算法（为了节省内存），
##   因此您可以调整速度或准确性。
##   默认情况下，Redis 将检查五个键并选择最近使用最少的键，您可以使用以下配置指令更改样本大小。
##
##   默认值 5 产生足够好的结果。10 非常接近真正的 LRU，但消耗更多 CPU。3 更快但不太准确。
##   因为未启用驱逐算法，此配置无作用。
##   我们保持默认 maxmemory-samples 5 即可。
## END MEIZHAOHUI COMMENTS

## Eviction processing is designed to function well with the default setting.
## If there is an unusually large amount of write traffic, this value may need to
## be increased.  Decreasing this value may reduce latency at the risk of 
## eviction processing effectiveness
##   0 = minimum latency, 10 = default, 100 = process without regard to latency
##
## maxmemory-eviction-tenacity 10
## BEGIN MEIZHAOHUI COMMENTS
##   设置移除容忍度。
##   数值越小表示容忍度越低，需要移除的数据移除延迟越小；
##   数值越大表示容忍度越高，需要移除的数据移除延迟越大。
##   如果写入流量异常大，则可能需要增加此值。
##   降低此值可能会降低延迟，但可能会降低驱逐处理效率
##   0 = 最小延迟，10 = 默认值，100 = 不考虑延迟的处理。
## END MEIZHAOHUI COMMENTS

## Starting from Redis 5, by default a replica will ignore its maxmemory setting
## (unless it is promoted to master after a failover or manually). It means
## that the eviction of keys will be just handled by the master, sending the
## DEL commands to the replica as keys evict in the master side.
##
## This behavior ensures that masters and replicas stay consistent, and is usually
## what you want, however if your replica is writable, or you want the replica
## to have a different memory setting, and you are sure all the writes performed
## to the replica are idempotent, then you may change this default (but be sure
## to understand what you are doing).
##
## Note that since the replica by default does not evict, it may end using more
## memory than the one set via maxmemory (there are certain buffers that may
## be larger on the replica, or data structures may sometimes take more memory
## and so forth). So make sure you monitor your replicas and make sure they
## have enough memory to never hit a real out-of-memory condition before the
## master hits the configured maxmemory setting.
##
## replica-ignore-maxmemory yes
## BEGIN MEIZHAOHUI COMMENTS
##   replica-ignore-maxmemor用于控制 Redis 副本（replica）在达到 maxmemory 限制时的行为。
##   当 replica-ignore-maxmemory 设置为 yes 时，副本会忽略 maxmemory 设置，
##   并允许内存持续增长超过 maxmemory 指定的限制。
##   这可能会导致副本的内存使用超过主服务器，并可能导致不一致的数据状态。
##
##   通常，这个选项应当设置为 no，以确保副本服务器的内存使用保持在安全的范围内。
## END MEIZHAOHUI COMMENTS


## Redis reclaims expired keys in two ways: upon access when those keys are
## found to be expired, and also in background, in what is called the
## "active expire key". The key space is slowly and interactively scanned
## looking for expired keys to reclaim, so that it is possible to free memory
## of keys that are expired and will never be accessed again in a short time.
##
## The default effort of the expire cycle will try to avoid having more than
## ten percent of expired keys still in memory, and will try to avoid consuming
## more than 25% of total memory and to add latency to the system. However
## it is possible to increase the expire "effort" that is normally set to
## "1", to a greater value, up to the value "10". At its maximum value the
## system will use more CPU, longer cycles (and technically may introduce
## more latency), and will tolerate less already expired keys still present
## in the system. It's a tradeoff between memory, CPU and latency.
##
## active-expire-effort 1
## BEGIN MEIZHAOHUI COMMENTS
##   active-expire-effort 配置指的是对过期键进行处理的活跃性工作量。
##   这个配置影响了Redis如何平衡CPU时间来处理过期键和其他任务，如持久化和命令处理。
##   值从1-10，值越大，占用CPU资源越多。
## END MEIZHAOHUI COMMENTS

############################## LAZY FREEING ####################################

## Redis has two primitives to delete keys. One is called DEL and is a blocking
## deletion of the object. It means that the server stops processing new commands
## in order to reclaim all the memory associated with an object in a synchronous
## way. If the key deleted is associated with a small object, the time needed
## in order to execute the DEL command is very small and comparable to most other
## O(1) or O(log_N) commands in Redis. However if the key is associated with an
## aggregated value containing millions of elements, the server can block for
## a long time (even seconds) in order to complete the operation.
##
## For the above reasons Redis also offers non blocking deletion primitives
## such as UNLINK (non blocking DEL) and the ASYNC option of FLUSHALL and
## FLUSHDB commands, in order to reclaim memory in background. Those commands
## are executed in constant time. Another thread will incrementally free the
## object in the background as fast as possible.
##
## DEL, UNLINK and ASYNC option of FLUSHALL and FLUSHDB are user-controlled.
## It's up to the design of the application to understand when it is a good
## idea to use one or the other. However the Redis server sometimes has to
## delete keys or flush the whole database as a side effect of other operations.
## Specifically Redis deletes objects independently of a user call in the
## following scenarios:
##
## 1) On eviction, because of the maxmemory and maxmemory policy configurations,
##    in order to make room for new data, without going over the specified
##    memory limit.
## 2) Because of expire: when a key with an associated time to live (see the
##    EXPIRE command) must be deleted from memory.
## 3) Because of a side effect of a command that stores data on a key that may
##    already exist. For example the RENAME command may delete the old key
##    content when it is replaced with another one. Similarly SUNIONSTORE
##    or SORT with STORE option may delete existing keys. The SET command
##    itself removes any old content of the specified key in order to replace
##    it with the specified string.
## 4) During replication, when a replica performs a full resynchronization with
##    its master, the content of the whole database is removed in order to
##    load the RDB file just transferred.
##
## In all the above cases the default is to delete objects in a blocking way,
## like if DEL was called. However you can configure each case specifically
## in order to instead release memory in a non-blocking way like if UNLINK
## was called, using the following configuration directives.

## BEGIN MEIZHAOHUI COMMENTS
##   Redis有两个命令用于删除键。一个称为DEL，是对对象的阻塞删除。
##   这意味着服务器停止处理新命令，以便以同步方式回收与对象关联的所有内存。
##   如果删除的键与一个小对象相关联，则执行DEL命令所需的时间非常短，
##   与Redis中的大多数其他O（1）或O（log_N）命令相当。但是，
##   如果key与包含数百万个元素的聚合值关联，则服务器可以阻塞很长时间（甚至几秒钟）以完成操作。
##
##   出于上述原因，Redis还提供了UNLINK（non-blocking DEL）等非阻塞删除命令
##   以及FLUSHALL和FLUSHDB命令的异步选项，以便在后台回收内存。
##   这些命令在固定时间内执行。另一个线程将尽可能在后台释放对象。
##
##   FLUSHALL和FLUSHDB的DEL、UNLINK和ASYNC选项由用户控制。
##   这取决于应用程序的设计，所以了解何时使用一个或另一个是一个好主意。
##   然而，Redis服务器有时不得不删除keys或刷新整个数据库，这是其他操作的副作用。
##   具体来说，在以下情况下，Redis独立于用户调用删除对象：
##   1.在逐出时，由于maxmemory和maxmemory策略配置，为了在不超过指定内存限制的情况下为新数据腾出空间
##   2.因为过期：必须从内存中删除具有相关生存时间的key
##   3.因为将数据存储在可能已经存在的keys上的命令的副作用。
##       例如，当旧的keys内容被另一个keys内容替换时，RENAME命令可能会删除它。
##       类似地，SUNIONSTORE或SORT with STORE选项可以删除现有keys。
##       SET命令本身删除指定键的任何旧内容，以便用指定字符串替换它。
##   4.在复制过程中，当复制副本与其主服务器执行完全重新同步时，将删除整个数据库的内容，以便加载刚刚传输的RDB文件。
## END MEIZHAOHUI COMMENTS

lazyfree-lazy-eviction no
## BEGIN MEIZHAOHUI COMMENTS
##   当 redis 内存达到阈值 maxmemory 时，是否开启异步惰性淘汰，
##   开启的话，可能使用淘汰键的内存释放不及时，导致redis内存超用，超过maxmemory的限制不建议开启。
## END MEIZHAOHUI COMMENTS
lazyfree-lazy-expire no
## BEGIN MEIZHAOHUI COMMENTS
##   针对设置有TTL的键，达到过期后，被redis清理删除时是否采用lazy free机制。
##   没特殊要求的话，保持默认不开启。
## END MEIZHAOHUI COMMENTS
lazyfree-lazy-server-del no
## BEGIN MEIZHAOHUI COMMENTS
##   执行DEL命令时，是否异步执行删除操作。
##   没特殊要求的话，保持默认不开启。
## END MEIZHAOHUI COMMENTS
replica-lazy-flush no
## BEGIN MEIZHAOHUI COMMENTS
##   主要用于复制过程中，全量同步的场景，从节点是否异步删除整个db。
##   没特殊要求的话，保持默认不开启。
## END MEIZHAOHUI COMMENTS


## It is also possible, for the case when to replace the user code DEL calls
## with UNLINK calls is not easy, to modify the default behavior of the DEL
## command to act exactly like UNLINK, using the following configuration
## directive:
## BEGIN MEIZHAOHUI COMMENTS
##   将代码中的del替换成unlink可能不是那么太容易，所以为了让del
##   命令的实际效果等价于unlink，
##   你可以修改配置文件为lazyfree-lazy-user-del yes
## END MEIZHAOHUI COMMENTS
lazyfree-lazy-user-del no

## FLUSHDB, FLUSHALL, and SCRIPT FLUSH support both asynchronous and synchronous
## deletion, which can be controlled by passing the [SYNC|ASYNC] flags into the
## commands. When neither flag is passed, this directive will be used to determine
## if the data should be deleted asynchronously.

## BEGIN MEIZHAOHUI COMMENTS
##   FLUSHDB、FLUSHALL 和 SCRIPT FLUSH 支持异步和同步
##   删除，可通过将 [SYNC|ASYNC] 标志传递到命令中来控制。
##   当未传递任何标志时，此指令将用于确定是否应异步删除数据。
##   保持默认不启用异步删除。
## END MEIZHAOHUI COMMENTS
lazyfree-lazy-user-flush no

################################# THREADED I/O #################################

## Redis is mostly single threaded, however there are certain threaded
## operations such as UNLINK, slow I/O accesses and other things that are
## performed on side threads.
##
## Now it is also possible to handle Redis clients socket reads and writes
## in different I/O threads. Since especially writing is so slow, normally
## Redis users use pipelining in order to speed up the Redis performances per
## core, and spawn multiple instances in order to scale more. Using I/O
## threads it is possible to easily speedup two times Redis without resorting
## to pipelining nor sharding of the instance.
##
## By default threading is disabled, we suggest enabling it only in machines
## that have at least 4 or more cores, leaving at least one spare core.
## Using more than 8 threads is unlikely to help much. We also recommend using
## threaded I/O only if you actually have performance problems, with Redis
## instances being able to use a quite big percentage of CPU time, otherwise
## there is no point in using this feature.
##
## So for instance if you have a four cores boxes, try to use 2 or 3 I/O
## threads, if you have a 8 cores, try to use 6 threads. In order to
## enable I/O threads use the following configuration directive:
##
## io-threads 4
## BEGIN MEIZHAOHUI COMMENTS
##   官方表示，当使用redis时有性能瓶颈时，才推荐开启该功能，但是消耗更多的cpu时间。
##   并且，开启i/o多线程，至少要是4核以上的cpu，
##   并且需要预留一个空闲cpu。
##   比如4核就配io-threads=2，
##   8核至多配io-threads=6。
##   对于4核以上的机器，官方更推荐配置io-threads=4，
##   因为再往上叠加，收益相对较低了，也没有太大必要。
## END MEIZHAOHUI COMMENTS

##
## Setting io-threads to 1 will just use the main thread as usual.
## When I/O threads are enabled, we only use threads for writes, that is
## to thread the write(2) syscall and transfer the client buffers to the
## socket. However it is also possible to enable threading of reads and
## protocol parsing using the following configuration directive, by setting
## it to yes:
## io-threads-do-reads no
## BEGIN MEIZHAOHUI COMMENTS
##   io-threads-do-reads配置默认no。
##   i/o多线程默认是的是写socket多线程，socket连接本身就是epoll多路复用模式，
##   理解下来开启此配置对性能不太有提升空间。
## END MEIZHAOHUI COMMENTS
##
## Usually threading reads doesn't help much.
##
## NOTE 1: This configuration directive cannot be changed at runtime via
## CONFIG SET. Aso this feature currently does not work when SSL is
## enabled.
##
## NOTE 2: If you want to test the Redis speedup using redis-benchmark, make
## sure you also run the benchmark itself in threaded mode, using the
## --threads option to match the number of Redis threads, otherwise you'll not
## be able to notice the improvements.

############################# KERNEL OOM CONTROL ##############################

## On Linux, it is possible to hint the kernel OOM killer on what processes
## should be killed first when out of memory.
##
## Enabling this feature makes Redis actively control the oom_score_adj value
## for all its processes, depending on their role. The default scores will
## attempt to have background child processes killed before all others, and
## replicas killed before masters.
##
## Redis supports three options:
##
## no:       Don't make changes to oom-score-adj (default).
## yes:      Alias to "relative" see below.
## absolute: Values in oom-score-adj-values are written as is to the kernel.
## relative: Values are used relative to the initial value of oom_score_adj when
##           the server starts and are then clamped to a range of -1000 to 1000.
##           Because typically the initial value is 0, they will often match the
##           absolute values.
oom-score-adj no
## BEGIN MEIZHAOHUI COMMENTS
##   在 Linux 上，可以提示内核 OOM 终止程序在内存不足时应首先终止哪些进程。
##   oom-score-adj 参数用于设置 Redis 进程在内存不足时被系统杀死的可能性。
##   保持默认不开启。
## END MEIZHAOHUI COMMENTS

## When oom-score-adj is used, this directive controls the specific values used
## for master, replica and background child processes. Values range -2000 to
## 2000 (higher means more likely to be killed).
##
## Unprivileged processes (not root, and without CAP_SYS_RESOURCE capabilities)
## can freely increase their value, but not decrease it below its initial
## settings. This means that setting oom-score-adj to "relative" and setting the
## oom-score-adj-values to positive values will always succeed.
oom-score-adj-values 0 200 800
## BEGIN MEIZHAOHUI COMMENTS
##   oom-score-adj 配置未开启，此配置无效。
## END MEIZHAOHUI COMMENTS


##################### KERNEL transparent hugepage CONTROL ######################

## Usually the kernel Transparent Huge Pages control is set to "madvise" or
## or "never" by default (/sys/kernel/mm/transparent_hugepage/enabled), in which
## case this config has no effect. On systems in which it is set to "always",
## redis will attempt to disable it specifically for the redis process in order
## to avoid latency problems specifically with fork(2) and CoW.
## If for some reason you prefer to keep it enabled, you can set this config to
## "no" and the kernel global to "always".

disable-thp yes
## BEGIN MEIZHAOHUI COMMENTS
##   disable-thp 配置项是用来控制是否禁用Transparent Huge Pages (THP)特性的。
##   THP透明大页是Linux系统中用于支持大页面的一个特性，它可以提高内存的使用效率，
##   但也可能对一些需要低延迟的应用程序造成影响，因为它会破坏内存的局部性。
##       cat /sys/kernel/mm/transparent_hugepage/enabled
##       [always] madvise never   <------- 这种是透明大页开启状态
##       cat /sys/kernel/mm/transparent_hugepage/enabled
##       always madvise [never]   <------- 这种是透明大页关闭状态
## END MEIZHAOHUI COMMENTS

############################### APPEND ONLY MODE ###############################

## By default Redis asynchronously dumps the dataset on disk. This mode is
## good enough in many applications, but an issue with the Redis process or
## a power outage may result into a few minutes of writes lost (depending on
## the configured save points).
##
## The Append Only File is an alternative persistence mode that provides
## much better durability. For instance using the default data fsync policy
## (see later in the config file) Redis can lose just one second of writes in a
## dramatic event like a server power outage, or a single write if something
## wrong with the Redis process itself happens, but the operating system is
## still running correctly.
##
## AOF and RDB persistence can be enabled at the same time without problems.
## If the AOF is enabled on startup Redis will load the AOF, that is the file
## with the better durability guarantees.
##
## Please check https://redis.io/topics/persistence for more information.
## BEGIN MEIZHAOHUI COMMENTS
##   默认情况下，Redis 会异步将数据集转储到磁盘上。
##   此模式在许多应用程序中都足够好，但 Redis 进程出现问题或断电可能会导致几分钟的写入丢失（取决于配置的保存点）。
##
##   这种只增文件是可选的能够提供更好的体验的数据持久化策略。
##   Redis 可能会在服务器断电等重大事件中丢失一秒钟的写入，
##   或者如果 Redis 进程本身出现问题，但操作系统仍在正常运行，则只会丢失一次写入。
##   可以同时启用 AOF 和 RDB 持久性而不会出现问题。
##   如果在启动时启用了 AOF，Redis 将加载 AOF，即具有更好耐用性保证的文件。
## END MEIZHAOHUI COMMENTS

## appendonly no
appendonly yes
## BEGIN MEIZHAOHUI COMMENTS
##   默认 appendonly no 表示未开启AOF只增文件模式。
##   为了让我们Redis在异常时数据丢失更少，开启该参数，
##   设置appendonly yes 打开 AOF持久化。
## END MEIZHAOHUI COMMENTS

## The name of the append only file (default: "appendonly.aof")

appendfilename "appendonly.aof"
## BEGIN MEIZHAOHUI COMMENTS
##   AOF持久化文件名
## END MEIZHAOHUI COMMENTS

## The fsync() call tells the Operating System to actually write data on disk
## instead of waiting for more data in the output buffer. Some OS will really flush
## data on disk, some other OS will just try to do it ASAP.
##
## Redis supports three different modes:
##
## no: don't fsync, just let the OS flush the data when it wants. Faster.
## always: fsync after every write to the append only log. Slow, Safest.
## everysec: fsync only one time every second. Compromise.
##
## The default is "everysec", as that's usually the right compromise between
## speed and data safety. It's up to you to understand if you can relax this to
## "no" that will let the operating system flush the output buffer when
## it wants, for better performances (but if you can live with the idea of
## some data loss consider the default persistence mode that's snapshotting),
## or on the contrary, use "always" that's very slow but a bit safer than
## everysec.
##
## More details please check the following article:
## http://antirez.com/post/redis-persistence-demystified.html
##
## If unsure, use "everysec".

## BEGIN MEIZHAOHUI COMMENTS
##   fsync() 调用会告知操作系统实际将数据写入磁盘，
##   而不是等待输出缓冲区中出现更多数据。有些操作系统会真正刷新磁盘上的数据，
##   而有些操作系统则会尝试尽快执行此操作。
##   Redis 支持三种不同的模式：
##
##   no：不进行 fsync，只让操作系统在需要时刷新数据。速度更快。
##   always：每次写入仅附加日志后进行 fsync。速度慢，最安全。
##   everysec：每秒仅进行一次 fsync。折衷。
##   默认值为“everysec”，因为这通常是速度和数据安全性之间的正确折衷。
##
##   我们使用默认值 appendfsync everysec 每秒写入一次。
## END MEIZHAOHUI COMMENTS

## appendfsync always
appendfsync everysec
## appendfsync no

## When the AOF fsync policy is set to always or everysec, and a background
## saving process (a background save or AOF log background rewriting) is
## performing a lot of I/O against the disk, in some Linux configurations
## Redis may block too long on the fsync() call. Note that there is no fix for
## this currently, as even performing fsync in a different thread will block
## our synchronous write(2) call.
##
## In order to mitigate this problem it's possible to use the following option
## that will prevent fsync() from being called in the main process while a
## BGSAVE or BGREWRITEAOF is in progress.
##
## This means that while another child is saving, the durability of Redis is
## the same as "appendfsync none". In practical terms, this means that it is
## possible to lose up to 30 seconds of log in the worst scenario (with the
## default Linux settings).
##
## If you have latency problems turn this to "yes". Otherwise leave it as
## "no" that is the safest pick from the point of view of durability.

## BEGIN MEIZHAOHUI COMMENTS
##   bgrewriteaof机制，在一个子进程中进行aof的重写，
##   从而不阻塞主进程对其余命令的处理，同时解决了aof文件过大问题。
##   现在问题出现了，同时在执行bgrewriteaof操作和主进程写aof文件的操作，
##   两者都会操作磁盘，而bgrewriteaof往往会涉及大量磁盘操作，
##   这样就会造成主进程在写aof文件的时候出现阻塞的情形，
##   现在no-appendfsync-on-rewrite参数出场了。
##   如果该参数设置为no，是最安全的方式，不会丢失数据，但是要忍受阻塞的问题。
##   如果设置为yes呢？这就相当于将appendfsync设置为no，这说明并没有执行磁盘操作，
##   只是写入了缓冲区，因此这样并不会造成阻塞（因为没有竞争磁盘），
##   但是如果这个时候redis挂掉，就会丢失数据。丢失多少数据呢？
##   在linux的操作系统的默认设置下，最多会丢失30s的数据。
##   因此，如果应用系统无法忍受延迟，而可以容忍少量的数据丢失，则设置为yes。
##   如果应用系统无法忍受数据丢失，则设置为no。
## END MEIZHAOHUI COMMENTS
no-appendfsync-on-rewrite no

## Automatic rewrite of the append only file.
## Redis is able to automatically rewrite the log file implicitly calling
## BGREWRITEAOF when the AOF log size grows by the specified percentage.
##
## This is how it works: Redis remembers the size of the AOF file after the
## latest rewrite (if no rewrite has happened since the restart, the size of
## the AOF at startup is used).
##
## This base size is compared to the current size. If the current size is
## bigger than the specified percentage, the rewrite is triggered. Also
## you need to specify a minimal size for the AOF file to be rewritten, this
## is useful to avoid rewriting the AOF file even if the percentage increase
## is reached but it is still pretty small.
##
## Specify a percentage of zero in order to disable the automatic AOF
## rewrite feature.

## BEGIN MEIZHAOHUI COMMENTS
##   auto-aof-rewrite-percentage，设置触发 AOF 重写的百分比,一般建议设置为 100% 。
##   当 AOF 文件体积增长超过上次 AOF 重写的体积的指定百分比时，
##   Redis 会自动触发一个新的 AOF 重写操作。
##   auto-aof-rewrite-min-size 设置最小 AOF 文件大小,一般建议设置为 64mb。
## END MEIZHAOHUI COMMENTS
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb


## An AOF file may be found to be truncated at the end during the Redis
## startup process, when the AOF data gets loaded back into memory.
## This may happen when the system where Redis is running
## crashes, especially when an ext4 filesystem is mounted without the
## data=ordered option (however this can't happen when Redis itself
## crashes or aborts but the operating system still works correctly).
##
## Redis can either exit with an error when this happens, or load as much
## data as possible (the default now) and start if the AOF file is found
## to be truncated at the end. The following option controls this behavior.
##
## If aof-load-truncated is set to yes, a truncated AOF file is loaded and
## the Redis server starts emitting a log to inform the user of the event.
## Otherwise if the option is set to no, the server aborts with an error
## and refuses to start. When the option is set to no, the user requires
## to fix the AOF file using the "redis-check-aof" utility before to restart
## the server.
##
## Note that if the AOF file will be found to be corrupted in the middle
## the server will still exit with an error. This option only applies when
## Redis will try to read more data from the AOF file but not enough bytes
## will be found.
## BEGIN MEIZHAOHUI COMMENTS
##   aof文件可能在尾部是不完整的，当redis启动的时候，aof文件的数据被载入内存。
##   重启可能发生在redis所在的主机操作系统宕机后，尤其在ext4文件系统没有加上data=ordered选项会出现这种现象。
##   redis宕机或者异常终止不会造成尾部不完整现象，可以选择让redis退出，
##   或者导入尽可能多的数据。如果选择的是yes，当截断的aof文件被导入的时候，
##   会自动发布一个log给客户端然后load。
##   如果是no，用户必须手动redis-check-aof修复AOF文件才可以。
## END MEIZHAOHUI COMMENTS
aof-load-truncated yes

## When rewriting the AOF file, Redis is able to use an RDB preamble in the
## AOF file for faster rewrites and recoveries. When this option is turned
## on the rewritten AOF file is composed of two different stanzas:
##
##   [RDB file][AOF tail]
##
## When loading, Redis recognizes that the AOF file starts with the "REDIS"
## string and loads the prefixed RDB file, then continues loading the AOF
## tail.
## BEGIN MEIZHAOHUI COMMENTS
##   在Redis4.0之后，新增了RDB-AOF混合持久化方式。这种方式结合了RDB和AOF的优点，既能快速加载又能避免丢失过多的数据。
##   具体配置为：aof-use-rdb-preamble: 设置为yes表示开启，设置为no表示禁用。
##   当开启混合持久化时，主进程先fork出子进程将现有内存副本全量以RDB方式写入aof文件中，
##   然后将缓冲区中的增量命令以AOF方式写入aof文件中，
##   写入完成后通知主进程更新相关信息，并将新的含有 RDB和AOF两种格式的aof文件替换旧的aof文件。
##   简单来说：混合持久化方式产生的文件一部分是RDB格式，一部分是AOF格式。
## END MEIZHAOHUI COMMENTS
aof-use-rdb-preamble yes

################################# LUA SCRIPTING  ###############################

## Max execution time of a Lua script in milliseconds.
##
## If the maximum execution time is reached Redis will log that a script is
## still in execution after the maximum allowed time and will start to
## reply to queries with an error.
##
## When a long running script exceeds the maximum execution time only the
## SCRIPT KILL and SHUTDOWN NOSAVE commands are available. The first can be
## used to stop a script that did not yet call any write commands. The second
## is the only way to shut down the server in the case a write command was
## already issued by the script but the user doesn't want to wait for the natural
## termination of the script.
##
## Set it to 0 or a negative value for unlimited execution without warnings.
## BEGIN MEIZHAOHUI COMMENTS
##   Lua脚本的使用和设置超时时间，默认5000毫秒，即5秒。
##   但这里有个坑，当一个脚本达到最大执行时长的时候，Redis并不会强制停止脚本的运行，
##   仅仅在日志里打印个警告，告知有脚本超时。
##   开始允许接受其他客户端请求，但仅限于 SCRIPT KILL 和 SHUTDOWN NOSAVE 两个命令
##   其他请求仍返回busy错误，
##   如果脚本已经改写了数据内容，SCRIPT KILL将报出以下错误，因为它破坏数据集的内容。
##   为什么不能直接停掉呢？
##   因为 Redis 必须保证脚本执行的原子性，中途停止可能导致内存的数据集上只修改了部分数据。
##
##   Redis脚本里的写命令是等到执行完成后再一次性写入AOF的。
##   参考：https://www.jb51.net/article/230175.htm Redis中Lua脚本的使用和设置超时
## END MEIZHAOHUI COMMENTS
lua-time-limit 5000

################################# REDIS CLUSTER  ###############################

## Normal Redis instances can't be part of a Redis Cluster; only nodes that are
## started as cluster nodes can. In order to start a Redis instance as a
## cluster node enable the cluster support uncommenting the following:
## BEGIN MEIZHAOHUI COMMENTS
##   普通 Redis 实例不能成为 Redis 集群的一部分；只有作为集群节点启动的节点才可以。
##   为了将 Redis 实例作为集群节点启动，请取消注释以下内容以启用集群支持：
## END MEIZHAOHUI COMMENTS
##
## cluster-enabled yes

## Every cluster node has a cluster configuration file. This file is not
## intended to be edited by hand. It is created and updated by Redis nodes.
## Every Redis Cluster node requires a different cluster configuration file.
## Make sure that instances running in the same system do not have
## overlapping cluster configuration file names.
## BEGIN MEIZHAOHUI COMMENTS
##   每个集群节点都有一个集群配置文件。此文件不应手动编辑。它由 Redis 节点创建和更新。
##   每个 Redis 集群节点都需要不同的集群配置文件。
##   确保在同一系统中运行的实例没有重复的集群配置文件名。
## END MEIZHAOHUI COMMENTS
##
## cluster-config-file nodes-6379.conf

## Cluster node timeout is the amount of milliseconds a node must be unreachable
## for it to be considered in failure state.
## Most other internal time limits are a multiple of the node timeout.
## BEGIN MEIZHAOHUI COMMENTS
##   集群节点超时是节点必须处于不可访问状态的毫秒数。
##   才会被视为处于故障状态。
##   大多数其他内部时间限制都是节点超时的倍数。
## END MEIZHAOHUI COMMENTS
##
## cluster-node-timeout 15000

## A replica of a failing master will avoid to start a failover if its data
## looks too old.
##
## There is no simple way for a replica to actually have an exact measure of
## its "data age", so the following two checks are performed:
##
## 1) If there are multiple replicas able to failover, they exchange messages
##    in order to try to give an advantage to the replica with the best
##    replication offset (more data from the master processed).
##    Replicas will try to get their rank by offset, and apply to the start
##    of the failover a delay proportional to their rank.
##
## 2) Every single replica computes the time of the last interaction with
##    its master. This can be the last ping or command received (if the master
##    is still in the "connected" state), or the time that elapsed since the
##    disconnection with the master (if the replication link is currently down).
##    If the last interaction is too old, the replica will not try to failover
##    at all.
##
## The point "2" can be tuned by user. Specifically a replica will not perform
## the failover if, since the last interaction with the master, the time
## elapsed is greater than:
##
##   (node-timeout * cluster-replica-validity-factor) + repl-ping-replica-period
##
## So for example if node-timeout is 30 seconds, and the cluster-replica-validity-factor
## is 10, and assuming a default repl-ping-replica-period of 10 seconds, the
## replica will not try to failover if it was not able to talk with the master
## for longer than 310 seconds.
## BEGIN MEIZHAOHUI COMMENTS
##   如果数据看起来太旧，故障主服务器的副本将避免启动故障转移。
##   对于副本来说，没有简单的方法可以准确测量其“数据年龄”，因此需要执行以下两项检查：
##  
##   1) 如果有多个副本能够进行故障转移，它们将交换消息，以尝试为具有最佳复制偏移量的副本（处理来自主服务器的更多数据）提供优势(可以理解为优先级)。
##   副本将尝试通过偏移量获取其排名，并在故障转移开始时应用与其排名成比例的延迟。
##   2) 每个副本计算与其主服务器最后一次交互的时间。这可以是最后一次收到的 ping 或命令（如果主服务器仍处于“连接”状态），
##   也可以是自与主服务器断开连接以来经过的时间（如果复制链接当前已关闭）。
##   如果最后一次交互太旧，副本将根本不会尝试故障转移。
##  
##   点“2”可以由用户调整。具体来说，如果自上次与主服务器交互以来，经过的时间大于：
##   (node-timeout * cluster-replica-validity-factor) + repl-ping-replica-period
##  
##   例如，如果 node-timeout 为 30 秒，cluster-replica-validity-factor为 10，
##   并假设默认 repl-ping-replica-period 为 10 秒，
##   则如果副本无法与主服务器通信超过 310 秒，则副本将不会尝试故障转移。
## END MEIZHAOHUI COMMENTS

##
## A large cluster-replica-validity-factor may allow replicas with too old data to failover
## a master, while a too small value may prevent the cluster from being able to
## elect a replica at all.
##
## For maximum availability, it is possible to set the cluster-replica-validity-factor
## to a value of 0, which means, that replicas will always try to failover the
## master regardless of the last time they interacted with the master.
## (However they'll always try to apply a delay proportional to their
## offset rank).
##
## Zero is the only value able to guarantee that when all the partitions heal
## the cluster will always be able to continue.
## BEGIN MEIZHAOHUI COMMENTS
##   较大的 cluster-replica-validity-factor 可能允许数据过旧的副本故障转移为主服务器，
##   而太小的值可能会阻止集群能够# 选举副本。
##   如果设置为 0 ，则不管 slave 与 master 之间断开多久，都认为自己有资格成为 master。
## END MEIZHAOHUI COMMENTS
##
## cluster-replica-validity-factor 10

## Cluster replicas are able to migrate to orphaned masters, that are masters
## that are left without working replicas. This improves the cluster ability
## to resist to failures as otherwise an orphaned master can't be failed over
## in case of failure if it has no working replicas.
##
## Replicas migrate to orphaned masters only if there are still at least a
## given number of other working replicas for their old master. This number
## is the "migration barrier". A migration barrier of 1 means that a replica
## will migrate only if there is at least 1 other working replica for its master
## and so forth. It usually reflects the number of replicas you want for every
## master in your cluster.
##
## Default is 1 (replicas migrate only if their masters remain with at least
## one replica). To disable migration just set it to a very large value or
## set cluster-allow-replica-migration to 'no'.
## A value of 0 can be set but is useful only for debugging and dangerous
## in production.
## BEGIN MEIZHAOHUI COMMENTS
##   没有 slave 节点的 master 节点称为孤儿 master节点，这个配置就是用于防止出现裸奔的 master。
##   当某个 master 的 slave 节点宕机后，集群会从其他 master 中选出一个富余的 slave 节点迁移过来，
##   确保每个 master 节点至少有一个 slave 节点，
##   防止当孤立 master 节点宕机时，没有slave节点可以升为 master 导致集群不可用。
##   默认配置为 cluster-migration-barrier 1，是一个迁移临界值。
##   含义是：迁移后 master 节点至少还有 1 个 slave 节点才能做迁移操作。
##   比如 master A 节点有2个以上 slave 节点 ，当集群出现孤儿 master B 节点时，
##   A 节点富余的 slave 节点可以迁移到 master B 节点上。
##   生产环境建议维持默认值，最大可能保证高可用。
## END MEIZHAOHUI COMMENTS
##
## cluster-migration-barrier 1

## Turning off this option allows to use less automatic cluster configuration.
## It both disables migration to orphaned masters and migration from masters
## that became empty.
##
## Default is 'yes' (allow automatic migrations).
##
## BEGIN MEIZHAOHUI COMMENTS
##   允许自动迁移。
## END MEIZHAOHUI COMMENTS
## cluster-allow-replica-migration yes

## By default Redis Cluster nodes stop accepting queries if they detect there
## is at least a hash slot uncovered (no available node is serving it).
## This way if the cluster is partially down (for example a range of hash slots
## are no longer covered) all the cluster becomes, eventually, unavailable.
## It automatically returns available as soon as all the slots are covered again.
##
## However sometimes you want the subset of the cluster which is working,
## to continue to accept queries for the part of the key space that is still
## covered. In order to do so, just set the cluster-require-full-coverage
## option to no.
##
## BEGIN MEIZHAOHUI COMMENTS
##   当 redis cluster 发现至少还有一个 哈希槽没有被分配时禁止查询操作。
##   这就会导致集群部分宕机，整个集群就不可用了，
##   当所有哈希槽都有分配，集群会自动变为可用状态。
##   默认值 yes , 即需要集群完整性，方可对外提供服务。
## END MEIZHAOHUI COMMENTS
## cluster-require-full-coverage yes

## This option, when set to yes, prevents replicas from trying to failover its
## master during master failures. However the replica can still perform a
## manual failover, if forced to do so.
##
## This is useful in different scenarios, especially in the case of multiple
## data center operations, where we want one side to never be promoted if not
## in the case of a total DC failure.
##
## BEGIN MEIZHAOHUI COMMENTS
##   默认配置为 no，当配置成 yes，在master 宕机时，slave 不会做故障转移升为 master。
##   这个配置在多数据中心的情况下会很有用，你可能希望某个数据中心永远不要升级为 master 节点，
##   否则 master 节点就漂移到其他数据中心了。
## END MEIZHAOHUI COMMENTS
## cluster-replica-no-failover no

## This option, when set to yes, allows nodes to serve read traffic while the
## the cluster is in a down state, as long as it believes it owns the slots. 
##
## This is useful for two cases.  The first case is for when an application 
## doesn't require consistency of data during node failures or network partitions.
## One example of this is a cache, where as long as the node has the data it
## should be able to serve it. 
##
## The second use case is for configurations that don't meet the recommended  
## three shards but want to enable cluster mode and scale later. A 
## master outage in a 1 or 2 shard configuration causes a read/write outage to the
## entire cluster without this option set, with it set there is only a write outage.
## Without a quorum of masters, slot ownership will not change automatically. 
##
## BEGIN MEIZHAOHUI COMMENTS
##   cluster-allow-reads-when-down配置选项用于控制在节点
##   标记为FAIL（即节点认为它自己已经下线，不能正确处理命令请求）时，
##   集群是否允许对该节点进行读操作。
##
##   当cluster-allow-reads-when-down配置项设置为yes时，
##   即使一个节点因为网络分区问题被集群标记为FAIL，
##   集群的其他节点仍然可以从这个节点进行读操作。
##   这可以提供一定程度的数据可读性，
##   但是需要注意，由于数据可能不同步，因此可能会返回过时的数据。
##
##   当cluster-allow-reads-when-down配置项设置为no时，
##   一旦一个节点被集群标记为FAIL，它将不再从这个节点进行读操作。
## END MEIZHAOHUI COMMENTS
## cluster-allow-reads-when-down no

## In order to setup your cluster make sure to read the documentation
## available at https://redis.io web site.

########################### CLUSTER DOCKER/NAT support  ########################

## In certain deployments, Redis Cluster nodes address discovery fails, because
## addresses are NAT-ted or because ports are forwarded (the typical case is
## Docker and other containers).
## BEGIN MEIZHAOHUI COMMENTS
##   在某些部署中，Redis 集群节点地址发现失败，因为
##   地址经过了 NAT 处理或者端口被转发（典型情况是
##   Docker 和其他容器）。
##
##   我们此处不用docker部署redis,忽略下面这四个配置项。
## END MEIZHAOHUI COMMENTS
##
## In order to make Redis Cluster working in such environments, a static
## configuration where each node knows its public address is needed. The
## following four options are used for this scope, and are:
##
## * cluster-announce-ip
## * cluster-announce-port
## * cluster-announce-tls-port
## * cluster-announce-bus-port
##
## Each instructs the node about its address, client ports (for connections
## without and with TLS) and cluster message bus port. The information is then
## published in the header of the bus packets so that other nodes will be able to
## correctly map the address of the node publishing the information.
##
## If cluster-tls is set to yes and cluster-announce-tls-port is omitted or set
## to zero, then cluster-announce-port refers to the TLS port. Note also that
## cluster-announce-tls-port has no effect if cluster-tls is set to no.
##
## If the above options are not used, the normal Redis Cluster auto-detection
## will be used instead.
##
## Note that when remapped, the bus port may not be at the fixed offset of
## clients port + 10000, so you can specify any port and bus-port depending
## on how they get remapped. If the bus-port is not set, a fixed offset of
## 10000 will be used as usual.
##
## Example:
##
## cluster-announce-ip 10.1.1.5
## cluster-announce-tls-port 6379
## cluster-announce-port 0
## cluster-announce-bus-port 6380

################################### SLOW LOG ###################################

## The Redis Slow Log is a system to log queries that exceeded a specified
## execution time. The execution time does not include the I/O operations
## like talking with the client, sending the reply and so forth,
## but just the time needed to actually execute the command (this is the only
## stage of command execution where the thread is blocked and can not serve
## other requests in the meantime).
##
## You can configure the slow log with two parameters: one tells Redis
## what is the execution time, in microseconds, to exceed in order for the
## command to get logged, and the other parameter is the length of the
## slow log. When a new command is logged the oldest one is removed from the
## queue of logged commands.

## The following time is expressed in microseconds, so 1000000 is equivalent
## to one second. Note that a negative number disables the slow log, while
## a value of zero forces the logging of every command.
## BEGIN MEIZHAOHUI COMMENTS
##   执行时间超过该值的命令会被记录在慢查询日志中。
##   该值的单位是微秒，当执行时间超过这个值的命令会被记录，
##   值为0表示记录所有命令，值为负数表示不记录任何命令。
##   微秒（1秒 = 1000毫秒 = 1000000微秒）
## END MEIZHAOHUI COMMENTS
slowlog-log-slower-than 10000

## There is no limit to this length. Just be aware that it will consume memory.
## You can reclaim memory used by the slow log with SLOWLOG RESET.
## BEGIN MEIZHAOHUI COMMENTS
##   slowlog-max-len的作用是指定慢查询日志最多存储的条数。
##   实际上，Redis使用了一个列表存放慢查询日志，
##   slowlog-max-len就是这个列表的最大长度。
##   当一个新的命令满足满足慢查询条件时，被插入这个列表中。
##   当慢查询日志列表已经达到最大长度时，最早插入的那条命令将被从列表中移出。
##   比如，slowlog-max-len被设置为10，当有第11条命令插入时，
##   在列表中的第1条命令先被移出，然后再把第11条命令放入列表。
## END MEIZHAOHUI COMMENTS
slowlog-max-len 128

################################# LATENCY MONITOR ##############################

## The Redis latency monitoring subsystem samples different operations
## at runtime in order to collect data related to possible sources of
## latency of a Redis instance.
##
## Via the LATENCY command this information is available to the user that can
## print graphs and obtain reports.
##
## The system only logs operations that were performed in a time equal or
## greater than the amount of milliseconds specified via the
## latency-monitor-threshold configuration directive. When its value is set
## to zero, the latency monitor is turned off.
##
## By default latency monitoring is disabled since it is mostly not needed
## if you don't have latency issues, and collecting data has a performance
## impact, that while very small, can be measured under big load. Latency
## monitoring can easily be enabled at runtime using the command
## "CONFIG SET latency-monitor-threshold <milliseconds>" if needed.
## BEGIN MEIZHAOHUI COMMENTS
##   延迟监视器
##   Redis 延迟监视子系统在运行时对不同的操作进行采样，
##   以便收集与 Redis 实例的可能延迟源相关的数据。
##   这个参数的默认值是0，意味着禁用延迟监控。
##   用于指定处理命令请求的最大延迟时间（单位微秒）。
##   如果某个命令的处理延迟超过这个值，Redis 会在日志中记录一条警告信息。
##   如果你想启用并设置一个特定的阈值，请确保将其值设置为合理的高低值，
##   以避免在正常的操作中记录警告。
## END MEIZHAOHUI COMMENTS
latency-monitor-threshold 0

############################## EVENT NOTIFICATION ##############################

## Redis can notify Pub/Sub clients about events happening in the key space.
## This feature is documented at https://redis.io/topics/notifications
##
## For instance if keyspace events notification is enabled, and a client
## performs a DEL operation on key "foo" stored in the Database 0, two
## messages will be published via Pub/Sub:
##
## PUBLISH __keyspace@0__:foo del
## PUBLISH __keyevent@0__:del foo
##
## It is possible to select the events that Redis will notify among a set
## of classes. Every class is identified by a single character:
##
##  K     Keyspace events, published with __keyspace@<db>__ prefix.
##  E     Keyevent events, published with __keyevent@<db>__ prefix.
##  g     Generic commands (non-type specific) like DEL, EXPIRE, RENAME, ...
##  $     String commands
##  l     List commands
##  s     Set commands
##  h     Hash commands
##  z     Sorted set commands
##  x     Expired events (events generated every time a key expires)
##  e     Evicted events (events generated when a key is evicted for maxmemory)
##  t     Stream commands
##  d     Module key type events
##  m     Key-miss events (Note: It is not included in the 'A' class)
##  A     Alias for g$lshzxetd, so that the "AKE" string means all the events
##        (Except key-miss events which are excluded from 'A' due to their
##         unique nature).
##
##  The "notify-keyspace-events" takes as argument a string that is composed
##  of zero or multiple characters. The empty string means that notifications
##  are disabled.
##
##  Example: to enable list and generic events, from the point of view of the
##           event name, use:
##
##  notify-keyspace-events Elg
##
##  Example 2: to get the stream of the expired keys subscribing to channel
##             name __keyevent@0__:expired use:
##
##  notify-keyspace-events Ex
##
##  By default all notifications are disabled because most users don't need
##  this feature and the feature has some overhead. Note that if you don't
##  specify at least one of K or E, no events will be delivered.
## BEGIN MEIZHAOHUI COMMENTS
##   事件通知。
##   默认情况下，所有通知均被禁用，
##   因为大多数用户不需要此功能，并且此功能有一些开销。
## END MEIZHAOHUI COMMENTS
notify-keyspace-events ""

################################ GOPHER SERVER #################################

## Redis contains an implementation of the Gopher protocol, as specified in
## the RFC 1436 (https://www.ietf.org/rfc/rfc1436.txt).
##
## The Gopher protocol was very popular in the late '90s. It is an alternative
## to the web, and the implementation both server and client side is so simple
## that the Redis server has just 100 lines of code in order to implement this
## support.
##
## What do you do with Gopher nowadays? Well Gopher never *really* died, and
## lately there is a movement in order for the Gopher more hierarchical content
## composed of just plain text documents to be resurrected. Some want a simpler
## internet, others believe that the mainstream internet became too much
## controlled, and it's cool to create an alternative space for people that
## want a bit of fresh air.
##
## Anyway for the 10nth birthday of the Redis, we gave it the Gopher protocol
## as a gift.
##
## --- HOW IT WORKS? ---
##
## The Redis Gopher support uses the inline protocol of Redis, and specifically
## two kind of inline requests that were anyway illegal: an empty request
## or any request that starts with "/" (there are no Redis commands starting
## with such a slash). Normal RESP2/RESP3 requests are completely out of the
## path of the Gopher protocol implementation and are served as usual as well.
##
## If you open a connection to Redis when Gopher is enabled and send it
## a string like "/foo", if there is a key named "/foo" it is served via the
## Gopher protocol.
##
## In order to create a real Gopher "hole" (the name of a Gopher site in Gopher
## talking), you likely need a script like the following:
##
##   https://github.com/antirez/gopher2redis
##
## --- SECURITY WARNING ---
##
## If you plan to put Redis on the internet in a publicly accessible address
## to server Gopher pages MAKE SURE TO SET A PASSWORD to the instance.
## Once a password is set:
##
##   1. The Gopher server (when enabled, not by default) will still serve
##      content via Gopher.
##   2. However other commands cannot be called before the client will
##      authenticate.
##
## So use the 'requirepass' option to protect your instance.
##
## Note that Gopher is not currently supported when 'io-threads-do-reads'
## is enabled.
##
## To enable Gopher support, uncomment the following line and set the option
## from no (the default) to yes.
##
## BEGIN MEIZHAOHUI COMMENTS
##   是否启用gopher协议的web访问。
##   Gopher 协议在 90 年代末非常流行。
##   它是 Web 的替代品，服务器端和客户端的实现都非常简单，
##   以至于 Redis 服务器只需 100 行代码即可实现此支持。
##   保持默认不开启。
## END MEIZHAOHUI COMMENTS
## gopher-enabled no

################################ ADVANCED CONFIG ###############################

## Hashes are encoded using a memory efficient data structure when they have a
## small number of entries, and the biggest entry does not exceed a given
## threshold. These thresholds can be configured using the following directives.
## BEGIN MEIZHAOHUI COMMENTS
##   高级设置。
##   当哈希值包含少量条目且最大条目不超过给定阈值时，
##   哈希值将使用内存高效的数据结构进行编码。
##   可以使用以下指令配置这些阈值。
##   hash-max-ziplist-entries，使用压缩列表保存时哈希集合中最大元素个数。
##   hash-max-ziplist-value， 使用压缩列表保存时哈希集合中单个元素的最大长度。
##   键值对个数小于512，所有的键值对的键和值的字符串长度都小于64个字节时用ziplist，否则用hashtable。
##   注意：ziplist可以升级为hashtable，但hashtable不能降级为ziplist，
##   在节省内存空间方面哈希表是没有压缩列表高效的！
## END MEIZHAOHUI COMMENTS
hash-max-ziplist-entries 512
hash-max-ziplist-value 64

## Lists are also encoded in a special way to save a lot of space.
## The number of entries allowed per internal list node can be specified
## as a fixed maximum size or a maximum number of elements.
## For a fixed maximum size, use -5 through -1, meaning:
## -5: max size: 64 Kb  <-- not recommended for normal workloads
## -4: max size: 32 Kb  <-- not recommended
## -3: max size: 16 Kb  <-- probably not recommended
## -2: max size: 8 Kb   <-- good
## -1: max size: 4 Kb   <-- good
## Positive numbers mean store up to _exactly_ that number of elements
## per list node.
## The highest performing option is usually -2 (8 Kb size) or -1 (4 Kb size),
## but if your use case is unique, adjust the settings as necessary.
## BEGIN MEIZHAOHUI COMMENTS
##   列表也以特殊方式编码以节省大量空间。
##   可以将每个内部列表节点允许的条目数指定为
##   固定最大大小或最大元素数。
##   对于固定最大大小，请使用 -5 到 -1，这意味着：
##   -5：最大大小：64 Kb <-- 不推荐用于正常工作负载
##   -4：最大大小：32 Kb <-- 不推荐
##   -3：最大大小：16 Kb <-- 可能不推荐
##   -2：最大大小：8 Kb <-- 好
##   -1：最大大小：4 Kb <-- 好
##   正数表示每个列表节点最多存储该数量的元素。
##   性能最高的选项通常是 -2（8 Kb 大小）或 -1（4 Kb 大小）。
##   保持默认即可。
## END MEIZHAOHUI COMMENTS
list-max-ziplist-size -2

## Lists may also be compressed.
## Compress depth is the number of quicklist ziplist nodes from *each* side of
## the list to *exclude* from compression.  The head and tail of the list
## are always uncompressed for fast push/pop operations.  Settings are:
## 0: disable all list compression
## 1: depth 1 means "don't start compressing until after 1 node into the list,
##    going from either the head or tail"
##    So: [head]->node->node->...->node->[tail]
##    [head], [tail] will always be uncompressed; inner nodes will compress.
## 2: [head]->[next]->node->node->...->node->[prev]->[tail]
##    2 here means: don't compress head or head->next or tail->prev or tail,
##    but compress all nodes between them.
## 3: [head]->[next]->[next]->node->node->...->node->[prev]->[prev]->[tail]
## etc.
## BEGIN MEIZHAOHUI COMMENTS
##   列表也可以进行压缩。默认为0，禁用列表压缩。
##   保持默认即可。
## END MEIZHAOHUI COMMENTS
list-compress-depth 0

## Sets have a special encoding in just one case: when a set is composed
## of just strings that happen to be integers in radix 10 in the range
## of 64 bit signed integers.
## The following configuration setting sets the limit in the size of the
## set in order to use this special memory saving encoding.
## BEGIN MEIZHAOHUI COMMENTS
##   集合仅在一种情况下具有特殊编码：
##   当集合仅由恰好是基数为 10 的整数且范围为 64 位有符号整数的字符串组成时。
## END MEIZHAOHUI COMMENTS
set-max-intset-entries 512

## Similarly to hashes and lists, sorted sets are also specially encoded in
## order to save a lot of space. This encoding is only used when the length and
## elements of a sorted set are below the following limits:
## BEGIN MEIZHAOHUI COMMENTS
##   与哈希和列表类似，有序集合也经过特殊编码，以节省大量空间。
##   只有当有序集合的长度和元素低于以下限制时才使用此编码：
## END MEIZHAOHUI COMMENTS
zset-max-ziplist-entries 128
zset-max-ziplist-value 64

## HyperLogLog sparse representation bytes limit. The limit includes the
## 16 bytes header. When an HyperLogLog using the sparse representation crosses
## this limit, it is converted into the dense representation.
##
## A value greater than 16000 is totally useless, since at that point the
## dense representation is more memory efficient.
##
## The suggested value is ~ 3000 in order to have the benefits of
## the space efficient encoding without slowing down too much PFADD,
## which is O(N) with the sparse encoding. The value can be raised to
## ~ 10000 when CPU is not a concern, but space is, and the data set is
## composed of many HyperLogLogs with cardinality in the 0 - 15000 range.
## BEGIN MEIZHAOHUI COMMENTS
##   hll-sparse-max-bytes用来控制稀疏HyperLogLog结构的最大保存字节数。
##   HyperLogLog是一种用于进行基数估计的数据结构，
##   通过牺牲一定的精确度来减小占用的内存空间。
## END MEIZHAOHUI COMMENTS
hll-sparse-max-bytes 3000

## Streams macro node max size / items. The stream data structure is a radix
## tree of big nodes that encode multiple items inside. Using this configuration
## it is possible to configure how big a single node can be in bytes, and the
## maximum number of items it may contain before switching to a new node when
## appending new stream entries. If any of the following settings are set to
## zero, the limit is ignored, so for instance it is possible to set just a
## max entries limit by setting max-bytes to 0 and max-entries to the desired
## value.
## BEGIN MEIZHAOHUI COMMENTS
##   stream-node-max-bytes参数用于设置stream节点的最大字节数。
##   每个stream节点都是由多个消息组成的，并且每个消息都有一定的字节数。
##   该参数用于限制stream节点的最大字节数，以避免节点过大而导致内存占用过多的问题。
##   stream-node-max-entries参数用于限制一个stream节点（即一个stream所包含的数据的单位）中的最大条目数。
##   默认值为100。当节点中的条目数量达到该限制时，Redis会自动将节点拆分为更小的节点，
##   并创建新的节点来存储后续的条目。
## END MEIZHAOHUI COMMENTS
stream-node-max-bytes 4096
stream-node-max-entries 100

## Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in
## order to help rehashing the main Redis hash table (the one mapping top-level
## keys to values). The hash table implementation Redis uses (see dict.c)
## performs a lazy rehashing: the more operation you run into a hash table
## that is rehashing, the more rehashing "steps" are performed, so if the
## server is idle the rehashing is never complete and some more memory is used
## by the hash table.
##
## The default is to use this millisecond 10 times every second in order to
## actively rehash the main dictionaries, freeing memory when possible.
##
## If unsure:
## use "activerehashing no" if you have hard latency requirements and it is
## not a good thing in your environment that Redis can reply from time to time
## to queries with 2 milliseconds delay.
##
## use "activerehashing yes" if you don't have such hard requirements but
## want to free memory asap when possible.
## BEGIN MEIZHAOHUI COMMENTS
##   active rehashing（主动重哈希）是通过设置activerehashing参数来启用的。
##   active rehashing是一种动态将哈希槽从一个节点转移到另一个节点的机制。
##   在Redis集群中，哈希槽被分配给不同的节点来存储数据。当节点的负载不均衡时，
##   active rehashing可以将一部分哈希槽从负载较高的节点移动到负载较低的节点，
##   以实现负载均衡。这个过程是在运行时进行的，并且是自动执行的。
## END MEIZHAOHUI COMMENTS
activerehashing yes

## The client output buffer limits can be used to force disconnection of clients
## that are not reading data from the server fast enough for some reason (a
## common reason is that a Pub/Sub client can't consume messages as fast as the
## publisher can produce them).
##
## The limit can be set differently for the three different classes of clients:
##
## normal -> normal clients including MONITOR clients
## replica  -> replica clients
## pubsub -> clients subscribed to at least one pubsub channel or pattern
##
## The syntax of every client-output-buffer-limit directive is the following:
##
## client-output-buffer-limit <class> <hard limit> <soft limit> <soft seconds>
##
## A client is immediately disconnected once the hard limit is reached, or if
## the soft limit is reached and remains reached for the specified number of
## seconds (continuously).
## So for instance if the hard limit is 32 megabytes and the soft limit is
## 16 megabytes / 10 seconds, the client will get disconnected immediately
## if the size of the output buffers reach 32 megabytes, but will also get
## disconnected if the client reaches 16 megabytes and continuously overcomes
## the limit for 10 seconds.
##
## By default normal clients are not limited because they don't receive data
## without asking (in a push way), but just after a request, so only
## asynchronous clients may create a scenario where data is requested faster
## than it can read.
##
## Instead there is a default limit for pubsub and replica clients, since
## subscribers and replicas receive data in a push fashion.
##
## Both the hard or the soft limit can be disabled by setting them to zero.

## BEGIN MEIZHAOHUI COMMENTS
##   client-output-buffer-limit参数是用来限制客户端输出缓冲区的大小的。
##   参数的格式为：
##   client-output-buffer-limit <class> <hard limit> <soft limit> <soft seconds>
##   其中，
##   <class>指定了要限制的客户端类型，包括normal、slave、pubsub和replica。
##   <hard-limit>表示客户端输出缓冲区的硬限制大小，单位为字节。当输出缓冲区大小超过这个限制时，客户端将被立即关闭。
##   <soft-limit>表示客户端输出缓冲区的软限制大小，单位为字节。当输出缓冲区大小超过这个限制时，Redis将开始主动丢弃一部分缓冲区中的数据，以避免缓冲区溢出。
##   <soft seconds>表示在达到软限制后，Redis将开始丢弃缓冲区数据的持续时间。以秒为单位进行设置。
## END MEIZHAOHUI COMMENTS
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60

## Client query buffers accumulate new commands. They are limited to a fixed
## amount by default in order to avoid that a protocol desynchronization (for
## instance due to a bug in the client) will lead to unbound memory usage in
## the query buffer. However you can configure it here if you have very special
## needs, such us huge multi/exec requests or alike.
##
## client-query-buffer-limit 1gb

## In the Redis protocol, bulk requests, that are, elements representing single
## strings, are normally limited to 512 mb. However you can change this limit
## here, but must be 1mb or greater
##
## proto-max-bulk-len 512mb

## Redis calls an internal function to perform many background tasks, like
## closing connections of clients in timeout, purging expired keys that are
## never requested, and so forth.
##
## Not all tasks are performed with the same frequency, but Redis checks for
## tasks to perform according to the specified "hz" value.
##
## By default "hz" is set to 10. Raising the value will use more CPU when
## Redis is idle, but at the same time will make Redis more responsive when
## there are many keys expiring at the same time, and timeouts may be
## handled with more precision.
##
## The range is between 1 and 500, however a value over 100 is usually not
## a good idea. Most users should use the default of 10 and raise this up to
## 100 only in environments where very low latency is required.
## BEGIN MEIZHAOHUI COMMENTS
##   Redis 调用内部函数来执行许多后台任务，
##   例如关闭超时的客户端连接、清除从未请求的过期键等等。
##
##   并非所有任务都以相同的频率执行，但 Redis 会根据指定的"hz"值检查要执行的任务。
##
##   默认情况下，"hz"设置为 10。当 Redis 空闲时，提高该值将使用更多 CPU，
##   但同时当有许多键同时过期时，Redis 的响应速度会更快，并且可以更精确地处理超时。
##
##   该参数范围在 1 到 500 之间，但超过 100 的值是不推荐的。
##   大多数用户应该使用默认值 10，并仅在需要非常低延迟的环境中将其提高到 100。
##   默认的HZ值为10，表示每秒进行10次的定时任务检查。
## END MEIZHAOHUI COMMENTS
hz 10

## Normally it is useful to have an HZ value which is proportional to the
## number of clients connected. This is useful in order, for instance, to
## avoid too many clients are processed for each background task invocation
## in order to avoid latency spikes.
##
## Since the default HZ value by default is conservatively set to 10, Redis
## offers, and enables by default, the ability to use an adaptive HZ value
## which will temporarily raise when there are many connected clients.
##
## When dynamic HZ is enabled, the actual configured HZ will be used
## as a baseline, but multiples of the configured HZ value will be actually
## used as needed once more clients are connected. In this way an idle
## instance will use very little CPU time while a busy instance will be
## more responsive.
## BEGIN MEIZHAOHUI COMMENTS
##   dynamic-hz用于控制Redis是否动态调整服务器的心跳频率。
##   心跳频率是Redis服务器在非阻塞状态下执行任务的速率。
##   在每次循环中，服务器都会操纵定时器（用于计算心跳）。
##   dynamic-hz参数允许Redis根据服务器的负载动态地调整心跳频率。
##   如果dynamic-hz被设置为yes，Redis将根据服务器的负载情况自动调整心跳频率。
##   具体来说，如果服务器忙碌并且使用率较高，Redis会增加心跳频率以提高响应速度。
##   相反，如果服务器处于空闲状态，Redis会降低心跳频率以节省资源。
## END MEIZHAOHUI COMMENTS
dynamic-hz yes

## When a child rewrites the AOF file, if the following option is enabled
## the file will be fsync-ed every 32 MB of data generated. This is useful
## in order to commit the file to the disk more incrementally and avoid
## big latency spikes.
## BEGIN MEIZHAOHUI COMMENTS
##   aof-rewrite-incremental-fsync参数用于控制重写过程中自动执行fsync的频率。
##   fsync是一个用于将数据写入磁盘的系统调用，它确保数据写入磁盘后才返回。
##   然而，频繁的执行fsync操作会导致性能下降。
##   aof-rewrite-incremental-fsync参数接受以下值：
##   yes：表示在AOF重写期间会自动执行fsync操作。这是默认值，可以确保AOF文件的安全性，但可能会影响性能。
##   no：表示在AOF重写期间不执行fsync操作。这样可以提高性能，但可能会增加数据丢失的风险。
## END MEIZHAOHUI COMMENTS
aof-rewrite-incremental-fsync yes

## When redis saves RDB file, if the following option is enabled
## the file will be fsync-ed every 32 MB of data generated. This is useful
## in order to commit the file to the disk more incrementally and avoid
## big latency spikes.
## BEGIN MEIZHAOHUI COMMENTS
##   rdb-save-incremental-fsync参数用于控制是否在进行RDB持久化时进行增量fsync操作。
##   RDB持久化是将Redis的内存数据以二进制格式写入磁盘文件，以保证数据在重启时的持久性。
##   在默认情况下，Redis会在进行RDB持久化时执行一个完整的fsync操作，将数据强制刷写到磁盘上。
##   但是，完整的fsync操作可能会导致一定的性能损失，特别是在写入大量数据时。
##   为了减轻这种性能损失，Redis 6引入了rdb-save-incremental-fsync参数。
##   默认情况下，rdb-save-incremental-fsync参数的值为yes，表示在进行RDB持久化时进行增量fsync操作。
##   增量fsync操作只会将数据写入磁盘的文件系统缓存中，并不会马上将数据刷写到磁盘上。
##   这种方式可以提高性能，但是可能会增加数据丢失的风险，在发生宕机的情况下可能会有一定的数据丢失。
## END MEIZHAOHUI COMMENTS
rdb-save-incremental-fsync yes

## Redis LFU eviction (see maxmemory setting) can be tuned. However it is a good
## idea to start with the default settings and only change them after investigating
## how to improve the performances and how the keys LFU change over time, which
## is possible to inspect via the OBJECT FREQ command.
##
## There are two tunable parameters in the Redis LFU implementation: the
## counter logarithm factor and the counter decay time. It is important to
## understand what the two parameters mean before changing them.
##
## The LFU counter is just 8 bits per key, it's maximum value is 255, so Redis
## uses a probabilistic increment with logarithmic behavior. Given the value
## of the old counter, when a key is accessed, the counter is incremented in
## this way:
##
## 1. A random number R between 0 and 1 is extracted.
## 2. A probability P is calculated as 1/(old_value*lfu_log_factor+1).
## 3. The counter is incremented only if R < P.
##
## The default lfu-log-factor is 10. This is a table of how the frequency
## counter changes with a different number of accesses with different
## logarithmic factors:
##
## +--------+------------+------------+------------+------------+------------+
## | factor | 100 hits   | 1000 hits  | 100K hits  | 1M hits    | 10M hits   |
## +--------+------------+------------+------------+------------+------------+
## | 0      | 104        | 255        | 255        | 255        | 255        |
## +--------+------------+------------+------------+------------+------------+
## | 1      | 18         | 49         | 255        | 255        | 255        |
## +--------+------------+------------+------------+------------+------------+
## | 10     | 10         | 18         | 142        | 255        | 255        |
## +--------+------------+------------+------------+------------+------------+
## | 100    | 8          | 11         | 49         | 143        | 255        |
## +--------+------------+------------+------------+------------+------------+
##
## NOTE: The above table was obtained by running the following commands:
##
##   redis-benchmark -n 1000000 incr foo
##   redis-cli object freq foo
##
## NOTE 2: The counter initial value is 5 in order to give new objects a chance
## to accumulate hits.
##
## The counter decay time is the time, in minutes, that must elapse in order
## for the key counter to be divided by two (or decremented if it has a value
## less <= 10).
##
## The default value for the lfu-decay-time is 1. A special value of 0 means to
## decay the counter every time it happens to be scanned.
##
## lfu-log-factor 10
## lfu-decay-time 1

############################ ACTIVE DEFRAGMENTATION #######################
##
## What is active defragmentation?
## -------------------------------
##
## Active (online) defragmentation allows a Redis server to compact the
## spaces left between small allocations and deallocations of data in memory,
## thus allowing to reclaim back memory.
##
## Fragmentation is a natural process that happens with every allocator (but
## less so with Jemalloc, fortunately) and certain workloads. Normally a server
## restart is needed in order to lower the fragmentation, or at least to flush
## away all the data and create it again. However thanks to this feature
## implemented by Oran Agra for Redis 4.0 this process can happen at runtime
## in a "hot" way, while the server is running.
##
## Basically when the fragmentation is over a certain level (see the
## configuration options below) Redis will start to create new copies of the
## values in contiguous memory regions by exploiting certain specific Jemalloc
## features (in order to understand if an allocation is causing fragmentation
## and to allocate it in a better place), and at the same time, will release the
## old copies of the data. This process, repeated incrementally for all the keys
## will cause the fragmentation to drop back to normal values.
##
## Important things to understand:
##
## 1. This feature is disabled by default, and only works if you compiled Redis
##    to use the copy of Jemalloc we ship with the source code of Redis.
##    This is the default with Linux builds.
##
## 2. You never need to enable this feature if you don't have fragmentation
##    issues.
##
## 3. Once you experience fragmentation, you can enable this feature when
##    needed with the command "CONFIG SET activedefrag yes".
##
## The configuration parameters are able to fine tune the behavior of the
## defragmentation process. If you are not sure about what they mean it is
## a good idea to leave the defaults untouched.

## Enabled active defragmentation
## activedefrag no

## Minimum amount of fragmentation waste to start active defrag
## active-defrag-ignore-bytes 100mb

## Minimum percentage of fragmentation to start active defrag
## active-defrag-threshold-lower 10

## Maximum percentage of fragmentation at which we use maximum effort
## active-defrag-threshold-upper 100

## Minimal effort for defrag in CPU percentage, to be used when the lower
## threshold is reached
## active-defrag-cycle-min 1

## Maximal effort for defrag in CPU percentage, to be used when the upper
## threshold is reached
## active-defrag-cycle-max 25

## Maximum number of set/hash/zset/list fields that will be processed from
## the main dictionary scan
## active-defrag-max-scan-fields 1000

## Jemalloc background thread for purging will be enabled by default
## BEGIN MEIZHAOHUI COMMENTS
##   jemalloc-bg-thread 参数是一个用于控制 jemalloc 后台线程行为的选项。
##   jemalloc 是一个用于 Redis 内存分配的开源库，它的主要特点是支持多线程内存分配，
##   可以提高 Redis 的并发性能。
##   jemalloc-bg-thread 参数的默认值是 yes，它表示启用 jemalloc 后台线程。
##   这个后台线程主要用于处理 jemalloc 的内存处理任务，
##   例如内存碎片整理、内存归还等，它可以在后台异步地执行这些任务，
##   避免阻塞 Redis 的主线程。
##   当发生写入删除操作时，jemalloc 可能会产生一些内存碎片。
##   这些内存碎片会导致 Redis 的内存使用效率下降。
##   启用 jemalloc-bg-thread 可以定期对这些内存碎片进行整理，提高 Redis 的内存使用效率。
## END MEIZHAOHUI COMMENTS
jemalloc-bg-thread yes

## It is possible to pin different threads and processes of Redis to specific
## CPUs in your system, in order to maximize the performances of the server.
## This is useful both in order to pin different Redis threads in different
## CPUs, but also in order to make sure that multiple Redis instances running
## in the same host will be pinned to different CPUs.
##
## Normally you can do this using the "taskset" command, however it is also
## possible to this via Redis configuration directly, both in Linux and FreeBSD.
##
## You can pin the server/IO threads, bio threads, aof rewrite child process, and
## the bgsave child process. The syntax to specify the cpu list is the same as
## the taskset command:
##
## Set redis server/io threads to cpu affinity 0,2,4,6:
## server_cpulist 0-7:2
##
## Set bio threads to cpu affinity 1,3:
## bio_cpulist 1,3
##
## Set aof rewrite child process to cpu affinity 8,9,10,11:
## aof_rewrite_cpulist 8-11
##
## Set bgsave child process to cpu affinity 1,10,11
## bgsave_cpulist 1,10-11

## In some cases redis will emit warnings and even refuse to start if it detects
## that the system is in bad state, it is possible to suppress these warnings
## by setting the following config which takes a space delimited list of warnings
## to suppress
##
## ignore-warnings ARM64-COW-BUG