记录redis集群连接超时问题及解决方案

下午同事反馈，某业务场景性能测试过程中，出现异常，提供日志报： Redis command timed out

1. 先看下日志

org.springframework.dao.QueryTimeoutException: Redis command timed out; nested exception is io.lettuce.core.RedisCommandTimeoutException: Command timed out after 1 minute(s)

    at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:70) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:41) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.PassThroughExceptionTranslationStrategy.translate(PassThroughExceptionTranslationStrategy.java:44) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.FallbackExceptionTranslationStrategy.translate(FallbackExceptionTranslationStrategy.java:42) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.connection.lettuce.LettuceConnection.convertLettuceAccessException(LettuceConnection.java:271) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.connection.lettuce.LettuceConnection.await(LettuceConnection.java:1062) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.connection.lettuce.LettuceConnection.lambda$doInvoke$4(LettuceConnection.java:919) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.connection.lettuce.LettuceInvoker$Synchronizer.invoke(LettuceInvoker.java:665) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.connection.lettuce.LettuceInvoker.just(LettuceInvoker.java:94) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.connection.lettuce.LettuceSetCommands.sMembers(LettuceSetCommands.java:149) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.connection.DefaultedRedisConnection.sMembers(DefaultedRedisConnection.java:805) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.core.DefaultSetOperations.lambda$members$10(DefaultSetOperations.java:214) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:222) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:189) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:96) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.core.DefaultSetOperations.members(DefaultSetOperations.java:214) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.data.redis.core.DefaultBoundSetOperations.members(DefaultBoundSetOperations.java:152) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    at org.springframework.session.data.redis.RedisSessionExpirationPolicy.cleanExpiredSessions(RedisSessionExpirationPolicy.java:132) ~[spring-session-data-redis-2.5.6.jar!/:2.5.6]

    at org.springframework.session.data.redis.RedisIndexedSessionRepository.cleanupExpiredSessions(RedisIndexedSessionRepository.java:424) ~[spring-session-data-redis-2.5.6.jar!/:2.5.6]

    at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) ~[spring-context-5.3.20.jar!/:5.3.20]

    at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:95) [spring-context-5.3.20.jar!/:5.3.20]

    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_191]

    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_191]

    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_191]

    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_191]

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191]

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191]

    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]

Caused by: io.lettuce.core.RedisCommandTimeoutException: Command timed out after 1 minute(s)

    at io.lettuce.core.internal.ExceptionFactory.createTimeoutException(ExceptionFactory.java:59) ~[lettuce-core-6.1.8.RELEASE.jar!/:6.1.8.RELEASE]

    at io.lettuce.core.internal.Futures.awaitOrCancel(Futures.java:246) ~[lettuce-core-6.1.8.RELEASE.jar!/:6.1.8.RELEASE]

    at io.lettuce.core.LettuceFutures.awaitOrCancel(LettuceFutures.java:74) ~[lettuce-core-6.1.8.RELEASE.jar!/:6.1.8.RELEASE]

    at org.springframework.data.redis.connection.lettuce.LettuceConnection.await(LettuceConnection.java:1060) ~[spring-data-redis-2.5.11.jar!/:2.5.11]

    ... 22 common frames omitted

2022-09-15 15:31:00.427  INFO 16828 --- [xecutorLoop-1-3] i.l.core.protocol.ConnectionWatchdog     : Reconnecting, last destination was 192.168.0.163:6692

2022-09-15 15:31:00.427  INFO 16828 --- [xecutorLoop-1-2] i.l.core.protocol.ConnectionWatchdog     : Reconnecting, last destination was 192.168.0.163:6692

2022-09-15 15:31:00.428  WARN 16828 --- [ioEventLoop-8-4] i.l.core.protocol.ConnectionWatchdog     : Cannot reconnect to [192.168.0.163:6692]: Connection refused: /192.168.0.163:6692

2022-09-15 15:31:00.429  WARN 16828 --- [ioEventLoop-8-5] i.l.core.protocol.ConnectionWatchdog     : Cannot reconnect to [192.168.0.163:6692]: Connection refused: /192.168.0.163:6692

2022-09-15 15:31:00.606  INFO 16828 --- [xecutorLoop-4-7] i.l.core.protocol.ConnectionWatchdog     : Reconnecting, last destination was 192.168.0.163:6692

2022-09-15 15:31:00.608  WARN 16828 --- [ioEventLoop-9-3] i.l.core.protocol.ConnectionWatchdog     : Cannot reconnect to [192.168.0.163:6692]: Connection refused: /192.168.0.163:6692

2022-09-15 15:31:30.527  INFO 16828 --- [xecutorLoop-1-6] i.l.core.protocol.ConnectionWatchdog     : Reconnecting, last destination was 192.168.0.163:6692

2022-09-15 15:31:30.527  INFO 16828 --- [xecutorLoop-1-7] i.l.core.protocol.ConnectionWatchdog     : Reconnecting, last destination was 192.168.0.163:6692

2022-09-15 15:31:30.530  WARN 16828 --- [ioEventLoop-8-7] i.l.core.protocol.ConnectionWatchdog     : Cannot reconnect to [192.168.0.163:6692]: Connection refused: /192.168.0.163:6692

2022-09-15 15:31:30.532  WARN 16828 --- [ioEventLoop-8-6] i.l.core.protocol.ConnectionWatchdog     : Cannot reconnect to [192.168.0.163:6692]: Connection refused: /192.168.0.163:6692

2022-09-15 15:31:30.706  INFO 16828 --- [xecutorLoop-4-8] i.l.core.protocol.ConnectionWatchdog     : Reconnecting, last destination was 192.168.0.163:6692

2022-09-15 15:31:30.714  WARN 16828 --- [ioEventLoop-9-4] i.l.core.protocol.ConnectionWatchdog     : Cannot reconnect to [192.168.0.163:6692]: Connection refused: /192.168.0.163:6692

2022-09-15 15:32:00.627  INFO 16828 --- [xecutorLoop-1-2] i.l.core.protocol.ConnectionWatchdog     : Reconnecting, last destination was 192.168.0.163:6692

2022-09-15 15:32:00.627  INFO 16828 --- [xecutorLoop-1-4] i.l.core.protocol.ConnectionWatchdog     : Reconnecting, last destination was 192.168.0.163:6692

从日志可以看出：Cannot reconnect to [192.168.0.163:6692]: Connection refused: /192.168.0.163:6692

*********************************************************************************************************************************************************************************************

2. 登入redis集群服务器看下redis服务状态

[root@iZ2ze0gm3scdypc0i15r8yZ redis-cluster]# ps -ef|grep redis

root      1718     1 78 09:36 ?        04:49:50 ./redis-server *:6695 [cluster]

root      1723     1 36 09:36 ?        02:12:52 ./redis-server *:6693 [cluster]

root      1724     1 94 09:36 ?        05:49:34 ./redis-server *:6694 [cluster]

root      1726     1 94 09:36 ?        05:48:41 ./redis-server *:6696 [cluster]

root      1727     1 35 09:36 ?        02:12:15 ./redis-server *:6691 [cluster]

root      2426     1  0 09:48 ?        00:01:16 ./redis-server *:6379

root     22212 22111  0 15:44 pts/4    00:00:00 grep --color=auto redis

可以看出，6692端口的redis节点挂掉了。为什么会挂掉？

*********************************************************************************************************************************************************************************************

3. 先把6692端口对应的redis节点启动，看下内存

[root@iZ2ze0gm3scdypc0i15r8yZ redis-cluster]# ./redis-cli -h 192.168.0.163 -p 6692 -c -a Tiye@123!

Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.

192.168.0.163:6692> info memory

# Memory

used_memory:5255993312

used_memory_human:4.90G

used_memory_rss:6011609088

used_memory_rss_human:5.60G

used_memory_peak:5255993312

used_memory_peak_human:4.90G

used_memory_peak_perc:100.00%

used_memory_overhead:23434632

used_memory_startup:1483784

used_memory_dataset:5232558680

used_memory_dataset_perc:99.58%

allocator_allocated:5225666392

allocator_active:6178586624

allocator_resident:6227939328

total_system_memory:33020043264

total_system_memory_human:30.75G

used_memory_lua:32768

used_memory_lua_human:32.00K

used_memory_scripts:0

used_memory_scripts_human:0B

number_of_cached_scripts:0

maxmemory:0

maxmemory_human:0B

maxmemory_policy:noeviction

allocator_frag_ratio:1.18

allocator_frag_bytes:952920232

allocator_rss_ratio:1.01

allocator_rss_bytes:49352704

rss_overhead_ratio:0.97

rss_overhead_bytes:-216330240

mem_fragmentation_ratio:1.15

mem_fragmentation_bytes:786011688

mem_not_counted_for_evict:0

mem_replication_backlog:0

mem_clients_slaves:0

mem_clients_normal:0

mem_aof_buffer:0

mem_allocator:jemalloc-5.1.0

active_defrag_running:0

lazyfree_pending_objects:0

lazyfreed_objects:0

从6692节点的redis内存可看出，内存已达到最大值：4.9G，内存占用率为100%，这是该节点挂掉的原因。

*********************************************************************************************************************************************************************************************

4. 再来看看6691、6693两个节点的内存使用情况

[root@iZ2ze0gm3scdypc0i15r8yZ redis-cluster]# ./redis-cli -h 192.168.0.163 -p 6691 -c -a Tiye@123!

Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.

192.168.0.163:6691> info memory

# Memory

used_memory:312651792

used_memory_human:298.17M

used_memory_rss:317714432

used_memory_rss_human:303.00M

used_memory_peak:313941360

used_memory_peak_human:299.40M

used_memory_peak_perc:99.59%

used_memory_overhead:38853632

used_memory_startup:1483784

used_memory_dataset:273798160

used_memory_dataset_perc:87.99%

allocator_allocated:312643776

allocator_active:313520128

allocator_resident:322052096

total_system_memory:33020043264

total_system_memory_human:30.75G

used_memory_lua:32768

used_memory_lua_human:32.00K

used_memory_scripts:0

used_memory_scripts_human:0B

number_of_cached_scripts:0

maxmemory:0

maxmemory_human:0B

maxmemory_policy:noeviction

allocator_frag_ratio:1.00

allocator_frag_bytes:876352

allocator_rss_ratio:1.03

allocator_rss_bytes:8531968

rss_overhead_ratio:0.99

rss_overhead_bytes:-4337664

mem_fragmentation_ratio:1.02

mem_fragmentation_bytes:5103624

mem_not_counted_for_evict:0

mem_replication_backlog:0

mem_clients_slaves:0

mem_clients_normal:841560

mem_aof_buffer:0

mem_allocator:jemalloc-5.1.0

active_defrag_running:0

lazyfree_pending_objects:0

lazyfreed_objects:0

[root@iZ2ze0gm3scdypc0i15r8yZ redis-cluster]# ./redis-cli -h 192.168.0.163 -p 6693 -c -a Tiye@123!

Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.

192.168.0.163:6693> info memory

# Memory

used_memory:313492000

used_memory_human:298.97M

used_memory_rss:318951424

used_memory_rss_human:304.18M

used_memory_peak:314344552

used_memory_peak_human:299.78M

used_memory_peak_perc:99.73%

used_memory_overhead:38814608

used_memory_startup:1483784

used_memory_dataset:274677392

used_memory_dataset_perc:88.04%

allocator_allocated:313483968

allocator_active:314449920

allocator_resident:322850816

total_system_memory:33020043264

total_system_memory_human:30.75G

used_memory_lua:32768

used_memory_lua_human:32.00K

used_memory_scripts:0

used_memory_scripts_human:0B

number_of_cached_scripts:0

maxmemory:0

maxmemory_human:0B

maxmemory_policy:noeviction

allocator_frag_ratio:1.00

allocator_frag_bytes:965952

allocator_rss_ratio:1.03

allocator_rss_bytes:8400896

rss_overhead_ratio:0.99

rss_overhead_bytes:-3899392

mem_fragmentation_ratio:1.02

mem_fragmentation_bytes:5500440

mem_not_counted_for_evict:0

mem_replication_backlog:0

mem_clients_slaves:0

mem_clients_normal:821056

mem_aof_buffer:0

mem_allocator:jemalloc-5.1.0

active_defrag_running:0

lazyfree_pending_objects:0

lazyfreed_objects:0

6691、6693两个节点的redis内存占用率也达到了99%以上，但是实际使用内存不超过300M，redis内存在集群内没有做到均衡

*********************************************************************************************************************************************************************************************

5. redis超时问题解决办法

redis超时问题的解决办法：清除6691、6692、6693这三个主节点的缓存。不过，这只是个临时的解决方案。

[root@iZ2ze0gm3scdypc0i15r8yZ redis-cluster]# ./redis-cli -h 192.168.0.163 -p 6691 -c -a Tiye@123!
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.0.163:6691> flushall
OK

*********************************************************************************************************************************************************************************************

6. 目前问题及个人认为的最佳解决方案

6.1 目前存在两个问题

　　①redis内存消耗没有在集群内部达到均衡；②重启redis服务，缓存没有清除。

6.2 个人认为的最佳解决方案

　　查看redis.conf配置文件，最大内存配置（ redis.conf默认配置）为：# maxmemory <bytes>

　　redis服务器总内存大小为32G，根据经验（之前在上海的某个项目，设置maxmemory为固定值，集群内部所有节点的内存消耗均衡），可以给6个redis节点都分配4G内存。即： maxmemory 4096M

重启redis集群。

***************后续待观察，redis集群最大内存是否达到均衡，redis服务是否还会挂掉*************************

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记录redis集群连接超时问题及解决方案

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