问题场景
程序调用redis集群，总是间歇性地提示报错，报错提示如下：
org.springframework.data.redis.RedisSystemException: Error in execution; nested exception is io.lettuce.core.RedisCommandExecutionException: CLUSTERDOWN The cluster is down
at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:54)
at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:52)
at org.springframework.data.redis.connection.lettuce.LettuceExceptionConverter.convert(LettuceExceptionConverter.java:41)
at org.springframework.data.redis.PassThroughExceptionTranslationStrategy.translate(PassThroughExceptionTranslationStrategy.java:44)
at org.springframework.data.redis.FallbackExceptionTranslationStrategy.translate(FallbackExceptionTranslationStrategy.java:42)
at org.springframework.data.redis.connection.lettuce.LettuceConnection.convertLettuceAccessException(LettuceConnection.java:268)
at org.springframework.data.redis.connection.lettuce.LettuceStringCommands.convertLettuceAccessException(LettuceStringCommands.java:799)
at org.springframework.data.redis.connection.lettuce.LettuceStringCommands.set(LettuceStringCommands.java:180)
at org.springframework.data.redis.connection.DefaultedRedisConnection.set(DefaultedRedisConnection.java:281)
at org.springframework.data.redis.connection.DefaultStringRedisConnection.set(DefaultStringRedisConnection.java:955)
at org.springframework.data.redis.core.DefaultValueOperations.lambda$setIfAbsent$11(DefaultValueOperations.java:310)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:224)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:184)
at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:95)
at org.springframework.data.redis.core.DefaultValueOperations.setIfAbsent(DefaultValueOperations.java:310)
本篇博文主要是讲述问题发生的原因及解决方案。
问题环境
| 软件 | 版本 |
|---|---|
| redis | 5 |
问题原因
通过查看日志，发现有从节点的同步存在问题，报错提示如下：
207636:S 04 Mar 2021 21:31:19.986 * Connecting to MASTER test:6379
207636:S 04 Mar 2021 21:31:19.986 * MASTER <-> REPLICA sync started
207636:S 04 Mar 2021 21:31:19.986 * Non blocking connect for SYNC fired the event.
207636:S 04 Mar 2021 21:31:19.986 * Master replied to PING, replication can continue...
207636:S 04 Mar 2021 21:31:19.986 * (Non critical) Master does not understand REPLCONF listening-port: -NOAUTH Authentication required.
207636:S 04 Mar 2021 21:31:19.986 * (Non critical) Master does not understand REPLCONF capa: -NOAUTH Authentication required.
207636:S 04 Mar 2021 21:31:19.986 * Partial resynchronization not possible (no cached master)
207636:S 04 Mar 2021 21:31:19.987 # Unexpected reply to PSYNC from master: -NOAUTH Authentication required.
207636:S 04 Mar 2021 21:31:19.987 * Retrying with SYNC...
207636:S 04 Mar 2021 21:31:19.987 # MASTER aborted replication with an error: NOAUTH Authentication required.
查看关键字：NOAUTH Authentication required。是因为配置了密码保护，但是配置没有弄好，导致主从节点同步数据存在问题。
解决方案
在配置文件里面加上以下配置：
masterauth ${设置的密码}
然后重新启动redis集群。
结果
异常消失，问题得到解决。
总结
配置之间存在关联，需要多检查。
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