背景：最近在对一新开发Springboot系统做压测，发现刚开始压测时，可以正常对redis集群进行数据存取，但是暂停几分钟后，接着继续用jmeter进行压测时，发现redis就开始突然疯狂爆出异常提示：Command timed out after 6 second(s)......
1 Caused by: io.lettuce.core.RedisCommandTimeoutException: Command timed out after 6 second(s) 2 at io.lettuce.core.ExceptionFactory.createTimeoutException(ExceptionFactory.java:51) 3 at io.lettuce.core.LettuceFutures.awaitOrCancel(LettuceFutures.java:114) 4 at io.lettuce.core.cluster.ClusterFutureSyncInvocationHandler.handleInvocation(ClusterFutureSyncInvocationHandler.java:123) 5 at io.lettuce.core.internal.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:80) 6 at com.sun.proxy.$Proxy134.mget(Unknown Source) 7 at org.springframework.data.redis.connection.lettuce.LettuceStringCommands.mGet(LettuceStringCommands.java:119) 8 ... 15 common frames omitted