早上來到公司，線上的專案報錯：

Error in execution; nested exception is io.lettuce.core.RedisCommandExecutionException: MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if
 
 RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
org.springframework.data.redis.RedisSystemException: Error in execution; nested exception is io.lettuce.core.RedisCommandExecutionException: MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. Commands that may modify the data set are disabled, because 
 
this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
    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:257)
    at org.springframework.data.redis.connection.lettuce.LettuceHashCommands.convertLettuceAccessException(LettuceHashCommands.java:445)
    at org.springframework.data.redis.connection.lettuce.LettuceHashCommands.hSet(LettuceHashCommands.java:70)
    at org.springframework.data.redis.connection.DefaultedRedisConnection.hSet(DefaultedRedisConnection.java:827)
    at org.springframework.data.redis.connection.DefaultStringRedisConnection.hSet(DefaultStringRedisConnection.java:501)
    at org.springframework.data.redis.core.DefaultHashOperations.lambda$put$8(DefaultHashOperations.java:178)
    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:224)
    at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:184)
    at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:95)
    at org.springframework.data.redis.core.DefaultHashOperations.put(DefaultHashOperations.java:177)
    at com.app.cache.RedisCacheUtils.hset(RedisCacheUtils.java:105)
    at com.app.user.config.ConsumerRedisListener.sendMessageToUser(ConsumerRedisListener.java:494)
    at com.app.user.config.ConsumerRedisListener.doBusiness(ConsumerRedisListener.java:108)
    at com.app.user.config.ConsumerRedisListener.onMessage(ConsumerRedisListener.java:81)
    at org.springframework.data.redis.listener.RedisMessageListenerContainer.executeListener(RedisMessageListenerContainer.java:250)
    at org.springframework.data.redis.listener.RedisMessageListenerContainer.processMessage(RedisMessageListenerContainer.java:240)
    at org.springframework.data.redis.listener.RedisMessageListenerContainer.lambda$dispatchMessage$0(RedisMessageListenerContainer.java:986)
    at java.lang.Thread.run(Thread.java:748)
Caused by: io.lettuce.core.RedisCommandExecutionException: MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
    at io.lettuce.core.protocol.AsyncCommand.completeResult(AsyncCommand.java:118)
    at io.lettuce.core.protocol.AsyncCommand.complete(AsyncCommand.java:109)
    at io.lettuce.core.protocol.CommandWrapper.complete(CommandWrapper.java:57)
    at io.lettuce.core.protocol.CommandHandler.complete(CommandHandler.java:598)
    at io.lettuce.core.protocol.CommandHandler.decode(CommandHandler.java:556)
    at io.lettuce.core.protocol.CommandHandler.channelRead(CommandHandler.java:508)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
    at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:808)
    at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:408)
    at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:308)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    ... 1 common frames omitted

 趕緊連線伺服器看下問題，瑪德，伺服器都連不上，第一反應，伺服器掛了，快取掛了，解決方法：找運維重啟伺服器，重啟快取，ok，搞定。