今天早上发现公司项目进不去了，报 502 错误，于是直接访问后端，发现后端崩了，提示 MISCONF Redis is configured to save RDB snapshots 错误，完整的错误如下。
2022-09-08 05:26:16.039 ERROR 5380 --- [redisson-timer-4-1] o.r.c.handler.PingConnectionHandler : Unable to send PING command over channel: [id: 0x05f63864, L:/127.0.0.1:56261 - R:127.0.0.1/127.0.0.1:6379] org.redisson.client.RedisException: MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error.. channel: [id: 0x05f63864, L:/127.0.0.1:56261 - R:127.0.0.1/127.0.0.1:6379] command: (PING), promise: java.util.concurrent.CompletableFuture@22817c3c[Not completed, 1 dependents], params: [] at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:370) ~[redisson-3.17.5.jar:3.17.5] at org.redisson.client.handler.CommandDecoder.decodeCommand(CommandDecoder.java:198) ~[redisson-3.17.5.jar:3.17.5] at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:137) ~[redisson-3.17.5.jar:3.17.5] at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:113) ~[redisson-3.17.5.jar:3.17.5] at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:510) ~[netty-codec-4.1.79.Final.jar:4.1.79.Final] at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366) ~[netty-codec-4.1.79.Final.jar:4.1.79.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:279) ~[netty-codec-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:722) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496) ~[netty-transport-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.79.Final.jar:4.1.79.Final] at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
于是我看了眼任务管理器,一切正常，甚至还很空。
Spring 日志里有这样的错误大概 100 多份，简单翻译了下才发现，是硬盘满了，于是…
接着赶紧到项目文件夹查看，是什么文件这么占内存。
原来是企业微信的会话存档，塞满了整个服务器硬盘，甚至还不够用。
原因是营销部门的同事在经销商群里发大文件，然后我的 OA 项目把这些文件都拉了下来。
于是我将大于 2GB 的文件进行删除，保证服务器硬盘有足够的存储空间，接着重启服务器。
重启后，把各个前后端项目逐个启动，最后一切正常！
幸好发现得早，要是上班了才发现，就会对公司员工造成影响了…
所以起个早还是挺好的…
