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有个flink实时任务，上周升级了版本，早上过来看下任务，发现任务凌晨4点左右的时候重启了。flink ui查看异常日志如下
异常日志
2020-08-10 04:07:23
org.apache.flink.runtime.ioworkty.exception.RemoteTransportException: Connection unexpectedly closed by remote task manager '/9.150.12.175:39365'. This might indicate that the remote task manager was lost.
at org.apache.flink.runtime.ioworkty.CreditBasedPartitionRequestClientHandler.channelInactive(CreditBasedPartitionRequestClientHandler.java:136)
at org.apache.flink.shadedty4.ioty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:245)
at org.apache.flink.shadedty4.ioty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:231)
at org.apache.flink.shadedty4.ioty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:224)
at org.apache.flink.shadedty4.ioty.handler.codec.ByteToMessageDecoder.channelInputClosed(ByteToMessageDecoder.java:390)
at org.apache.flink.shadedty4.ioty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:355)
at org.apache.flink.shadedty4.ioty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:245)
at org.apache.flink.shadedty4.ioty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:231)
at org.apache.flink.shadedty4.ioty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:224)
at org.apache.flink.shadedty4.ioty.channel.DefaultChannelPipeline$HeadContext.channelInactive(DefaultChannelPipeline.java:1429)
at org.apache.flink.shadedty4.ioty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:245)
at org.apache.flink.shadedty4.ioty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:231)
at org.apache.flink.shadedty4.ioty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:947)
at org.apache.flink.shadedty4.ioty.channel.AbstractChannel$AbstractUnsafe$8.run(AbstractChannel.java:826)
at org.apache.flink.shadedty4.ioty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at org.apache.flink.shadedty4.ioty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
at org.apache.flink.shadedty4.ioty.channel.nio.NioEventLoop.run(NioEventLoop.java:474)
at org.apache.flink.shadedty4.ioty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:909)
at java.lang.Thread.run(Thread.java:748)
关键信息
2020-08-10 04:07:23
org.apache.flink.runtime.ioworkty.exception.RemoteTransportException: Connection unexpectedly closed by remote task manager '/9.150.12.175:39365'. This might indicate that the remote task manager was lost.
初步判断可能是9.150.12.175机器出了问题。
看看yarn资源管理界面，进一步判断是机器问题。
一般常见的是内存不足、磁盘空间不足，或者其他问题。
登陆问题机器，jps查看进程，只有yarn nodemanager还在，但启动时间还是很早之前，没有重启过，其他任务已经被干掉了
查看yarn nodemanager日志，日志提示磁盘使用率超过90%
查看当前磁盘使用率
跟yarn的日志一致，磁盘使用率超过yarn的配置阀值。查看日志，有历史生成的大日志文件，清理过期日志，重新启动，任务重新分配到问题机器，一切恢复正常。同时让运维同事将所有集群节点磁盘加上监控，使用率达到85%时告警。
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