打开了TM的debug日志后发现很多这种日志： Responding with error: class org.apache.flink.runtime.io.network.partition.PartitionNotFoundException
目前问题的直观表现是：提交任务后，一直报 LocalTransportException： org.apache.flink.runtime.io.network.netty.exception.LocalTransportException: Sending the partition request to '/10.216.187.171:8709 (#0)' failed. at org.apache.flink.runtime.io.network.netty.NettyPartitionRequestClient$1.operationComplete(NettyPartitionRequestClient.java:145) at org.apache.flink.runtime.io.network.netty.NettyPartitionRequestClient$1.operationComplete(NettyPartitionRequestClient.java:133) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:552) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:491) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:616) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:609) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:117) at org.apache.flink.shaded.netty4.io.netty.channel.AbstractChannel$AbstractUnsafe.safeSetFailure(AbstractChannel.java:1017) at org.apache.flink.shaded.netty4.io.netty.channel.AbstractChannel$AbstractUnsafe.write(AbstractChannel.java:878) at org.apache.flink.shaded.netty4.io.netty.channel.DefaultChannelPipeline$HeadContext.write(DefaultChannelPipeline.java:1367) at org.apache.flink.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717) at org.apache.flink.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764) at org.apache.flink.shaded.netty4.io.netty.channel.AbstractChannelHandlerContext$WriteTask.run(AbstractChannelHandlerContext.java:1071) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469) at org.apache.flink.shaded.netty4.io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:384) at org.apache.flink.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) at org.apache.flink.shaded.netty4.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) at java.lang.Thread.run(Thread.java:748) Caused by: org.apache.flink.shaded.netty4.io.netty.channel.StacklessClosedChannelException at org.apache.flink.shaded.netty4.io.netty.channel.AbstractChannel$AbstractUnsafe.write(Object, ChannelPromise)(Unknown Source) 不清楚和debug的那个日志是否有关呢？ 然后都是什么原因呢这个问题，之前一直怀疑是网络原因，一直也不知道啥原因。今天开了debug才发现有这么个debug报错。
