为什么canal server会经常报这个错误，我看client端一直在消费。

环境信息

Linux --centos 7.4

canal version 1.0.24 mysql version 5.7.22

问题描述

2018-12-21 11:24:58.269 [New I/O server worker #1-10] ERROR c.a.otter.canal.server.netty.handler.SessionHandler - something goes wrong with channel:[id: 0x0c498079, /10.3.1.112:38267 :> /10.3.1.111:11111], exception=java.lang.NullPointerException at org.jboss.netty.channel.socket.nio.NioWorker.cleanUpWriteBuffer(NioWorker.java:627) at org.jboss.netty.channel.socket.nio.NioWorker.close(NioWorker.java:599) at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleAcceptedSocket(NioServerSocketPipelineSink.java:119) at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:76) at org.jboss.netty.channel.Channels.close(Channels.java:720) at org.jboss.netty.channel.AbstractChannel.close(AbstractChannel.java:200) at com.alibaba.otter.canal.server.netty.handler.SessionHandler.exceptionCaught(SessionHandler.java:216) at org.jboss.netty.handler.timeout.IdleStateAwareChannelHandler.handleUpstream(IdleStateAwareChannelHandler.java:48) at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:461) at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:432) at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:52) at org.jboss.netty.channel.Channels.write(Channels.java:611) at org.jboss.netty.channel.Channels.write(Channels.java:578) at com.alibaba.otter.canal.server.netty.NettyUtils.write(NettyUtils.java:28) at com.alibaba.otter.canal.server.netty.handler.SessionHandler.messageReceived(SessionHandler.java:144) at org.jboss.netty.handler.timeout.IdleStateAwareChannelHandler.handleUpstream(IdleStateAwareChannelHandler.java:48) at org.jboss.netty.handler.timeout.IdleStateHandler.messageReceived(IdleStateHandler.java:275) at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:302) at org.jboss.netty.handler.codec.replay.ReplayingDecoder.unfoldAndFireMessageReceived(ReplayingDecoder.java:525) at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:506) at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:443) at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274) at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261) at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:349) at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:280) at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:200) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) 各位大佬，为什么canal server会经常报这个错误，我看client端一直在消费。

原提问者GitHub用户shawn-happy