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https://issues.apache.org/jira/browse/MAPREDUCE-7156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16675154#comment-16675154
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Peter Bacsko commented on MAPREDUCE-7156:
-----------------------------------------
[~jlowe] could you review this change please?
> NullPointerException when reaching max shuffle connections
> ----------------------------------------------------------
>
> Key: MAPREDUCE-7156
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7156
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 2.9.1, 3.1.1
> Reporter: Peter Bacsko
> Assignee: Peter Bacsko
> Priority: Major
> Attachments: MAPREDUCE-7156-001.patch
>
>
> When you hit the max number of shuffle connections, you can get a lot of
> NullPointerExceptions from Netty:
> {noformat}
> 2018-07-17 10:47:36,311 INFO org.apache.hadoop.mapred.ShuffleHandler: Current
> number of shuffle connections (360) is greater than or equal to the max
> allowed shuffle connections (360)
> 2018-07-17 10:47:36,311 INFO org.apache.hadoop.mapred.ShuffleHandler: Current
> number of shuffle connections (360) is greater than or equal to the max
> allowed shuffle connections (360)
> 2018-07-17 10:47:36,312 INFO org.apache.hadoop.mapred.ShuffleHandler: Current
> number of shuffle connections (360) is greater than or equal to the max
> allowed shuffle connections (360)
> 2018-07-17 10:47:36,316 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error:
> java.lang.NullPointerException
> 2018-07-17 10:47:36,317 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error [id: 0x71187405, /10.17.226.11:44330 => /10.17.202.21:13562]
> EXCEPTION: java.lang.NullPointerException
> 2018-07-17 10:47:36,317 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error:
> java.lang.NullPointerException
> 2018-07-17 10:47:36,317 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error [id: 0x71187405, /10.17.226.11:44330 => /10.17.202.21:13562]
> EXCEPTION: java.lang.NullPointerException
> 2018-07-17 10:47:36,317 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error:
> java.lang.NullPointerException
> 2018-07-17 10:47:36,317 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error [id: 0x71187405, /10.17.226.11:44330 => /10.17.202.21:13562]
> EXCEPTION: java.lang.NullPointerException
> 2018-07-17 10:47:36,329 INFO
> org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor.ContainersMonitorImpl:
> Skipping monitoring container container_e22_1531424278071_55040_01_002295
> since CPU usage is not yet available.
> 2018-07-17 10:47:36,340 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error:
> java.lang.NullPointerException
> 2018-07-17 10:47:36,340 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error [id: 0xea8afd26, /10.17.202.18:43810 => /10.17.202.21:13562]
> EXCEPTION: java.lang.NullPointerException
> 2018-07-17 10:47:36,349 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error:
> java.lang.NullPointerException
> 2018-07-17 10:47:36,349 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error [id: 0xea8afd26, /10.17.202.18:43810 => /10.17.202.21:13562]
> EXCEPTION: java.lang.NullPointerException
> 2018-07-17 10:47:36,349 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error:
> java.lang.NullPointerException
> 2018-07-17 10:47:36,349 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error [id: 0xea8afd26, /10.17.202.18:43810 => /10.17.202.21:13562]
> EXCEPTION: java.lang.NullPointerException
> 2018-07-17 10:47:36,361 INFO org.apache.hadoop.mapred.ShuffleHandler: Current
> number of shuffle connections (360) is greater than or equal to the max
> allowed shuffle connections (360)
> 2018-07-17 10:47:36,390 INFO org.apache.hadoop.mapred.ShuffleHandler: Current
> number of shuffle connections (360) is greater than or equal to the max
> allowed shuffle connections (360)
> 2018-07-17 10:47:36,395 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error:
> {noformat}
> {noformat}
> 2018-07-17 13:58:28,263 INFO org.apache.hadoop.mapred.ShuffleHandler: Current
> number of shuffle connections (360) is greater than or equal to the max
> allowed shuffle connections (360)
> 2018-07-17 13:58:28,264 ERROR org.apache.hadoop.mapred.ShuffleHandler:
> Shuffle error:
> java.lang.NullPointerException
> at
> org.jboss.netty.handler.timeout.IdleStateHandler.writeComplete(IdleStateHandler.java:302)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:73)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
> at
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.writeComplete(SimpleChannelUpstreamHandler.java:233)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:73)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
> at
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
> at
> org.jboss.netty.handler.stream.ChunkedWriteHandler.handleUpstream(ChunkedWriteHandler.java:142)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
> at
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.writeComplete(SimpleChannelUpstreamHandler.java:233)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:73)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
> at
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.writeComplete(SimpleChannelUpstreamHandler.java:233)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:73)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
> at
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.writeComplete(SimpleChannelUpstreamHandler.java:233)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:73)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
> at
> org.jboss.netty.channel.Channels.fireWriteComplete(Channels.java:324)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.write0(AbstractNioWorker.java:299)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.writeFromUserCode(AbstractNioWorker.java:146)
> at
> org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleAcceptedSocket(NioServerSocketPipelineSink.java:99)
> at
> org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:36)
> at
> org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendDownstream(DefaultChannelPipeline.java:779)
> at org.jboss.netty.channel.Channels.write(Channels.java:725)
> at org.jboss.netty.channel.Channels.write(Channels.java:686)
> at
> org.jboss.netty.handler.ssl.SslHandler.wrapNonAppData(SslHandler.java:1110)
> at org.jboss.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1252)
> at org.jboss.netty.handler.ssl.SslHandler.decode(SslHandler.java:852)
> at
> org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:425)
> at
> org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)
> at
> org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
> at
> org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
> at
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
> at
> org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
> at
> org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)
> at
> org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
> at
> org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
> at
> org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
> at
> org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {noformat}
> Solutions seems to be an one-liner: you have to call {{super.channelOpen(ctx,
> evt);}} in {{Shuffle.channelOpen()}} in both cases. If we don't do this, then
> {{IdleStateHandler}} will not be initialized properly and will get a null
> attachment object when executing {{writeComplete()}}.
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