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  1. Hadoop Map/Reduce
  2. MAPREDUCE-7156

NullPointerException when reaching max shuffle connections

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    • Hadoop Flags:
      Reviewed

      Description

      When you hit the max number of shuffle connections, you can get a lot of NullPointerExceptions from Netty:

      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:
      
      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)
      

      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().

        Attachments

        1. MAPREDUCE-7156-001.patch
          1 kB
          Peter Bacsko
        2. MAPREDUCE-7156-002.patch
          1 kB
          Peter Bacsko

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            • Assignee:
              pbacsko Peter Bacsko
              Reporter:
              pbacsko Peter Bacsko
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              • Created:
                Updated:
                Resolved: