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  1. Hadoop HDFS
  2. HDFS-13039

StripedBlockReader#createBlockReader leaks socket on IOException

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Details

    • Bug
    • Status: Resolved
    • Critical
    • Resolution: Fixed
    • 3.0.0
    • 3.1.0, 3.0.1
    • datanode, erasure-coding
    • None

    Description

      When running EC on one cluster, DataNode has millions of CLOSE_WAIT connections

      $ grep CLOSE_WAIT lsof.out | wc -l
      10358700
      
      // All CLOSW_WAITs belong to the same DataNode process (pid=88527)
      $ grep CLOSE_WAIT lsof.out | awk '{print $2}' | sort | uniq
      88527
      

      And DN can not open any file / socket, as shown in the log:

      2018-01-19 06:47:09,424 WARN io.netty.channel.DefaultChannelPipeline: An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
      java.io.IOException: Too many open files
              at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
              at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
              at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
              at io.netty.channel.socket.nio.NioServerSocketChannel.doReadMessages(NioServerSocketChannel.java:135)
              at io.netty.channel.nio.AbstractNioMessageChannel$NioMessageUnsafe.read(AbstractNioMessageChannel.java:75)
              at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:563)
              at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:504)
              at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:418)
              at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:390)
              at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:742)
              at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:145)
              at java.lang.Thread.run(Thread.java:748)
      

      Attachments

        1. HDFS-13039.00.patch
          2 kB
          Lei (Eddy) Xu
        2. HDFS-13039.01.patch
          1 kB
          Lei (Eddy) Xu

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            eddyxu Lei (Eddy) Xu
            eddyxu Lei (Eddy) Xu
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              Created:
              Updated:
              Resolved:

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