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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-13039) StripedBlockReader#createBlockReader leaks socket on IOException
Date Fri, 19 Jan 2018 18:53:00 GMT
Lei (Eddy) Xu created HDFS-13039:
------------------------------------

             Summary: StripedBlockReader#createBlockReader leaks socket on IOException
                 Key: HDFS-13039
                 URL: https://issues.apache.org/jira/browse/HDFS-13039
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode, erasure-coding
    Affects Versions: 3.0.0
            Reporter: Lei (Eddy) Xu
            Assignee: Lei (Eddy) Xu


When running EC on one cluster, DataNode has millions of {{CLOSE_WAIT}} connections
{code:java}
$ 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
{code}

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



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