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https://issues.apache.org/jira/browse/HDFS-13039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16334531#comment-16334531
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Jason Lowe commented on HDFS-13039:
-----------------------------------
Note that branch-3 should not be a target of commits per the discussion in
common-dev. It was created by mistake and has since been deleted.
> 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
> Priority: Critical
> Fix For: 3.1.0, 3.0.1
>
> Attachments: HDFS-13039.00.patch, HDFS-13039.01.patch
>
>
> 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 $2}' | sort | uniq
> 88527
> {code}
> And DN can not open any file / socket, as shown in the log:
> {noformat}
> 2018-01-19 06:47:09,424 WARN io.netty.channel.DefaultChannelPipeline: An
> exceptionCaught() event was fired, and it reached at the tail of the
> pipeline. It usually means the last handler in the pipeline did not handle
> the exception.
> java.io.IOException: Too many open files
> at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
> at
> sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
> at
> sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
> at
> io.netty.channel.socket.nio.NioServerSocketChannel.doReadMessages(NioServerSocketChannel.java:135)
> at
> io.netty.channel.nio.AbstractNioMessageChannel$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)
> {noformat}
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