Lei (Eddy) Xu created HDFS-13039:
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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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