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https://issues.apache.org/jira/browse/HDFS-11593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15991573#comment-15991573
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Xiaobing Zhou commented on HDFS-11593:
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Posted initial patch for review.
> Change SimpleHttpProxyHandler#exceptionCaught log level from info to debug
> --------------------------------------------------------------------------
>
> Key: HDFS-11593
> URL: https://issues.apache.org/jira/browse/HDFS-11593
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: Xiaoyu Yao
> Assignee: Xiaobing Zhou
> Priority: Minor
> Labels: newbie
> Attachments: HDFS-11593.000.patch
>
>
> A busy datanode may have many client disconnect exception logged with stack
> like below, which does not provide much useful information. Propose to reduce
> the log level from info to debug.
> {code}
> 2017-03-29 20:28:55,225 INFO web.DatanodeHttpServer
> (SimpleHttpProxyHandler.java:exceptionCaught(147)) - Proxy for / failed.
> cause:
> java.io.IOException: Connection reset by peer
> at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
> at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
> at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
> at sun.nio.ch.IOUtil.read(IOUtil.java:192)
> at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
> at
> io.netty.buffer.UnpooledUnsafeDirectByteBuf.setBytes(UnpooledUnsafeDirectByteBuf.java:446)
> at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:881)
> at
> io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:225)
> at
> io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:119)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
> at
> io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
> at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
> at
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
> at
> io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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