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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11593) Change SimpleHttpProxyHandler#exceptionCaught log level from info to debug
Date Wed, 29 Mar 2017 21:36:41 GMT
Xiaoyu Yao created HDFS-11593:
---------------------------------

             Summary: 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


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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