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List:       hadoop-user
Subject:    DataXceiver: java.io.IOException: Connection reset by peer
From:       "Rong-en Fan" <grafan () gmail ! com>
Date:       2008-06-30 11:30:27
Message-ID: 6eb82e0806300430u44f01a6fl12795111013f42d4 () mail ! gmail ! com
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Hi,

I'm using Hadoop 0.17.1 with HBase trunk, and notice lots of exception
in hadoop's log (it's a 3-node hdfs):

2008-06-30 19:27:45,760 ERROR org.apache.hadoop.dfs.DataNode: 192.168.23.1:500
10:DataXceiver: java.io.IOException: Connection reset by peer
        at sun.nio.ch.FileDispatcher.write0(Native Method)
        at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:29)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:104)
        at sun.nio.ch.IOUtil.write(IOUtil.java:75)
        at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:334)
        at org.apache.hadoop.net.SocketOutputStream$Writer.performIO(SocketOutputStream.java:53)
        at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:140)
        at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:144)
        at org.apache.hadoop.net.SocketOutputStream.write(SocketOutputStream.java:105)
        at java.io.BufferedOutputStream.write(BufferedOutputStream.java:105)
        at java.io.DataOutputStream.write(DataOutputStream.java:90)
        at org.apache.hadoop.dfs.DataNode$BlockSender.sendChunks(DataNode.java:1774)
        at org.apache.hadoop.dfs.DataNode$BlockSender.sendBlock(DataNode.java:1813)
        at org.apache.hadoop.dfs.DataNode$DataXceiver.readBlock(DataNode.java:1039)
        at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:968)
        at java.lang.Thread.run(Thread.java:619)

It seems to me that the datanode can not handle the incoming traffic.
If so, what parameters in hadoop sire and/or in os (I'm using rhel 4) that
I can play with?

Thanks,
Rong-En Fan
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