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https://issues.apache.org/jira/browse/HDFS-3555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Isaacson updated HDFS-3555:
--------------------------------

    Attachment: hdfs-3555.patch

Here's a proposed fix to downgrade the timeout exception from LOG.error to 
LOG.debug. Compiles, but haven't tested yet as my test cluster is busy.
                
> idle client socket triggers DN ERROR log (should be INFO or DEBUG)
> ------------------------------------------------------------------
>
>                 Key: HDFS-3555
>                 URL: https://issues.apache.org/jira/browse/HDFS-3555
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.20.2
>         Environment: Red Hat Enterprise Linux Server release 6.2 (Santiago)
>            Reporter: Jeff Lord
>            Assignee: Andy Isaacson
>         Attachments: hdfs-3555.patch
>
>
> Datanode service is logging java.net.SocketTimeoutException at ERROR level.
> This message indicates that the datanode is not able to send data to the 
> client because the client has stopped reading. This message is not really a 
> cause for alarm and should be INFO level.
> 2012-06-18 17:47:13 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode 
> DatanodeRegistration(x.x.x.x:50010, 
> storageID=DS-196671195-10.10.120.67-50010-1334328338972, infoPort=50075, 
> ipcPort=50020):DataXceiver
> java.net.SocketTimeoutException: 480000 millis timeout while waiting for 
> channel to be ready for write. ch : java.nio.channels.SocketChannel[connected 
> local=/10.10.120.67:50010 remote=/10.10.120.67:59282]
> at 
> org.apache.hadoop.net.SocketIOWithTimeout.waitForIO(SocketIOWithTimeout.java:246)
> at 
> org.apache.hadoop.net.SocketOutputStream.waitForWritable(SocketOutputStream.java:159)
> at 
> org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:198)
> at 
> org.apache.hadoop.hdfs.server.datanode.BlockSender.sendChunks(BlockSender.java:397)
> at 
> org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:493)
> at 
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:267)
> at 
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:163)

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