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https://issues.apache.org/jira/browse/HDFS-3555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399087#comment-13399087
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Harsh J commented on HDFS-3555:
-------------------------------
I think it can be INFO/WARN, but not ERROR (it isn't that very severe) nor
DEBUG (hard to see if clients are misbehaving in this case). Thoughts Andy?
Should we really make it DEBUG?
Also, can we check and lower a write-side ERROR message if one exists for a
similar case (reading data from client timing out)?
> 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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