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https://issues.apache.org/jira/browse/HDFS-5671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13857559#comment-13857559
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Uma Maheswara Rao G commented on HDFS-5671:
-------------------------------------------
{code}
DFSClient.LOG.info("Close connection,rethrow exception");
{code}
Please change the log message like ( "Exception while getting block reader,
closing stale " + peer , exception ) and change the priority to debug level
> When client request block to DataNode and "java.io.IOException" occurs, the
> fail TCP socket is not closed (in status "CLOSE_WAIT" with port 1004 of
> DataNode)
> --------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-5671
> URL: https://issues.apache.org/jira/browse/HDFS-5671
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.2.0
> Environment: hadoop-2.2.0
> java version "1.6.0_31"
> Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
> Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)
> Linux 2.6.32-358.14.1.el6.x86_64 #1 SMP Tue Jul 16 23:51:20 UTC 2013 x86_64
> x86_64 x86_64 GNU/Linux
> Reporter: JamesLi
> Priority: Critical
> Attachments: 5671.patch, 5671v1.patch
>
>
> lsof -i TCP:1004 | grep -c CLOSE_WAIT
> 18235
> When client request a file's block to DataNode:1004. If request fail because
> "java.io.IOException: Got error for OP_READ_BLOCK,Block token is expired."
> Occurs and the TCP socket that regionserver using is not closed.
> I think the problem above is in DatanodeInfo blockSeekTo(long target) of
> Class DFSInputStream
> The connection client using is BlockReader:
> blockReader = getBlockReader(targetAddr, chosenNode, src, blk,
> accessToken, offsetIntoBlock, blk.getNumBytes() - offsetIntoBlock,
> buffersize, verifyChecksum, dfsClient.clientName);
> In DFSInputStream.blockSeekTo()-line 533,invoke getBlockReader() which wil
> generate a peer use newTcpPeer(dnAddr) -line 1107,when
> BlockReaderFactory.newBlockReader throw IOException,the peer will not be
> closed which will cause a CLOSE_WAIT connection.
> In our test,when datanode get a InvalidToken exception in
> DataXceiver.checkAccess(),it will close the connection.At regionserver side,
> in RemoteBlockReader2.newBlockReader(),checkSuccess() will throw a
> InvalidBlockTokenException, DFSInputStream.blockSeekTo() will catch the
> exception, but the connection is NOT closed, it become CLOSE_WAIT.
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