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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5671) 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)
Date Fri, 27 Dec 2013 18:03:55 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13857599#comment-13857599

stack commented on HDFS-5671:

Patch LGTM caveat the Uma comment (Maybe add the ex.getMessage to the string logged so can
be tied to the exception when it comes out higher up the stack?).

> 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
>            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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