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https://issues.apache.org/jira/browse/HDFS-5671?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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JamesLi updated HDFS-5671:
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Attachment: 5671v1.patch
5671.patch is not correct,this patch fix the CLOSE_WAIT bug,in our test,after
patch,CLOSE_WAIT do not increase.
> When Hbase RegionServer 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 hbase regionserver 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 regionserver using is BlockReader:
> blockReader = getBlockReader(targetAddr, chosenNode, src, blk,
> accessToken, offsetIntoBlock, blk.getNumBytes() - offsetIntoBlock,
> buffersize, verifyChecksum, dfsClient.clientName);
> and if this connection fail, regionserver will fetch a new access token , and
> old Connection is not closed here.
> I think need small code to close old Connection when exception happens:
> if(blockReader != null)
> try{
> blockReader.close();
> blockReader = null;
> } catch (IOException exc) {
> DFSClient.LOG.error("Close connection to " + targetAddr
> + " failed");
> }
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