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Date: Wed, 15 Jun 2011 00:04:47 +0000 (UTC)
From: "Matt Foley (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Resolved] (HDFS-1836) Thousand of CLOSE_WAIT socket
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     [ https://issues.apache.org/jira/browse/HDFS-1836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matt Foley resolved HDFS-1836.
------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 0.20.205.0)

Committed to 0.20-security for .206 release.
Will correct the "Fix Versions" field when .206 is added.

> Thousand of CLOSE_WAIT socket 
> ------------------------------
>
>                 Key: HDFS-1836
>                 URL: https://issues.apache.org/jira/browse/HDFS-1836
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.20.2
>         Environment: Linux 2.6.18-194.32.1.el5 #1 SMP Wed Jan 5 17:52:25 EST 2011 x86_64 x86_64 x86_64 GNU/Linux
> java version "1.6.0_23"
> Java(TM) SE Runtime Environment (build 1.6.0_23-b05)
> Java HotSpot(TM) 64-Bit Server VM (build 19.0-b09, mixed mode)
>            Reporter: Dennis Cheung
>            Assignee: Bharath Mundlapudi
>             Fix For: 0.20.3
>
>         Attachments: hdfs-1836-0.20.205.txt, hdfs-1836-0.20.txt, hdfs-1836-0.20.txt, patch-draft-1836.patch
>
>
> $ /usr/sbin/lsof -i TCP:50010 | grep -c CLOSE_WAIT
> 4471
> It is better if everything runs normal. 
> However, from time to time there are some "DataStreamer Exception: java.net.SocketTimeoutException" and "DFSClient.processDatanodeError(2507) | Error Recovery for" can be found from log file and the number of CLOSE_WAIT socket just keep increasing
> The CLOSE_WAIT handles may remain for hours and days; then "Too many open file" some day.

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