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Date: Mon, 24 Oct 2011 18:18:32 +0000 (UTC)
From: "Tsz Wo (Nicholas), SZE (Updated) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-2494) [webhdfs] When Getting the file using
 OP=OPEN with DN http address, ESTABLISHED sockets are growing.
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     [ https://issues.apache.org/jira/browse/HDFS-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE updated HDFS-2494:
-----------------------------------------

    Attachment: h2494_20111024.patch

Hi Uma, thanks for catching the bug.  The input stream is not closed in the case {{n == null}}.  The two {{IOUtils.copyBytes(..}}}s behave differently: the second one closes in but the first does not.
 
h2494_20111024.patch: close in.

Could you test the patch?
                
> [webhdfs] When Getting the file using OP=OPEN with DN http address, ESTABLISHED sockets are growing.
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-2494
>                 URL: https://issues.apache.org/jira/browse/HDFS-2494
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.24.0
>            Reporter: Uma Maheswara Rao G
>            Assignee: Uma Maheswara Rao G
>         Attachments: h2494_20111024.patch
>
>
> As part of the reliable test,
> Scenario:
> Initially check the socket count. ---there are aroud 42 sockets are there.
> open the file with DataNode http address using op=OPEN request parameter about 500 times in loop.
> Wait for some time and check the socket count. --- There are thousands of ESTABLISHED sockets are growing. ~2052
> Here is the netstat result:
> C:\Users\uma>netstat | grep 127.0.0.1 | grep ESTABLISHED |wc -l
> 2042
> C:\Users\uma>netstat | grep 127.0.0.1 | grep ESTABLISHED |wc -l
> 2042
> C:\Users\uma>netstat | grep 127.0.0.1 | grep ESTABLISHED |wc -l
> 2042
> C:\Users\uma>netstat | grep 127.0.0.1 | grep ESTABLISHED |wc -l
> 2042
> C:\Users\uma>netstat | grep 127.0.0.1 | grep ESTABLISHED |wc -l
> 2042
> C:\Users\uma>netstat | grep 127.0.0.1 | grep ESTABLISHED |wc -l
> 2042
> C:\Users\uma>netstat | grep 127.0.0.1 | grep ESTABLISHED |wc -l
> 2042
> C:\Users\uma>netstat | grep 127.0.0.1 | grep ESTABLISHED |wc -l
> 2042
> C:\Users\uma>netstat | grep 127.0.0.1 | grep ESTABLISHED |wc -l
> 2042
> This count is not coming down.

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