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Date: Sat, 21 Jun 2014 01:10:25 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12713258.1399620218202.22273.1403313025129@arcas>
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Subject: [jira] [Commented] (HADOOP-10591) Compression codecs must used
 pooled direct buffers or deallocate direct buffers when stream is closed
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    [ https://issues.apache.org/jira/browse/HADOOP-10591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039619#comment-14039619 ] 

Hadoop QA commented on HADOOP-10591:
------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12651774/HADOOP-10591.001.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/4132//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/4132//console

This message is automatically generated.

> Compression codecs must used pooled direct buffers or deallocate direct buffers when stream is closed
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-10591
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10591
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Hari Shreedharan
>            Assignee: Colin Patrick McCabe
>         Attachments: HADOOP-10591.001.patch
>
>
> Currently direct buffers allocated by compression codecs like Gzip (which allocates 2 direct buffers per instance) are not deallocated when the stream is closed. Eventually for long running processes which create a huge number of files, these direct buffers are left hanging till a full gc, which may or may not happen in a reasonable amount of time - especially if the process does not use a whole lot of heap.
> Either these buffers should be pooled or they should be deallocated when the stream is closed.


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