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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5145) Balancer sometimes runs out of memory after days or weeks running
Date Thu, 05 Mar 2009 09:23:56 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679132#action_12679132

Hadoop QA commented on HADOOP-5145:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 750237.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-minerva.apache.org/8/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-minerva.apache.org/8/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-minerva.apache.org/8/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-minerva.apache.org/8/console

This message is automatically generated.

> Balancer sometimes runs out of memory after days or weeks running
> -----------------------------------------------------------------
>                 Key: HADOOP-5145
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5145
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.21.0
>         Attachments: balancerOME.patch, balancerOME1.patch
> The culprit is a HashMap called MovedBlocks. By design this map does not get cleaned
up between iterations. This is because the deletion of source replicas is done by NN. When
next iteration starts, source replicas may not have been deleted, Balancer does not want to
schedule them to move again. To prevent running out of memory, Balancer should expire/clean
the movedBlocks from some iterations back.

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