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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3381) INode interlinks can multiply effect of memory leaks
Date Sat, 17 May 2008 02:39:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12597690#action_12597690
] 

Hadoop QA commented on HADOOP-3381:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12382217/HADOOP-3381.patch
  against trunk revision 656939.

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

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

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

    +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/2494/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2494/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2494/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2494/console

This message is automatically generated.

> INode interlinks can multiply effect of memory leaks
> ----------------------------------------------------
>
>                 Key: HADOOP-3381
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3381
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>             Fix For: 0.18.0
>
>         Attachments: HADOOP-3381.patch, HADOOP-3381.patch
>
>
> Say a directory 'DIR' has a directory tree under it with 10000 files and directories.
Each INode keeps refs to parent and children. When DIR is deleted, memory wise we essentially
delete link from its parent (and delete the all the blocks from {{blocksMap}}). We don't modify
its children. This is ok since this will form an island of references and will be gc-ed. Thats
when everything is perfect. But if there is a bug that leaves a ref from a valid object (there
is a suspect, I will another jira) to even one of these 10000 files, it could hold up all
the INode and related objects. This can make a smaller mem leak many times more severe.

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