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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3581) Prevent memory intensive user tasks from taking down nodes
Date Mon, 08 Sep 2008 20:25:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629277#action_12629277
] 

Hadoop QA commented on HADOOP-3581:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12389676/HADOOP-3581.20080908.txt
  against trunk revision 693048.

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

    +1 tests included.  The patch appears to include 6 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 appears to introduce 1 new Findbugs warnings.

    -1 core tests.  The patch failed core unit tests.

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

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3209/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3209/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3209/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3209/console

This message is automatically generated.

> Prevent memory intensive user tasks from taking down nodes
> ----------------------------------------------------------
>
>                 Key: HADOOP-3581
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3581
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Hemanth Yamijala
>            Assignee: Vinod K V
>         Attachments: HADOOP-3581-final.txt, HADOOP-3581.20080901.2.txt, HADOOP-3581.20080902.txt,
HADOOP-3581.20080904.txt, HADOOP-3581.20080905.txt, HADOOP-3581.20080908.txt, HADOOP-3581.6.0.txt,
patch_3581_0.1.txt, patch_3581_3.3.txt, patch_3581_4.3.txt, patch_3581_4.4.txt, patch_3581_5.0.txt,
patch_3581_5.2.txt
>
>
> Sometimes user Map/Reduce applications can get extremely memory intensive, maybe due
to some inadvertent bugs in the user code, or the amount of data processed. When this happens,
the user tasks start to interfere with the proper execution of other processes on the node,
including other Hadoop daemons like the DataNode and TaskTracker. Thus, the node would become
unusable for any Hadoop tasks. There should be a way to prevent such tasks from bringing down
the node.

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