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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3762) Task tracker died due to OOM
Date Sat, 19 Jul 2008 04:05:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12614942#action_12614942

Hadoop QA commented on HADOOP-3762:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 678080.

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

    +1 tests included.  The patch appears to include 4 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 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/2908/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2908/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2908/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2908/console

This message is automatically generated.

> Task tracker died due to OOM 
> -----------------------------
>                 Key: HADOOP-3762
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3762
>             Project: Hadoop Core
>          Issue Type: Bug
>            Reporter: Runping Qi
>            Assignee: Doug Cutting
>            Priority: Blocker
>             Fix For: 0.18.0
>         Attachments: 3762_20080715.patch, 3762_20080715b.patch, 3762_20080715c.patch,
3762_20080717.patch, HADOOP-3762.patch, HADOOP-3762.patch, HADOOP-3762.patch, HADOOP-3762.patch,
> When running about 100 moderate jobs on a small cluster (with 19 Task Trackers),
> the task trackers all died due to OOM.
> I got a chance to dump the jstack strace of a task tracker before it died.
> Its image size was close 4GB!
> I saw 1200+ threads of DFSClient.LeaseChecker.
> Clearly we have a severe resource leakage problem!

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