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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3762) Task tracker died due to OOM
Date Tue, 15 Jul 2008 21:29:31 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Runping Qi updated HADOOP-3762:
-------------------------------

    Attachment: TaskTrackerStackTrace.txt

jstack dump attached.


> 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
>            Priority: Blocker
>         Attachments: TaskTrackerStackTrace.txt
>
>
> 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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