hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Robert Joseph Evans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3343) TaskTracker Out of Memory because of distributed cache
Date Mon, 07 Nov 2011 14:34:51 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145525#comment-13145525
] 

Robert Joseph Evans commented on MAPREDUCE-3343:
------------------------------------------------

The patch itself looks good to me, but I would like to see some tests added, or a justification
why no tests are needed.
                
> TaskTracker Out of Memory because of distributed cache
> ------------------------------------------------------
>
>                 Key: MAPREDUCE-3343
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3343
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv1
>    Affects Versions: 0.20.205.0
>            Reporter: Ahmed Radwan
>              Labels: mapreduce, patch
>         Attachments: bug-fix-avoid-memory-leak-in-TrackerDistributedCacheManager.patch
>
>
> This Out of Memory happens when you run large number of jobs (using the distributed cache)
on a TaskTracker. 
> Seems the basic issue is with the distributedCacheManager (instance of TrackerDistributedCacheManager
in TaskTracker.java), this gets created during TaskTracker.initialize(), and it keeps references
to TaskDistributedCacheManager for every submitted job via the jobArchives Map, also references
to CacheStatus via cachedArchives map. I am not seeing these cleaned up between jobs, so this
can out of memory problems after really large number of jobs are submitted. We have seen this
issue in a number of cases.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message