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From "Binglin Chang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2364) Shouldn't hold lock on rjob while localizing resources.
Date Sun, 29 May 2011 07:20:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040755#comment-13040755
] 

Binglin Chang commented on MAPREDUCE-2364:
------------------------------------------

We encounter the same problem, when TaskTracker download & unJar a very big job.jar in
localizeJob(), it stops sending heartbeat and web service hangs too. 
Our solution for this issue is to add a new lock in RunningJob class called localizing. Instead
of holding the whole rjob lock, rjob.localizing is locked.

> Shouldn't hold lock on rjob while localizing resources.
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-2364
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2364
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.203.0
>            Reporter: Owen O'Malley
>            Assignee: Devaraj Das
>             Fix For: 0.20.203.0
>
>
> There is a deadlock while localizing resources on the TaskTracker.

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