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Date: Fri, 13 Mar 2009 17:30:50 -0700 (PDT)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5285) JobTracker hangs for long periods
 of time
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    [ https://issues.apache.org/jira/browse/HADOOP-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681956#action_12681956 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-5285:
------------------------------------------------

The CleanupQueue.PathCleanupThread causes some problems in TestMiniMRWithDFS.  See HADOOP-5483.

> JobTracker hangs for long periods of time
> -----------------------------------------
>
>                 Key: HADOOP-5285
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5285
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.19.1
>            Reporter: Vinod K V
>            Assignee: Devaraj Das
>            Priority: Blocker
>             Fix For: 0.19.2, 0.20.0, 0.21.0
>
>         Attachments: 5285.1.patch, 5285.patch, trace.txt
>
>
> On one of the larger clusters of 2000 nodes, JT hanged quite often, sometimes for times in the order of 10-15 minutes and once for one and a half hours(!). The stack trace shows that JobInProgress.obtainTaskCleanupTask() is waiting for lock on JobInProgress object which JobInProgress.initTasks() is holding for a long time waiting for DFS operations.

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