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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3864) JobTracker lockup due to JobInProgress.initTasks taking significant time for large jobs on large clusters
Date Fri, 22 Aug 2008 12:34:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624748#action_12624748
] 

Hudson commented on HADOOP-3864:
--------------------------------

Integrated in Hadoop-trunk #581 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/581/])

> JobTracker lockup due to JobInProgress.initTasks taking significant time for large jobs
on large clusters
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3864
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3864
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.18.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>            Priority: Critical
>             Fix For: 0.19.0
>
>         Attachments: HADOOP-3864_0_20080830.patch
>
>
> JobInProgress.initTasks takes significant amount of time on a large cluster for large
jobs (55k maps * 3 splits), during which the JobInProgress object is locked up.
> Simultaneously the JobClient is calling JobTracker.getTaskCompletionEvents which locks
the JobTracker & tries to lock the JobInProgress, there-by it starves all heartbeats which
are trying to lock the JobTracker - resulting in a lockup.

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