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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5548) Observed negative running maps on the job tracker
Date Fri, 20 Mar 2009 20:30:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12684016#action_12684016
] 

Owen O'Malley commented on HADOOP-5548:
---------------------------------------

My current guess is that the JobTracker went through recovery with running jobs. When looking
at the callers to JobTracker.updateTaskTrackerStatus, which assums that the JobTracker is
locked by the caller, the call tree from RecoverManager.recover doesn't ever lock the job
tracker.

> Observed negative running maps on the job tracker
> -------------------------------------------------
>
>                 Key: HADOOP-5548
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5548
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>            Reporter: Owen O'Malley
>
> We saw in both the web/ui and cli tools:
> {noformat}
> Cluster Summary (Heap Size is 11.7 GB/13.37 GB)
> Maps  Reduces Total       Nodes  Map Task  Reduce Task  Avg.     Blacklisted 
>               Submissions        Capacity   Capacity   Tasks/Node Nodes
> -971  0       133         434     1736        1736      8.00        0
> {noformat}

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