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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5548) Observed negative running maps on the job tracker
Date Sat, 21 Mar 2009 03:58:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12685413#action_12685413
] 

Devaraj Das commented on HADOOP-5548:
-------------------------------------

The recovery manager processes one job at a time. During the recovery, the updateTaskTrackerStatus
would create dummy TaskTrackerStatus objects with 0 map/reduce slots for the trackers. Also,
the IPC server is not up until the recovery manager returns. I don't think the negative value
for maps in the cluster summary has anything to do with the recovery process. This has been
observed before and reported - HADOOP-5231.

> 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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