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