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https://issues.apache.org/jira/browse/HADOOP-5548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12688096#action_12688096
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Owen O'Malley commented on HADOOP-5548:
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It should still lock the JobTracker, since it violates the assumption of the
method and could easily be broken during later maintenance.
We still need an explanation of what is going on.
> 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
> Priority: Blocker
>
> 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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