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https://issues.apache.org/jira/browse/HADOOP-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635288#action_12635288
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Sreekanth Ramakrishnan commented on HADOOP-4287:
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I think it would be simpler to deduce the number of pending task by subtracting
values from _desiredMaps()_ and _finishedMaps()_. Similarly for reduces, I am
making an assumption that value of the _finishedMapTasks_ and
_finishedReduceTasks_ are bumped up by one whenever a speculative task has
finished. This way, we don't need to keep track of the number of failed maps or
reduces, since our scheduling algorithm does not assign weight to number of
failures.
> [mapred] jobqueue_details.jsp shows negative count of running and waiting
> reduces with CapacityTaskScheduler.
> -------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-4287
> URL: https://issues.apache.org/jira/browse/HADOOP-4287
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/capacity-sched
> Reporter: Vinod K V
>
> This I observed while running a job that always fails because of reduce
> failures. Need to investigate this.
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