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https://issues.apache.org/jira/browse/HADOOP-4287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12634803#action_12634803
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Sreekanth Ramakrishnan commented on HADOOP-4287:
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_CapacityTaskScheduler_ uses _JobInProgress.getPendingMaps()_ and
_JobInProgress.getPendingReduces()_. The way the pending maps and reduces are
calculated in JIP can return negative values.
i.e. in case of an always failing task:
Number of task - number of running task - number of failed task - finished
task + speculative task.
When number of failures become large the method returns negative value. But not
sure if this is expected.
> [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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