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https://issues.apache.org/jira/browse/MAPREDUCE-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706440#comment-13706440
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Sandy Ryza commented on MAPREDUCE-4366:
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[~acmurthy], any further thoughts on this? From going through the code, the
only place this is used is in the Capacity Scheduler. My reading of that code
is that this change will not be harmful and that the code essentially expected
things to work this way in the first place. In some rare situations it will
allow tasks to be assigned earlier than they previously had been able to, and
this will be correct.
> mapred metrics shows negative count of waiting maps and reduces
> ---------------------------------------------------------------
>
> Key: MAPREDUCE-4366
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4366
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 1.0.2
> Reporter: Thomas Graves
> Assignee: Sandy Ryza
> Attachments: MAPREDUCE-4366-branch-1-1.patch,
> MAPREDUCE-4366-branch-1.patch
>
>
> Negative waiting_maps and waiting_reduces count is observed in the mapred
> metrics. MAPREDUCE-1238 partially fixed this but it appears there is still
> issues as we are seeing it, but not as bad.
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