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https://issues.apache.org/jira/browse/MAPREDUCE-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660476#comment-13660476
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Arun C Murthy commented on MAPREDUCE-4366:
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{quote}
No, speculativeMaps == 1, by which we get pendingMaps as 1 since initialMaps=2
+ speculativeMaps=1 - runningMaps=1 - finishedMaps=1 - failedMaps=0. Correct?
{quote}
To be clear - the reason is that the case you outlined speculativeMaps and
runningMaps should track each other correctly. I believe that is the case... I
hate myself for remembering this code! *smile*
> 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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