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https://issues.apache.org/jira/browse/MAPREDUCE-4366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647208#comment-13647208
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Sandy Ryza commented on MAPREDUCE-4366:
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Verified this on a cluster with a job that triggers speculative execution and
ran TestJobInProgress
> 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: Thomas Graves
>
> 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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