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https://issues.apache.org/jira/browse/MAPREDUCE-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230635#comment-13230635
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Koji Noguchi commented on MAPREDUCE-1238:
-----------------------------------------

bq. Is this a duplicate of MAPREDUCE-1233?

Arun, not sure. I think MAPREDUCE-1233 is already in the version we run and we 
are still seeing negative metrics for waiting maps/reduces.
                
> mapred metrics shows negative count of waiting maps and reduces 
> ----------------------------------------------------------------
>
>                 Key: MAPREDUCE-1238
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1238
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>            Reporter: Ramya Sunil
>
> Negative waiting_maps and waiting_reduces count is observed in the mapred 
> metrics

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