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https://issues.apache.org/jira/browse/MAPREDUCE-1103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769093#action_12769093
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Jothi Padmanabhan commented on MAPREDUCE-1103:
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+1. Patch looks good

> Additional JobTracker metrics
> -----------------------------
>
>                 Key: MAPREDUCE-1103
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1103
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: jobtracker
>    Affects Versions: 0.21.0
>            Reporter: Arun C Murthy
>            Assignee: Sharad Agarwal
>             Fix For: 0.22.0
>
>         Attachments: 1103.patch, 1103.patch, 1103_v1.patch, 1103_v2.patch, 
> 1103_v3.patch, 1103_v4.patch, 1103_v5.patch
>
>
> It would be useful for tracking the following additional JobTracker metrics:
> running{map|reduce}tasks
> busy{map|reduce}slots
> reserved{map|reduce}slots

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