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https://issues.apache.org/jira/browse/MAPREDUCE-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768154#action_12768154
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Hemanth Yamijala commented on MAPREDUCE-1048:
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There are two possible numbers that we can show for the occupied slots. It
could be the number of slots running tasks, or it could be the number of slots
running tasks + the number of virtual reserved slots (virtual reserved slots
for a job = number of trackers with reservations for the job * number of slots
per task for the job). Showing the actual number of slots running tasks gives a
more correct view, but the second number would be what is seen by the scheduler
as the capacity consumed. I think it may be good to show the first number only
- it is more intuitive and more correct. Thoughts ?
> Show total slot usage in cluster summary on jobtracker webui
> ------------------------------------------------------------
>
> Key: MAPREDUCE-1048
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1048
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Affects Versions: 0.20.1
> Reporter: Amar Kamat
> Assignee: Amareshwari Sriramadasu
> Fix For: 0.22.0
>
> Attachments: mapred-1048-v1.0.patch, mapred-1048-v1.1.patch,
> patch-1048-0.20.txt, patch-1048-1.txt, patch-1048-2.txt, patch-1048-3.txt,
> patch-1048-4.txt, patch-1048-5.txt, patch-1048-6.txt, patch-1048-ydist.txt,
> patch-1048.txt
>
>
> With High-Ram jobs coming into the picture, its important to also show the
> slot usage in cluster summary since total-running-maps <
> total-slots-occupied.
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