[jira] Commented: (MAPREDUCE-1048) Show total slot usage in cluster summary on jobtracker webui

["Amar Kamat (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762566#action_12762566 ] 

Amar Kamat commented on MAPREDUCE-1048:
---------------------------------------

One disconnect here is that the slots info is computed using the jobinprogress while cluster-summary is computed via task-tracker join-backs. Hence the is a small window where the data will be inconsistent. So another proposal is 
- Show slots info along with running jobs and show the total count in the end.
- Show the slots info in a separate section.
- Keep slots info in cluster summary but not to be shared with clients (i.e dont serialize it)
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
>            Reporter: Amar Kamat
>            Assignee: Amar Kamat
>         Attachments: mapred-1048-v1.0.patch, mapred-1048-v1.1.patch
>
>
> 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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