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From "Sharad Agarwal (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1048) Show total slot usage in cluster summary on jobtracker webui
Date Wed, 14 Oct 2009 09:24:31 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765480#action_12765480
] 

Sharad Agarwal commented on MAPREDUCE-1048:
-------------------------------------------

Overall looks fine. Few minor comments:
move methods JobTracker#getReserved{Map/Reduce}Slots to TaskTracker
Add reserve slots to ClusterMetrics
In heartbeat, there may not be increment in the reserved slots if after the decrement the
call gets short circuited. Would be better if we update the reserved slots at more granular
level in processHeartbeat and around assignTasks call.


> 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: Bug
>          Components: jobtracker
>    Affects Versions: 0.20.1
>            Reporter: Amar Kamat
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>
>         Attachments: mapred-1048-v1.0.patch, mapred-1048-v1.1.patch, patch-1048-1.txt,
patch-1048-2.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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