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Date: Sun, 28 Nov 2010 00:23:41 -0500 (EST)
From: "Arun C Murthy (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-2108) Allow TaskScheduler manage
 number slots on TaskTrackers
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-2108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964498#action_12964498 ] 

Arun C Murthy commented on MAPREDUCE-2108:
------------------------------------------

Can you please describe the changes you are making here... 

> Allow TaskScheduler manage number slots on TaskTrackers
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-2108
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2108
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: contrib/capacity-sched, contrib/fair-share
>    Affects Versions: 0.22.0
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-2108.txt
>
>
> Currently the map slots and reduce slots are managed by TaskTracker configuration.
> To change the task tracker slots, we need to restart the TaskTrackers.
> Also, for a non-uniform cluster, we have to deploy different sets of configuration.
> Now JobTracker holds the CPU and memory status of TaskTrackers (MAPREDUCE-1218).
> So it makes sense to just let JobTracker.taskScheduler decided the number of slots on each node.
> This way we can
> 1. Change the number of slots dynamically without restarting TaskTracker
> 2. Use different number of slots based on the resource of a TaskTracker
> To achieve this, we need to change the logic that we use totalMapSlots and totalReduceSlots in JobTracker.
> I think they are used in WebUI and speculativeCap.
> We will need to make JobTracker calculate these numbers from TaskScheduler and TaskTrackerStatus.
> TaskScheduler and TaskTracker can both hold their maximum slots. We pick the smaller one.
> Thoughts?

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