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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2108) Allow TaskScheduler manage number slots on TaskTrackers
Date Sun, 27 Feb 2011 16:53:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999995#comment-12999995

Hadoop QA commented on MAPREDUCE-2108:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 1074251.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    -1 contrib tests.  The patch failed contrib unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/63//testReport/
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/63//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/63//console

This message is automatically generated.

> 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: 0.23.0
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>             Fix For: 0.23.0
>         Attachments: MAPREDUCE-2108-v2.txt, 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
> Thoughts?

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