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From "Sreekanth Ramakrishnan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4513) Capacity scheduler should initialize tasks asynchronously
Date Fri, 14 Nov 2008 11:28:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12647588#action_12647588
] 

Sreekanth Ramakrishnan commented on HADOOP-4513:
------------------------------------------------

Attaching output of ant test-patch

{noformat}
     [exec] +1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 3 new or modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec] 
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec] 
     [exec]     +1 Eclipse classpath. The patch retains Eclipse classpath integrity.
{noformat}

> Capacity scheduler should initialize tasks asynchronously
> ---------------------------------------------------------
>
>                 Key: HADOOP-4513
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4513
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/capacity-sched
>    Affects Versions: 0.19.0
>            Reporter: Hemanth Yamijala
>            Assignee: Sreekanth Ramakrishnan
>             Fix For: 0.19.1
>
>         Attachments: HADOOP-4513-1.patch
>
>
> Currently, the capacity scheduler initializes tasks on demand, as opposed to the eager
initialization technique used by the default scheduler. This is done in order to save JT memory
footprint. However, the initialization is done in the {{assignTasks}} API which is not a good
idea as task initialization could be a time consuming operation. This JIRA is to move out
the initialization outside the {{assignTasks}} API and do it asynchronously.

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