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Date: Tue, 15 Oct 2013 02:14:42 +0000 (UTC)
From: "Sandy Ryza (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12673303.1381436392153.63766.1381803282819@arcas>
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References: <JIRA.12673303.1381436392153@arcas>
Subject: [jira] [Commented] (YARN-1290) Let continuous scheduling achieve
 more balanced task assignment
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    [ https://issues.apache.org/jira/browse/YARN-1290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13794788#comment-13794788 ] 

Sandy Ryza commented on YARN-1290:
----------------------------------

I was concerned that the sort would have a performance impact, but ran it through a container assigning microbenchmark with 1000 nodes and didn't see an significant effect.

+1

> Let continuous scheduling achieve more balanced task assignment
> ---------------------------------------------------------------
>
>                 Key: YARN-1290
>                 URL: https://issues.apache.org/jira/browse/YARN-1290
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Wei Yan
>            Assignee: Wei Yan
>         Attachments: main.pdf, YARN-1290.patch, YARN-1290.patch, YARN-1290.patch
>
>
> Currently, in continuous scheduling (YARN-1010), in each round, the thread iterates over pre-ordered nodes and assigns tasks. This mechanism may overload the first several nodes, while the latter nodes have no tasks.
> We should sort all nodes according to available resource. In each round, always assign tasks to nodes with larger capacity, which can balance the load distribution among all nodes.


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