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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1368) Common work to re-populate containers’ state into scheduler
Date Thu, 01 May 2014 23:42:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13987182#comment-13987182
] 

Sandy Ryza commented on YARN-1368:
----------------------------------

+1 to sharing common code between schedulers where possible.  However, the patch proposed
on this JIRA leaves two separate accountings for the nodes in the cluster - one inside AbstractYarnScheduler
and one inside the specific schedulers.  As [~leftnoteasy] pointed out, if we want to merge
scheduler code, it's probably best to do so in a patch that's separate from adding the re-population
logic.

A meta-comment - [~jianhe], if you have concerns about an approach / prototype it's better
to provide feedback than to rewrite it yourself.

> Common work to re-populate containers’ state into scheduler
> -----------------------------------------------------------
>
>                 Key: YARN-1368
>                 URL: https://issues.apache.org/jira/browse/YARN-1368
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Bikas Saha
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-1368.preliminary.patch
>
>
> YARN-1367 adds support for the NM to tell the RM about all currently running containers
upon registration. The RM needs to send this information to the schedulers along with the
NODE_ADDED_EVENT so that the schedulers can recover the current allocation state of the cluster.



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