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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-45) Scheduler feedback to AM to release containers
Date Fri, 12 Apr 2013 00:31:15 GMT

    [ https://issues.apache.org/jira/browse/YARN-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629635#comment-13629635
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Karthik Kambatla commented on YARN-45:
--------------------------------------

Great discussion, glad to see this coming along well. Carlo's latest comment makes sense to
me.

Let me know if I understand it right: ResourceRequest part of the message can capture locality,
the AM will try to give back Resources on each node as per this locality information?
                
> Scheduler feedback to AM to release containers
> ----------------------------------------------
>
>                 Key: YARN-45
>                 URL: https://issues.apache.org/jira/browse/YARN-45
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Chris Douglas
>            Assignee: Carlo Curino
>         Attachments: YARN-45.patch
>
>
> The ResourceManager strikes a balance between cluster utilization and strict enforcement
of resource invariants in the cluster. Individual allocations of containers must be reclaimed-
or reserved- to restore the global invariants when cluster load shifts. In some cases, the
ApplicationMaster can respond to fluctuations in resource availability without losing the
work already completed by that task (MAPREDUCE-4584). Supplying it with this information would
be helpful for overall cluster utilization [1]. To this end, we want to establish a protocol
for the RM to ask the AM to release containers.
> [1] http://research.yahoo.com/files/yl-2012-003.pdf

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