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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-45) Scheduler feedback to AM to release containers
Date Wed, 10 Apr 2013 21:07:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13628247#comment-13628247

Alejandro Abdelnur commented on YARN-45:

Nice, the proposed functionality comes quite handy for some stuff I'm working on.

Regarding the question on how to model the PreemptRequest, have you thought about the following

* The PreemptRequest would contain only a Set<PreemptResource>.
* PreemptResource has the following properties: a String location, a Resource capability
* The PreemptResource location can be ANY, a rack or a node.
* The PreemptResource capability is the total capacity that should be released.
* The AM, if taking the hint, would release containers that match the location and add up
to the PreemptResource capability.

By doing this, you give full control to the AM to decide what to release by grouping any containers
that match the location.


> Scheduler feedback to AM to release containers
> ----------------------------------------------
>                 Key: YARN-45
>                 URL: https://issues.apache.org/jira/browse/YARN-45
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          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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