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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6443) Allow for Priority order relaxing in favor of improved node/rack locality
Date Fri, 07 Apr 2017 13:02:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-6443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15960755#comment-15960755
] 

Jason Lowe commented on YARN-6443:
----------------------------------

Ah, so this apparently is describing a problem that only can occur if scheduler keys are being
used?  I'm not sure we need a flag here.  Seems like we simply should not guarantee that allocations
are returned within a priority group in the order they are requested -- they can be returned
in any order.  It certainly worked that way without scheduler keys.  If you need ordering,
that's what priorities are for.  In that sense I see this not as an enhancement but rather
a bugfix.  Or am I misunderstanding the problem?

> Allow for Priority order relaxing in favor of improved node/rack locality 
> --------------------------------------------------------------------------
>
>                 Key: YARN-6443
>                 URL: https://issues.apache.org/jira/browse/YARN-6443
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacity scheduler, fairscheduler
>            Reporter: Arun Suresh
>            Assignee: Hitesh Sharma
>
> Currently the Schedulers examine an applications pending Requests in Priority order.
This JIRA proposes to introduce a flag (either via the ApplicationMasterService::registerApplication()
or via some Scheduler configuration) to favor an ordering that is baised to the node that
is currently heartbeating by relaxing the priority constraint.



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