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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 Wed, 05 Apr 2017 14:32:41 GMT

    [ https://issues.apache.org/jira/browse/YARN-6443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956947#comment-15956947
] 

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

Could you elaborate a bit on the use case where an application bothers to specify different
priorities for requests but is OK with having a lower priority request be allocated first
because locality was better?  Now that there are scheduler keys to help match allocations
back to their original requests, it seems priority really can be a priority rather than a
hack to help match them.  If the app doesn't really care what order two different kinds of
requests are given in as long as they have good locality, why not just submit them at the
same priority instead of having this extra flag?

> 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: Arun Suresh
>
> 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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