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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-392) Make it possible to specify hard locality constraints in resource requests
Date Mon, 20 May 2013 19:27:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13662302#comment-13662302
] 

Sandy Ryza commented on YARN-392:
---------------------------------

The crisp definition I had in mind was: "if disableAllocation=true for a ResourceRequest,
don't use that ResourceRequest by itself for an allocation."  The alternative is "if disableAllocation=true
for a ResourceRequest at a network hierarchy level, then do not relax locality beyond that
level."  I think both of these are crisp, and I would be ok with both of them.  How about:
I remove that line in the scheduler that honors the property on node-level requests.  We document
that the flag is not supported on node-level requests.  If we wish to, in a followup JIRA
we can decide that setting the flag on a node-level request warrants an exception.  Or, in
a followup JIRA, we can decide that setting the flag on a node-level request is supported.
 Neither of these future changes will be a backwards-incompatible change.


                
> Make it possible to specify hard locality constraints in resource requests
> --------------------------------------------------------------------------
>
>                 Key: YARN-392
>                 URL: https://issues.apache.org/jira/browse/YARN-392
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Bikas Saha
>            Assignee: Sandy Ryza
>         Attachments: YARN-392-1.patch, YARN-392-2.patch, YARN-392-2.patch, YARN-392-2.patch,
YARN-392-3.patch, YARN-392-4.patch, YARN-392.patch
>
>
> Currently its not possible to specify scheduling requests for specific nodes and nowhere
else. The RM automatically relaxes locality to rack and * and assigns non-specified machines
to the app.

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