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https://issues.apache.org/jira/browse/YARN-752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13683703#comment-13683703
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Sandy Ryza commented on YARN-752:
---------------------------------

Attached a rebased patch.

bq. Not blocking this patch, but that doesn't seem right. All schedulers MUST 
handle it. AMs shouldn't be burdened with coding for a specific scheduler.

OK, making this required sounds reasonable to me.  We can continue the 
discussion on YARN-521?
                
> In AMRMClient, automatically add corresponding rack requests for requested 
> nodes
> --------------------------------------------------------------------------------
>
>                 Key: YARN-752
>                 URL: https://issues.apache.org/jira/browse/YARN-752
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: api, applications
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: YARN-752-1.patch, YARN-752-1.patch, YARN-752-2.patch, 
> YARN-752.3.patch, YARN-752.4.patch, YARN-752-5.patch, YARN-752-6.patch, 
> YARN-752-7.patch, YARN-752.patch
>
>
> A ContainerRequest that includes node-level requests must also include 
> matching rack-level requests for the racks that those nodes are on.  When a 
> node is present without its rack, it makes sense for the client to 
> automatically add the node's rack.

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