Vinod Kumar Vavilapalli commented on YARN-752:

bq. Some additional explanation will be needed, but in general, I don't think 
all schedulers will be required to handle the relaxLocality flag.
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.

Anyways, Sandy, can you please update it? I'd like to get this in for 2.1.0 
that'll happen sometime soon.
> 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.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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