Siddharth Seth commented on YARN-752:

Can we make this rack resolution optional
1) If the user has provided racks - just trust that information instead of 
resolving and then checking whether the user has provided the correct 
2) Does it make sense to have an option to disable this automatic resolution. I 
haven't been following the whitelisting / blacklisting closely - but isn't it 
possible for users to ask for specific hosts, without specifying racks 
(Ignoring scheduler implementation here)
> 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.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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