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https://issues.apache.org/jira/browse/YARN-752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13673512#comment-13673512
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Bikas Saha commented on YARN-752:
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I was going to open a jira for the second option actually. Given yarn's
defaults on relaxing locality etc. it makes sense for the client to
automatically add racks when a node is present without its rack. So users can
specify mix of nodes and racks and the client will fill in missing racks for
the nodes if needed. If strict locality is enabled then it will not add the
racks.
If anyone knows the node to rack mapping (as understood by the RM and thats
what matters) then its the amrmclient.
It is perfectly valid for users to specify nodes without racks to amrmclient.
> Throw exception if AMRMClient.ContainerRequest is given invalid locations
> -------------------------------------------------------------------------
>
> 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
>
> A ContainerRequest that includes node-level requests must also include
> matching rack-level requests for the racks that those nodes are on. At the
> very least, an exception should be thrown if one is constructed with a
> non-empty set of nodes but an empty set of racks.
> If possible, it would also be nice to validate that the given nodes are on
> the racks that are given. Although if that is possible, then it might be
> even better to just automatically fill in racks for nodes.
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