Naganarasimha G R commented on YARN-4425:

Further i tried to consider your comment ??I can understand why we need two 
separate policies, maybe we can consider to merge two policies to one: 
currently exclusivity of node label is just a hint, sharing policy could decide 
if and how much resources could be shared from each partition??,
Hope i got the comment right ?

> Pluggable sharing policy for Partition Node Label resources
> -----------------------------------------------------------
>                 Key: YARN-4425
>                 URL: https://issues.apache.org/jira/browse/YARN-4425
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacity scheduler, resourcemanager
>            Reporter: Naganarasimha G R
>            Assignee: Naganarasimha G R
>         Attachments: ResourceSharingPolicyForNodeLabelsPartitions-V1.pdf, 
> ResourceSharingPolicyForNodeLabelsPartitions-V2.pdf, 
> YARN-4425.20160105-1.patch
> As part of support for sharing NonExclusive Node Label partitions in 
> YARN-3214, NonExclusive partitions are shared only to Default Partitions and 
> also have fixed rule when apps in default partitions makes use of resources 
> of any NonExclusive partitions.
> There are many scenarios where in we require pluggable policy like 
> MutliTenant, Hierarchical etc.. where in each partition can determine when 
> they want to share the resources to other paritions and when other partitions 
> wants to use resources from others
> More details in the attached document.

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