Young Chen commented on YARN-7707:

This contains the framework for the policy generator service in the 
GlobalPolicyGenerator. It periodically runs at configurable intervals, and 
invokes an instance of GlobalPolicy. The GlobalPolicy specifies which RM 
endpoints it is interested in via registerPaths, and the PolicyGenerator will 
query those endpoints and provide the requested information in updatePolicy. 

This enables the PolicyGenerator to handle making the actual REST calls and 
aggregating information.

The policies are written into the FederationStateStore, where it can be picked 
up by the AMRMProxy and the Router. 

> [GPG] Policy generator framework
> --------------------------------
>                 Key: YARN-7707
>                 URL: https://issues.apache.org/jira/browse/YARN-7707
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Carlo Curino
>            Assignee: Young Chen
>            Priority: Major
>              Labels: federation, gpg
>         Attachments: YARN-7707-YARN-7402.01.patch
> This JIRA tracks the development of a generic framework for querying 
> sub-clusters for metrics, running policies, and updating them in the 
> FederationStateStore.

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