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https://issues.apache.org/jira/browse/YARN-8697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16595703#comment-16595703
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Giovanni Matteo Fumarola commented on YARN-8697:
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Thanks [~botong] . The change is straightforward. 
Committed in trunk.

> LocalityMulticastAMRMProxyPolicy should fallback to random sub-cluster when 
> cannot resolve resource
> ---------------------------------------------------------------------------------------------------
>
>                 Key: YARN-8697
>                 URL: https://issues.apache.org/jira/browse/YARN-8697
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Botong Huang
>            Assignee: Botong Huang
>            Priority: Major
>             Fix For: 3.2.0
>
>         Attachments: YARN-8697.v1.patch, YARN-8697.v2.patch
>
>
> Right now in LocalityMulticastAMRMProxyPolicy, whenever we cannot resolve the 
> resource name (node or rack), we always route the request to home 
> sub-cluster. However, home sub-cluster might not be always be ready to use 
> (timed out YARN-8581) or enabled (by AMRMProxyPolicy weights). It might also 
> be overwhelmed by the requests if sub-cluster resolver has some issue. In 
> this Jira, we are changing it to pick a random active and enabled sub-cluster 
> for resource request we cannot resolve. 



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