[jira] [Created] (YARN-8933) [AMRMProxy] Fix potential null AvailableResource and NumClusterNode in allocation response

["Botong Huang (JIRA)" <ji...@apache.org>]

Botong Huang created YARN-8933:
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             Summary: [AMRMProxy] Fix potential null AvailableResource and NumClusterNode in allocation response
                 Key: YARN-8933
                 URL: https://issues.apache.org/jira/browse/YARN-8933
             Project: Hadoop YARN
          Issue Type: Task
            Reporter: Botong Huang
            Assignee: Botong Huang


After YARN-8696, the allocate response by FederationInterceptor is merged from the responses from a random subset of all sub-clusters, depending on the async heartbeat timing. As a result, cluster-wide information fields in the response, e.g. AvailableResources and NumClusterNodes, are not consistent at all. It can even be null/zero because the specific response is merged from an empty set of sub-cluster responses. 

In this patch, we let FederationInterceptor remember the last allocate response from all known sub-clusters, and always construct the cluster-wide info fields from all of them. We also moved sub-cluster timeout from LocalityMulticastAMRMProxyPolicy to FederationInterceptor, so that sub-clusters that expired (haven't had a successful allocate response for a while) won't be included in the computation.



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