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https://issues.apache.org/jira/browse/YARN-8010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16399177#comment-16399177
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Subru Krishnan commented on YARN-8010:
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Thanks [~botong] for the patch and [~giovanni.fumarola] for reviewing it.
Do you want this in trunk/branch-2 or or YARN-7402?
> add config in FederationRMFailoverProxy to not bypass facade cache when
> failing over
> ------------------------------------------------------------------------------------
>
> Key: YARN-8010
> URL: https://issues.apache.org/jira/browse/YARN-8010
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Botong Huang
> Assignee: Botong Huang
> Priority: Minor
> Attachments: YARN-8010.v1.patch, YARN-8010.v1.patch,
> YARN-8010.v2.patch, YARN-8010.v3.patch
>
>
> Today when YarnRM is failing over, the FederationRMFailoverProxy running in
> AMRMProxy will perform failover, try to get latest subcluster info from
> FederationStateStore and then retry connect to the latest YarnRM master. When
> calling getSubCluster() to FederationStateStoreFacade, it bypasses the cache
> with a flush flag. When YarnRM is failing over, every AM heartbeat thread
> creates a different thread inside FederationInterceptor, each of which keeps
> performing failover several times. This leads to a big spike of getSubCluster
> call to FederationStateStore.
> Depending on the cluster setup (e.g. putting a VIP before all YarnRMs),
> YarnRM master slave change might not result in RM addr change. In other
> cases, a small delay of getting latest subcluster information may be
> acceptable. This patch thus creates a config option, so that it is possible
> to ask the FederationRMFailoverProxy to not flush cache when calling
> getSubCluster().
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