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https://issues.apache.org/jira/browse/YARN-6955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16116965#comment-16116965
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Botong Huang commented on YARN-6955:
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The unit test failures are irrelevant.
> Concurrent registerAM thread in Federation Interceptor
> ------------------------------------------------------
>
> Key: YARN-6955
> URL: https://issues.apache.org/jira/browse/YARN-6955
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Botong Huang
> Assignee: Botong Huang
> Priority: Minor
> Attachments: YARN-6955.v1.patch, YARN-6955.v2.patch
>
>
> The timeout between AM and AMRMProxy is shorter than the timeout + failOver
> between FederationInterceptor (AMRMProxy) and RM. When the first register
> thread in FI is blocked because of an RM failover, AM can timeout and resend
> register call, leading to two outstanding register call inside FI.
> Eventually when RM comes back up, one thread succeeds register and the other
> thread got an application already registered exception. FI should swallow the
> exception and return success back to AM in both threads.
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