Botong Huang updated YARN-6955:
    Attachment: YARN-6955.v2.patch

> 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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