Kurt Young closed FLINK-4806.
    Resolution: Won't Fix

> ResourceManager stop listening JobManager's leader address
> ----------------------------------------------------------
>                 Key: FLINK-4806
>                 URL: https://issues.apache.org/jira/browse/FLINK-4806
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Cluster Management
>            Reporter: Kurt Young
> Currently in flip-6 branch, when RM receives a registration from JM, it will 
> verify the leader session id of JM and attach a JobManagerLeaderListener with 
> it for monitoring the future changes. 
> Maybe we can simplify it a little bit. We don't monitor the leadership change 
> of the JM, after the verification passed when JM registered itself, we simply 
> write down the leader id of the registered the JM for future rpc filtering, 
> and start heartbeat monitor with JM. 
> If JM's leadership has been changed, the new JM will register itself, and RM 
> will verify its leadership when received registration, and RM can decide 
> whether accept or reject the registration. It's kind of like JM's information 
> in RM is preempted only by new JM but not by RM itself with leadership change 
> listener. By doing this, we can simplify the logic inside RM and don't have 
> to do any error handling with leader listener. 

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