Xuan Gong commented on YARN-4107:

bq. Is this when using ZKRMStateStore? If yes, the store should take care of 
transitioning the RM to standby via its FencingThread.

The main problem here is that the old active RM lost connections with all the 
zks. Even for the FencingThread, it still needs to reconnect to ZK, isn't it ?

> Both RM becomes Active if all zookeepers can not connect to active RM
> ---------------------------------------------------------------------
>                 Key: YARN-4107
>                 URL: https://issues.apache.org/jira/browse/YARN-4107
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-4107.1.patch
> Steps to reproduce:
> 1) Run small randomwriter applications in background
> 2) rm1 is active and rm2 is standby 
> 3) Disconnect all Zks and Active RM
> 4) Check status of both RMs. Both of them are in active state

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