Jian He commented on YARN-2588:

Thanks for updating !
bq. I thought of removing completely activeservice initializition for 
trainsitionToStandby, but it has potential dependency on starting RMWebApp. I 
do not know why RMWebbApp has dependency on activeServices for starting in 
standby mode.
Didn't quite get what you mean. RMWebApp is started in both standby and active.

> Standby RM does not transitionToActive if previous transitionToActive is 
> failed with ZK exception.
> --------------------------------------------------------------------------------------------------
>                 Key: YARN-2588
>                 URL: https://issues.apache.org/jira/browse/YARN-2588
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 3.0.0, 2.6.0, 2.5.1
>            Reporter: Rohith
>            Assignee: Rohith
>         Attachments: YARN-2588.1.patch, YARN-2588.patch
> Consider scenario where, StandBy RM is failed to transition to Active because 
> of ZK exception(connectionLoss or SessionExpired). Then any further 
> transition to Active for same RM does not move RM to Active state.

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