Jian He commented on YARN-2211:

- AMRMTokenSecretManagerState class is not needed. we may just use 
AMRMTokenSecretManagerStateData and rename AMRMTokenSecretManagerStateData to 
AMRMTokenSecretManagerState. we should probably remove other ApplicationState 
etc. in a different jira too.
- Fix the naming, similarly  
   *        |----- currentTokenMasterKey
   *        |----- nextTokenMasterKey
- existsWithRetries(amrmTokenSecretManagerRoot, true) != null; change to use 
isUpdate flag

> RMStateStore needs to save AMRMToken master key for recovery when RM 
> restart/failover happens 
> ----------------------------------------------------------------------------------------------
>                 Key: YARN-2211
>                 URL: https://issues.apache.org/jira/browse/YARN-2211
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-2211.1.patch, YARN-2211.2.patch, YARN-2211.3.patch, 
> YARN-2211.4.patch, YARN-2211.5.1.patch, YARN-2211.5.patch
> After YARN-2208, AMRMToken can be rolled over periodically. We need to save 
> related Master Keys and use them to recover the AMRMToken when RM 
> restart/failover happens

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