Xuan Gong commented on YARN-2383:

Make the ClientToAMToken renewable after a configurable period of time. AM will 
send the renewDate in allocate call. RM can send back the new renewDate if 
needed thru the allocate.
At AM side, create a ClientToAMTokenCache ,which is singleton. The  
ClientToAMTokenCache is used to save the master-key and renewDate of the 
ClientToAMToken, and the ClientToAMTokenCache will be used in 
ClientToAMTokenSecretManager in AM side to help save and retrieve the 
master-key. With using ClientToAMTokenCache, we do not need to change any 
public API and codes in both AM and client.

> Add ability to renew ClientToAMToken
> ------------------------------------
>                 Key: YARN-2383
>                 URL: https://issues.apache.org/jira/browse/YARN-2383
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: applications, resourcemanager
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-2383.preview.1.patch

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