Jason Lowe updated YARN-3104:
    Attachment: YARN-3104.001.patch

As discussed in YARN-2314 the IPC layer makes it near impossible to close the 
connection, and there's no support for re-negotiating the authentication of the 

This patch isn't a total fix, since it doesn't address the issue of 
re-authenticating the connection using the new token.  However it does prevent 
the RM from constantly generating tokens during the period between rolling and 
activating the next AMRM key and the corresponding three lines of logging per 
application per second.

> RM continues to send new AMRM tokens every heartbeat between rolling and 
> activation
> -----------------------------------------------------------------------------------
>                 Key: YARN-3104
>                 URL: https://issues.apache.org/jira/browse/YARN-3104
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>         Attachments: YARN-3104.001.patch
> When the RM rolls a new AMRM secret, it conveys this to the AMs when it 
> notices they are still connected with the old key.  However neither the RM 
> nor the AM explicitly close the connection or otherwise try to reconnect with 
> the new secret.  Therefore the RM keeps thinking the AM doesn't have the new 
> token on every heartbeat and keeps sending new tokens for the period between 
> the key roll and the key activation.  Once activated the RM no longer squawks 
> in its logs about needing to generate a new token every heartbeat (i.e.: 
> second) for every app, but the apps can still be using the old token.  The 
> token is only checked upon connection to the RM.  The apps don't reconnect 
> when sent a new token, and the RM doesn't force them to reconnect by closing 
> the connection.

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