Rohith commented on YARN-1779:

This is critical issue for work preserving restart feature. AM can not connect 
to new RM because of proxy object is cached and token service is overwritten.
One approach to solve this by cloning the token object and add token to 
UserGroupInformation. Sample like below
    for (Token<? extends TokenIdentifier> token : UserGroupInformation
        .getCurrentUser().getTokens()) {
      if (token.getKind().equals(AMRMTokenIdentifier.KIND_NAME)) {
        Token<? extends TokenIdentifier> specificToken = new Token(token);
        SecurityUtil.setTokenService(specificToken, resourceManagerAddress);
Does it make sense?

> Handle AMRMTokens across RM failover
> ------------------------------------
>                 Key: YARN-1779
>                 URL: https://issues.apache.org/jira/browse/YARN-1779
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 2.3.0
>            Reporter: Karthik Kambatla
>            Priority: Blocker
>              Labels: ha
> Verify if AMRMTokens continue to work against RM failover. If not, we will 
> have to do something along the lines of YARN-986. 

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