Jian He commented on YARN-2743:

bq. why is RMDelegationTokenIdentifier converted to proto? RM is the reader and 
writer for this ID, so no need for this to be a proto?
It’ll be useful in rolling upgrades, when RM1 and RM2 have different  versions 
of the RMDT. i.e. writer of RM1 and reader of RM2 are incompatible.
Fixed other comments.

> Yarn jobs via oozie fail with failed to renew token (secure) or digest 
> mismatch (unsecure) errors when RM is being killed
> -------------------------------------------------------------------------------------------------------------------------
>                 Key: YARN-2743
>                 URL: https://issues.apache.org/jira/browse/YARN-2743
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Arpit Gupta
>            Assignee: Jian He
>            Priority: Blocker
>         Attachments: YARN-2743.1.patch, YARN-2743.2.patch
> During our HA testing we have seen yarn jobs run via oozie fail with failed 
> to renew delegation token errors on secure clusters and digest mismatch 
> errors on un secure clusters

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