Jason Lowe commented on YARN-2152:

Yeah that's what I suspected as well, but I wanted to mention it in case I 
missed something.  It's crucial we get the token compatibility sorted out 
sooner rather than later, otherwise I can see us regularly breaking 
compatibility between even minor versions as we tweak tokens to add features.  
Whenever that happens rolling upgrades will not work in practice.

> Recover missing container information
> -------------------------------------
>                 Key: YARN-2152
>                 URL: https://issues.apache.org/jira/browse/YARN-2152
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Jian He
>            Assignee: Jian He
>             Fix For: 2.5.0
>         Attachments: YARN-2152.1.patch, YARN-2152.1.patch, YARN-2152.2.patch, 
> YARN-2152.3.patch
> Container information such as container priority and container start time 
> cannot be recovered because NM container today lacks such container 
> information to send across on NM registration when RM recovery happens

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