Tsuyoshi OZAWA commented on YARN-2182:

s/Changed to prefix epoch to ContainerId#toString()/Updated 
ContainerId#toString() to suffix epoch/

> Update ContainerId#toString() to avoid conflicts before and after RM restart
> ----------------------------------------------------------------------------
>                 Key: YARN-2182
>                 URL: https://issues.apache.org/jira/browse/YARN-2182
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>         Attachments: YARN-2182.1.patch
> ContainerId#toString() doesn't include any information about current cluster 
> id. This leads conflict between container ids. We can avoid the conflicts 
> without breaking backward compatibility by using epoch introduced on 
> YARN-2052.

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