Vinod Kumar Vavilapalli commented on YARN-2562:

How about {{container_e17_1410901177871_0001_01_000005}}? A number at the end 
for me always pointed to the container-id. We also don't need to be verbose 
with "epoch". And we can still parse it in a backwards compatible fashion.

If nothing, my fourth preference is to have something like 
{{container_1410901177871_0001_01_000005_e17}}, the first three preferences are 
what I proposed above :P

> ContainerId@toString() is unreadable for epoch >0 after YARN-2182
> -----------------------------------------------------------------
>                 Key: YARN-2562
>                 URL: https://issues.apache.org/jira/browse/YARN-2562
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Tsuyoshi OZAWA
>            Priority: Critical
>         Attachments: YARN-2562.1.patch
> ContainerID string format is unreadable for RMs that restarted at least once 
> (epoch > 0) after YARN-2182. For e.g, 
> container_1410901177871_0001_01_000005_17.

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