Vinod Kumar Vavilapalli commented on YARN-2052:

Shouldn't epoch have a default value in the proto file? What is the default if 
it isn't provided? Thinking from backwards compatibility point of view..

> ContainerId creation after work preserving restart is broken
> ------------------------------------------------------------
>                 Key: YARN-2052
>                 URL: https://issues.apache.org/jira/browse/YARN-2052
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>             Fix For: 2.5.0
>         Attachments: YARN-2052.1.patch, YARN-2052.10.patch, 
> YARN-2052.11.patch, YARN-2052.12.patch, YARN-2052.2.patch, YARN-2052.3.patch, 
> YARN-2052.4.patch, YARN-2052.5.patch, YARN-2052.6.patch, YARN-2052.7.patch, 
> YARN-2052.8.patch, YARN-2052.9.patch, YARN-2052.9.patch
> Container ids are made unique by using the app identifier and appending a 
> monotonically increasing sequence number to it. Since container creation is a 
> high churn activity the RM does not store the sequence number per app. So 
> after restart it does not know what the new sequence number should be for new 
> allocations.

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