Tsuyoshi OZAWA commented on YARN-2052:

Basically, I agree with the approach. If we take the sequence-number approach, 
we should define the behavior when sequence number overflows. One simple way is 
to fallback to RM-restart implemented in YARN-128. After changing the 
containerId/appId from integer to long,  it'll happen very rarely. [~jianhe], 
what do you think about the behavior?

> 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
>         Attachments: YARN-2052.1.patch, YARN-2052.2.patch, YARN-2052.3.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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