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https://issues.apache.org/jira/browse/YARN-2052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030966#comment-14030966
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Vinod Kumar Vavilapalli commented on YARN-2052:
-----------------------------------------------

bq. e.g. container_XXX_1000 after epoch 1. 
This scheme won't work with a single reserved digit for epochs and a large 
number of restarts over time.

Here's my summary of what I think we should do:

The current ContainerID format is
{code}
ContainerID {
  applicationAttemptID
  containerIDInt
}
{code}
Let's just add a new field
{code}
+ rmIdentifier
{code}

Old code (state-store, history-server etc) will not read it and that's fine. 
The only problem is users who are interpreting container_ID strings themselves. 
That is NOT supported. We should modify ConverterUtils to support the 
new-field, and that should do.

Thoughts?

> 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
>
> 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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