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https://issues.apache.org/jira/browse/YARN-4178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14877046#comment-14877046
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Varun Saxena commented on YARN-4178:
------------------------------------

bq. we certainly have to store the application_ part.
I think we can use ApplicationId class for it. If prefix changes, ApplicationId 
will change as well. As I said above we can use Application#toString to 
reconvert it. Wouldn't it be fair to assume that any changes in application id 
format will be reflected in ApplicationId class.

> [storage implementation] app id as string can cause incorrect ordering
> ----------------------------------------------------------------------
>
>                 Key: YARN-4178
>                 URL: https://issues.apache.org/jira/browse/YARN-4178
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Varun Saxena
>
> Currently the app id is used in various places as part of row keys and in 
> column names. However, they are treated as strings for the most part. This 
> will cause a problem with ordering when the id portion of the app id rolls 
> over to the next digit.
> For example, "app_1234567890_100" will be considered *earlier* than 
> "app_1234567890_99". We should correct this.



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