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https://issues.apache.org/jira/browse/YARN-4178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14933506#comment-14933506
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Varun Saxena commented on YARN-4178:
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Also for the sake of consistency, I have done the conversion wherever app id is 
used in row key even though it might not be necessary like in app to flow table.

> [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
>         Attachments: YARN-4178-YARN-2928.01.patch
>
>
> 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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