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https://issues.apache.org/jira/browse/YARN-5715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15586168#comment-15586168
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Varun Saxena commented on YARN-5715:
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I think we can create a separate TimelineUtils class in hadoop-yarn-api or 
provide something in TimelineEntity to invert long, instead of moving 
LongConverter due to the point mentioned above. Thoughts ?

> introduce entity prefix for return and sort order
> -------------------------------------------------
>
>                 Key: YARN-5715
>                 URL: https://issues.apache.org/jira/browse/YARN-5715
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Rohith Sharma K S
>            Priority: Critical
>         Attachments: YARN-5715-YARN-5355.01.patch, 
> YARN-5715-YARN-5355.02.patch, YARN-5715-YARN-5355.03.patch
>
>
> While looking into YARN-5585, we have come across the need to provide a sort 
> order different than the current entity id order. The current entity id order 
> returns entities strictly in the lexicographical order, and as such it 
> returns the earliest entities first. This may not be the most natural return 
> order. A more natural return/sort order would be from the most recent 
> entities.
> To solve this, we would like to add what we call the "entity prefix" in the 
> row key for the entity table. It is a number (long) that can be easily 
> provided by the client on write. In the row key, it would be added before the 
> entity id itself.
> The entity prefix would be considered mandatory. On all writes (including 
> updates) the correct entity prefix should be set by the client so that the 
> correct row key is used. The entity prefix needs to be unique only within the 
> scope of the application and the entity type.
> For queries that return a list of entities, the prefix values will be 
> returned along with the entity id's. Queries that specify the prefix and the 
> id should be returned quickly using the row key. If the query omits the 
> prefix but specifies the id (query by id), the query may be less efficient.
> This JIRA should add the entity prefix to the entity API and add its handling 
> to the schema and the write path. The read path will be addressed in 
> YARN-5585.



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