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https://issues.apache.org/jira/browse/YARN-3984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14648499#comment-14648499
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Li Lu commented on YARN-3984:
-----------------------------

Hi [~vrushalic], one quick question. I'm a little bit confused by this:
bq. This would mean that we would never be able to query for a specific event.

Maybe here you're assuming that the timestamp information is missing for some 
of our use cases? Or else, because timestamp is one of the two parts of the id 
of timeline event, I'm not sure why we cannot directly locate that specific 
column? 

> Rethink event column key issue
> ------------------------------
>
>                 Key: YARN-3984
>                 URL: https://issues.apache.org/jira/browse/YARN-3984
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Vrushali C
>             Fix For: YARN-2928
>
>
> Currently, the event column key is event_id?info_key?timestamp, which is not 
> so friendly to fetching all the events of an entity and sorting them in a 
> chronologic order. IMHO, timestamp?event_id?info_key may be a better key 
> schema. I open this jira to continue the discussion about it which was 
> commented on YARN-3908.



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