Sangjin Lee commented on YARN-3984:

In addition to the key composition, I find another significant problem with the 
event store schema. If the event doesn't contain any info, it will be ignored 
then. And we cannot always guarantee user will put something into info. For 
example, user may define a KILL event without any diagnostic msg.

Thanks for spotting that issue [~zjshen]. That's definitely a huge issue. We 
should address that as part of this JIRA...

> 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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