Vrushali C updated YARN-3984:
    Attachment: YARN-3984-YARN-2928.001.patch

Attached patch v001 as per above discussions.

One change is that, if the event info map is empty, only then the column with 
no event key/value is written. If the info map is not empty, this record would 
be redundant and will take up storage space. 

> 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
>         Attachments: YARN-3984-YARN-2928.001.patch
> 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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