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https://issues.apache.org/jira/browse/YARN-5739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15577111#comment-15577111
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Rohith Sharma K S commented on YARN-5739:
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Thanks Li Lu for raising a JIRA. This is one of the many folks major concern(I
missed too in meetings) while I was briefing about REST end points available in
ATSv2. They are expecting somewhat like REST end point like
*/apps/appid/entities*.
One option would be maintaining separate mapping table
application->list-of-all-entites. If we scan entity table then it is required
to filter it out by reader since it scans all the application/ row-keys. May be
need to discuss more on this supporting this API and its solutions.
> Provide timeline reader API to list available timeline entity types for one
> application
> ---------------------------------------------------------------------------------------
>
> Key: YARN-5739
> URL: https://issues.apache.org/jira/browse/YARN-5739
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelinereader
> Reporter: Li Lu
> Assignee: Li Lu
>
> Right now we only show a part of available timeline entity data in the new
> YARN UI. However, some data (especially library specific data) are not
> possible to be queried out by the web UI. It will be appealing for the UI to
> provide an "entity browser" for each YARN application. Actually, simply
> dumping out available timeline entities (with proper pagination, of course)
> would be pretty helpful for UI users.
> On timeline side, we're not far away from this goal. Right now I believe the
> only thing missing is to list all available entity types within one
> application. The challenge here is that we're not storing this data for each
> application, but given this kind of call is relatively rare (compare to
> writes and updates) we can perform some scanning during the read time.
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