Li Lu created YARN-5739:

             Summary: Provide timeline reader API to list available timeline 
entity types for one application
                 Key: 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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