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From "Li Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5739) Provide timeline reader API to list available timeline entity types for one application
Date Thu, 20 Oct 2016 20:36:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-5739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15592927#comment-15592927
] 

Li Lu commented on YARN-5739:
-----------------------------

We may not want to introduce another table for storing entity types for each application since
this bothers the write path a lot. Considering this is a relatively rare use case in a cluster,
we would rather put most of the burden on the reader side. I got some offline discussion with
Enis from HBase community, and it seems like we can provide a custom filter on the storage
layer to "jump" on a scan. In this way, we can quickly jump over all entities within one application,
just grabbing out different entity types. 

In this JIRA we also need to add endpoints serving this data. 

> 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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