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https://issues.apache.org/jira/browse/YARN-4356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15010094#comment-15010094
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Sangjin Lee commented on YARN-4356:
-----------------------------------

I haven't looked at YARN-4234 in detail yet. Are you referring to the version 
config?

One thing we need to resolve early is whether we should support having both 
v.1.x and v.2 enabled. While I see value in being able to do so, I recognize 
that it would be a pretty major rework, as the current code is making a strong 
assumption of this being a binary choice (mutually exclusive). cc 
[~jrottinghuis]

Also, as I was arguing on YARN-4183, if the v.2 timeline service is disabled 
(whichever config it may be), it would be desirable to disable the v.2 code 
cleanly and as early as possible so as not to leave impact. It would be 
basically "wiring off" the feature.

Once we have some consensus around it, we can start work on this.

> ensure the timeline service v.2 is disabled cleanly and has no impact when 
> it's turned off
> ------------------------------------------------------------------------------------------
>
>                 Key: YARN-4356
>                 URL: https://issues.apache.org/jira/browse/YARN-4356
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>            Priority: Critical
>              Labels: yarn-2928-1st-milestone
>
> For us to be able to merge the first milestone drop to trunk, we want to 
> ensure that once disabled the timeline service v.2 has no impact from the 
> server side to the client side. If the timeline service is not enabled, no 
> action should be done. If v.1 is enabled but not v.2, v.1 should behave the 
> same as it does before the merge.



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