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From "Naganarasimha G R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4183) Enabling generic application history forces every job to get a timeline service delegation token
Date Sat, 14 Nov 2015 02:18:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-4183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15005090#comment-15005090

Naganarasimha G R commented on YARN-4183:

Yes, [~sjlee0] & [~gtCarrera], There are too many points to discuss wrt versions. But
i felt scope of this jira was more on whether to have *"yarn.timeline-service.enabled"* is
required in RM's SystemMetricsPublisher. Which i feel we need to stick to, as viewers of this
jira might get confused is scope is more . And raise a new jira which can be subtask of 1.5
or 2 and discuss the pro's cons of multiple ATS versions to be supported. If OK will raise
one in 1.5

bq.  I believe it strongly implies it applies to the server-side too. After all, even if it
is indicated to the client that the timeline service is enabled, it would be no use obviously
(and actually worse than not indicating) if the timeline service was not running. 
Well once we move to 1.5  and 2 we will anyway have some form of {{"yarn.timeline-service.version"}}
which signify that Server needs to start timelineserver and RM's SMP will know whether to
publish to timelineserver if the version is set.
But as far as 2.7.2 is concerned i feel {{yarn.resourcemanager.system-metrics-publisher.enabled}}
is sufficient to be configured. If not unnecessary additional configuration needs to be done
by the admin.
As far as i view it "yarn.timeline-service.enabled"* name is misleading, it should be more
to signify client requires the timeline service's delegation token. Which will  not be a server
side config. Thoughts?

> Enabling generic application history forces every job to get a timeline service delegation
> ------------------------------------------------------------------------------------------------
>                 Key: YARN-4183
>                 URL: https://issues.apache.org/jira/browse/YARN-4183
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>            Reporter: Mit Desai
>            Assignee: Mit Desai
>         Attachments: YARN-4183.1.patch
> When enabling just the Generic History Server and not the timeline server, the system
metrics publisher will not publish the events to the timeline store as it checks if the timeline
server and system metrics publisher are enabled before creating a timeline client.
> To make it work, if the timeline service flag is turned on, it will force every yarn
application to get a delegation token.
> Instead of checking if timeline service is enabled, we should be checking if application
history server is enabled.

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