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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4183) Enabling generic application history forces every job to get a timeline service delegation token
Date Mon, 09 Nov 2015 20:08:11 GMT

    [ https://issues.apache.org/jira/browse/YARN-4183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14997267#comment-14997267
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Sangjin Lee commented on YARN-4183:
-----------------------------------

Sorry I missed this one as well.

Maybe this is a FAQ somewhere, but what are the relationships among the following 3 settings?
# yarn.timeline-service.enabled
# yarn.timeline-service.generic-application-history.enabled
# yarn.resourcemanager.system-metrics-publisher.enabled

Can (1) and (2) be set independently, or does setting one have an implication on the other?
How about (3)?

>From the v.2 perspective, there is no separate "generic application history service" any
way, and we will have to handle this problem in a different manner.

> Enabling generic application history forces every job to get a timeline service delegation
token
> ------------------------------------------------------------------------------------------------
>
>                 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
>             Fix For: 3.0.0, 2.8.0, 2.7.2
>
>         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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