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From "Jonathan Eagles (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, 05 Oct 2015 18:57:27 GMT

    [ https://issues.apache.org/jira/browse/YARN-4183?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14943832#comment-14943832
] 

Jonathan Eagles commented on YARN-4183:
---------------------------------------

[~xgong], this issue is two-fold. 1) The web services publishing should trigger posting history
based on generic history enablement and not timeline server enablement. 2) There is still
no separation between timeline clients that require delegation tokens and those that don't.
See YARN-3942. As a result, if timelineservice is enabled at the global level, then each yarn
client will get a timeline delegation token which makes the timeline service a live dependency.
Meaning if the timeline service is down, then the grid is down.

This patch above is a clean way to avoid enabling the timeline service for all YarnClients
in the cluster.

> 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
>         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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