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From "Xuan Gong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5440) Use AHSClient in YarnClient when TimelineServer is running
Date Wed, 27 Jul 2016 23:32:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396656#comment-15396656
] 

Xuan Gong commented on YARN-5440:
---------------------------------

Thanks for the review. [~gtCarrera9]

Created https://issues.apache.org/jira/browse/YARN-5442 to track the testcase failures.

bq. if the user turn off timeline service but enable AHS in the config.

So, the configuration: yarn.timeline-service.generic-application-history.enabled is deprecated
configuration which means we could remove this configuration without any impact (If i understand
the deprecate correctly). In current code base, this configuration controls whether we could
get the full information (include current and history) for the apps/attempts/containers by
using YarnClient. But the pre-requirement is that we have to run the TimelineServer. If we
turn off the timeline server but enable AHS, it would give the connection exception because
it tries to connect the ATS.

> Use AHSClient in YarnClient when TimelineServer is running
> ----------------------------------------------------------
>
>                 Key: YARN-5440
>                 URL: https://issues.apache.org/jira/browse/YARN-5440
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.9.0
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-5440.1.patch
>
>
> In YarnClient, depends on whether we enable yarn.timeline-service.generic-application-history.enabled,
the AHSClient will be used or not. But the AHSClientService is enabled by default when we
start the TimelineServer which means we are able to get history information for applications/applicationAttempts/containers
by using ahsClient when the TimelineServer is running. So, we do not have to rely on this
deprecated configuration to get history information by using YarnClient.



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