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https://issues.apache.org/jira/browse/YARN-5440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396675#comment-15396675
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Li Lu commented on YARN-5440:
-----------------------------

Thanks [~xgong]! LGTM. +1 for commit. 

> 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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