Naganarasimha G R commented on YARN-2522:

As per discussion in [YARN-2838] Need to handle this issue also 
In YARNClientIMPL;history data can be either got from HistoryServer (old 
manager) or from TimeLineServer (new)
So historyServiceEnabled flag needs to check for both Timeline server 
configurations and ApplicationHistoryServer configurations, as data can be got 
from either of them.

> AHSClient may be not necessary
> ------------------------------
>                 Key: YARN-2522
>                 URL: https://issues.apache.org/jira/browse/YARN-2522
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
> Per discussion in 
> [YARN-2033|https://issues.apache.org/jira/browse/YARN-2033?focusedCommentId=14126073&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14126073],
>  it may be not necessary to have a separate AHSClient. The methods can be 
> incorporated into TimelineClient. APPLICATION_HISTORY_ENABLED is also useless 
> then.

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