Xuan Gong commented on YARN-3700:

bq. getAllApplications -> getApplications?


bq. Can we use -1 or 0 instead of Long.MAX_VALUE to indicate appsNum not 

Can not. The default value for GetApplicationsRequest-->getLimit() is 

Also, test the patch locally.
* Set yarn.timeline-service.generic-application-history.max-applications as 1
* run two MR pi examples
* go to http://localhost:8188/applicationhistory/apps and 
http://localhost:8188/ws/v1/applicationhistory/apps. Both of them are showing 
only one application which is the latest application
* http://localhost:8188/applicationhistory/apps?apps.num=2 and 
http://localhost:8188/ws/v1/applicationhistory/apps?limit=2. Both of them are 
showing two applications

> ATS Web Performance issue at load time when large number of jobs
> ----------------------------------------------------------------
>                 Key: YARN-3700
>                 URL: https://issues.apache.org/jira/browse/YARN-3700
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager, webapp, yarn
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-3700.1.patch, YARN-3700.2.1.patch, 
> YARN-3700.2.2.patch, YARN-3700.2.patch, YARN-3700.3.patch, YARN-3700.4.patch
> Currently, we will load all the apps when we try to load the yarn 
> timelineservice web page. If we have large number of jobs, it will be very 
> slow.

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