Wilfred Spiegelenburg updated YARN-10087:
    Attachment: ats_stack.txt

> ATS possible NPE on REST API when data is missing
> -------------------------------------------------
>                 Key: YARN-10087
>                 URL: https://issues.apache.org/jira/browse/YARN-10087
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: ATSv2
>            Reporter: Wilfred Spiegelenburg
>            Priority: Major
>         Attachments: ats_stack.txt
> If the data stored by the ATS is not complete REST calls to the ATS can 
> return a NPE instead of results.
> {{{"exception":"NullPointerException","javaClassName":"java.lang.NullPointerException"}}}
> The issue shows up when the ATS was down for a short period and in that time 
> new applications were started. This causes certain parts of the application 
> data to be missing in the ATS store. In most cases this is not a problem and 
> data will be returned but when you start filtering data the filtering fails 
> throwing the NPE.
>  In this case the request was for: 
> {{http://<ATS-IP>:8188/ws/v1/applicationhistory/apps?user=hive'}}
> If certain pieces of data are missing the ATS should not even consider 
> returning that data, filtered or not. We should not display partial or 
> incomplete data.
>  In case of the missing user information ACL checks cannot be correctly 
> performed and we could see more issues.
> A similar issue was fixed in YARN-7118 where the queue details were missing. 
> It just _skips_ the app to prevent the NPE but that is not the correct thing 
> when the user is missing

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