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https://issues.apache.org/jira/browse/YARN-10087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prabhu Joseph reassigned YARN-10087:
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Assignee: Tanu Ajmera
> 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
> Assignee: Tanu Ajmera
> Priority: Major
> Labels: newbie
> 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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