Wilfred Spiegelenburg created YARN-10087:
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Summary: 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
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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