Github user rickysaltzer commented on the pull request:
https://github.com/apache/nifi/pull/253#issuecomment-194026785
@alopresto The `UserGroupInformation` is all referenced statically, and
before my changes the `UserGroupInformation.isSecurityEnabled()` method was
called at the time of `customValidate`. I'm not familiar enough with the way
`UserGroupInformation` works to know whether not `isSecurityEnabled()` can
change throughout the lifetime of a NiFi process. I added the change in order
to override that boolean during tests. @lordjc, do you know?
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