Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2275
YARNSessionFIFOSecuredITCase gives me the following:
>17:49:58,097 INFO SecurityLogger.org.apache.hadoop.ipc.Server
- Auth successful for appattempt_1471880990715_0001_000001 (auth:SIMPLE)
It is not using Kerberos it seems. We should check that security is really
enabled and fail the test if not.
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