Github user EronWright commented on the issue:
https://github.com/apache/flink/pull/2864
@mxm I think the root cause was incorrectly diagnosed here, and as a result
this PR did the wrong thing. It is incorrect to bypass the UGI login methods
when in 'SIMPLE' auth mode.
For example, Flink uses the `HADOOP_USER_NAME` envvar to pass the client's
username from CLI to AppMaster to TaskManager; the HadoopSecurityContext must
be used to apply it. This PR wrecks havoc on scenarios like this.
I think the root cause in the MapR case is that MapR seems to rely on an
[actual JAAS config file](https://community.mapr.com/thread/9240), rather than
on stock Hadoop's in-memory JAAS configuration. The true solution may be to
merge the user-supplied JAAS with our in-memory defaults, thus obtaining the
`hadoop_simple` entry from `maps.login.conf`.
CC @tillrohrmann @vijikarthi
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