Github user dbahir commented on the issue:
https://github.com/apache/phoenix/pull/203
If you look at
https://github.com/hanborq/hadoop/blob/master/src/core/org/apache/hadoop/security/UserGroupInformation.java
you can see that this class is not thread safe and not designed to have
different users login in the same JVM as loginUser is defined in this way.
private static UserGroupInformation loginUser = null;
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