Github user joshelser commented on the issue:
https://github.com/apache/phoenix/pull/203
> That is caused by UserInformationGroup loginUserFromKeytab being called
multiple time from different threads if using a multi threaded environment.
this fix ensures that there will only be one login per process.
`UGI.loginUserFromKeytab` never spawns a renewal thread so as it is. I
don't think this change has the effect you intend it to have.
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