Github user interma commented on the issue:
https://github.com/apache/incubator-hawq/pull/1262
I was going to use `setProperty("java.security.auth.login.config",
conf_file)`, but it not works.
After refer some ranger code, it seems ranger do some hacks by
org.apache.ranger.audit.utils.InMemoryJAASConfiguration, so I use the same
class as Ranger does.
Tested on my test vagrant cluster, passed.
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