Github user jiny2 commented on the issue:
https://github.com/apache/incubator-hawq/pull/1071
In fact some gucs are not used by reading from hawq-site.xml, for example,
hawq_master_directory. But for standby_addr_host, it is useful for RM as RM
switches its heart-beat to standby server when master server is not achievable.
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