Hi, See (tail of) HBASE-17436 for detailed background information. Here is the summary:
In HBASE-17436 (and HBASE-19594), region state is accessed thru web UI. This is for helping operators gain better insight into the cluster status. However, since RegionState is marked @InterfaceAudience.Private , we (Appy and I) want to present this discussion to the community to raise awareness. Your comment is welcome.