There are two things that fix this class of problem for me:
1) Remove all "localhost" names, only have 127.0.0.1 pointing to the name of the hmaster node.
2) run "hostname X" on your hbase master node, to make sure the hostname matches what is in /etc/hosts.
Read full article from hadoop - Hbase: How to specify hostname for Hbase master - Stack Overflow
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