[jira] [Created] (HBASE-20109) Add Admin#getMasterAddress API for lightweight discovery of the active master location

["Andrew Purtell (JIRA)" <ji...@apache.org>]

Andrew Purtell created HBASE-20109:
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             Summary: Add Admin#getMasterAddress API for lightweight discovery of the active master location
                 Key: HBASE-20109
                 URL: https://issues.apache.org/jira/browse/HBASE-20109
             Project: HBase
          Issue Type: Improvement
          Components: Client
            Reporter: Andrew Purtell
            Assignee: Andrew Purtell
             Fix For: 2.0.0, 1.5.0


Right now the only public API available to the client to learn the server name of the active master is Admin#getClusterStatus#getMaster, returning ServerName. On a cluster of any size getClusterStatus is expensive, especially if used only to retrieve the active master name. 

Let's add a simple API 

{code}
ServerName Admin#getMasterAddress()
{code}

for lightweight discovery of the active master location. This makes sense because, weirdly, Admin already has a method getMasterInfoPort(), returning int. 

Internally the client has a notion of the active master because there is a connection open to it, or one that can be reopened, or if for some reason it's not easy to make a ServerName for that state, the ServerName can be deserialized out of the znode tracking the active master location.



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