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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