Andrew Purtell created HBASE-20109: -------------------------------------- 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)