@Override
  public String getServerName() {
    ServerName serverName = master.getServerName();
    if (serverName == null) {
      return "";
    }
    return serverName.getServerName();
  }
Impl for exposing HMaster Information through JMX
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MetricsMasterWrapperImpl.java