protected String queryJmxBeanValue(String hostname, int port, String beanName, String attributeName,
                                  boolean asQuery) {
    return queryJmxBeanValue(hostname, port, beanName, attributeName, asQuery, false);
  }
Resolve the HBASE master and convert the hostname to lowercase.
ambari-server/src/main/java/org/apache/ambari/server/stack/MasterHostResolver.java