protected String getClusterName() throws AmbariException {
    ExecutionCommand executionCommand = getExecutionCommand();
    String clusterName = (executionCommand == null) ? null : executionCommand.getClusterName();

    if ((clusterName == null) || clusterName.isEmpty()) {
      throw new AmbariException("Failed to retrieve the cluster name from the execution command");
    }

    return clusterName;
  }
Returns the relevant cluster's name
<p/>
Using the data from the execution command, retrieve the relevant cluster's name.

@return a String declaring the relevant cluster's name
@throws AmbariException if the cluster's name is not available
ambari-server/src/main/java/org/apache/ambari/server/serveraction/kerberos/KerberosServerAction.java