public void setLocalUsername(String localUsername) {
    this.localUsername = localUsername;
  }
Sets the local username associated with this principal

@param localUsername a String indicating the local username related to this principal, or null
                     of no local mapping is needed/available
ambari-server/src/main/java/org/apache/ambari/server/state/kerberos/KerberosPrincipalDescriptor.java