code: public boolean isExternalizable(final ServerInformation serverInformation) {
          if (serverInformation == null) {
              return false;
          }
  
          if (serverInformation instanceof HadoopClusterInformation) {
              return true;
          }
  
          return false;
      }
docs: Determines if the given datastore is externalizable by this object.
  
  @param serverInformation
  @return