docs: public static void dumpClusterToFile(String outputDirName, String fileName, Cluster cluster) {
  
          if(outputDirName != null) {
              File outputDir = new File(outputDirName);
              if(!outputDir.exists()) {
                  Utils.mkdirs(outputDir);
              }
  
              try {
                  FileUtils.writeStringToFile(new File(outputDirName, fileName),
                                              new ClusterMapper().writeCluster(cluster));
              } catch(IOException e) {
                  logger.error("IOException during dumpClusterToFile: " + e);
              }
          }
      }