grib/src/main/java/ucar/nc2/grib/collection/GribCollectionBuilder.java
boolean createIndex(FeatureCollectionConfig.PartitionType ptype, Formatter errlog) throws IOException {
    if (ptype == FeatureCollectionConfig.PartitionType.all)
      return createAllRuntimeCollections(errlog);
    else
      return createMultipleRuntimeCollections(errlog);
  }
boolean createIndex(FeatureCollectionConfig.PartitionType ptype, Formatter errlog) throws IOException {
    if (ptype == FeatureCollectionConfig.PartitionType.all)
      return createAllRuntimeCollections(errlog);
    else
      return createMultipleRuntimeCollections(errlog);
  }
Throw exception if failure