protected static Map<String, String> createConstructorMetaData(int threshold, float loadFactor) {
    Map<String, String> metaData = new HashMap<String, String>();
    metaData.put(THESHOLD_NAME, String.valueOf(threshold));
    metaData.put(LOAD_NAME, String.valueOf(loadFactor));
    return metaData;
  }
Creates metadata for implementation classes' ctors from threshold and load factor.
ql/src/java/org/apache/hadoop/hive/ql/exec/persistence/AbstractMapJoinTableContainer.java