JobConf.java 文件源码

/**
 * Get the {@link RawComparator} comparator used to compare keys.
 * 
 * @return the {@link RawComparator} comparator used to compare keys.
 */
public RawComparator getOutputKeyComparator() {
  Class<? extends RawComparator> theClass = getClass(
    JobContext.KEY_COMPARATOR, null, RawComparator.class);
  if (theClass != null)
    return ReflectionUtils.newInstance(theClass, this);
  return WritableComparator.get(getMapOutputKeyClass().asSubclass(WritableComparable.class), this);
}