WrappedRecordReader.java 文件源码

public void initialize(InputSplit split,
                       TaskAttemptContext context)
throws IOException, InterruptedException {
  rr.initialize(split, context);
  conf = context.getConfiguration();
  nextKeyValue();
  if (!empty) {
    keyclass = key.getClass().asSubclass(WritableComparable.class);
    valueclass = value.getClass();
    if (cmp == null) {
      cmp = WritableComparator.get(keyclass, conf);
    }
  }
}