import org.apache.hadoop.tools.mapred.UniformSizeInputFormat; //导入依赖的package包/类
/**
 * Returns the class that implements a copy strategy. Looks up the implementation for
 * a particular strategy from distcp-default.xml
 *
 * @param conf - Configuration object
 * @param options - Handle to input options
 * @return Class implementing the strategy specified in options.
 */
public static Class<? extends InputFormat> getStrategy(Configuration conf,
                                                               DistCpOptions options) {
  String confLabel = "distcp."
      + StringUtils.toLowerCase(options.getCopyStrategy())
      + ".strategy" + ".impl";
  return conf.getClass(confLabel, UniformSizeInputFormat.class, InputFormat.class);
}
 

import org.apache.hadoop.tools.mapred.UniformSizeInputFormat; //导入依赖的package包/类
/**
 * Returns the class that implements a copy strategy. Looks up the implementation for
 * a particular strategy from distcp-default.xml
 *
 * @param conf - Configuration object
 * @param options - Handle to input options
 * @return Class implementing the strategy specified in options.
 */
public static Class<? extends InputFormat> getStrategy(Configuration conf,
                                                               DistCpOptions options) {
  String confLabel = "distcp." +
      options.getCopyStrategy().toLowerCase(Locale.getDefault()) + ".strategy.impl";
  return conf.getClass(confLabel, UniformSizeInputFormat.class, InputFormat.class);
}