import org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.CompressAwarePath; //导入依赖的package包/类
@Override
public void commit() throws IOException {
  fs.rename(tmpOutputPath, outputPath);
  CompressAwarePath compressAwarePath = new CompressAwarePath(outputPath,
      getSize(), this.compressedSize);
  merger.closeOnDiskFile(compressAwarePath);
}
 

import org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.CompressAwarePath; //导入依赖的package包/类
@Override
public void commit() throws IOException {
  fs.rename(tmpOutputPath, outputPath);
  CompressAwarePath compressAwarePath = new CompressAwarePath(outputPath,
      getSize(), this.compressedSize);
  getMerger().closeOnDiskFile(compressAwarePath);
}
 

import org.apache.hadoop.mapreduce.task.reduce.MergeManagerImpl.CompressAwarePath; //导入依赖的package包/类
@SuppressWarnings({ "unchecked", "deprecation" })
@Test(timeout=10000)
public void testOnDiskMerger() throws IOException, URISyntaxException,
  InterruptedException {
  JobConf jobConf = new JobConf();
  final int SORT_FACTOR = 5;
  jobConf.setInt(MRJobConfig.IO_SORT_FACTOR, SORT_FACTOR);

  MapOutputFile mapOutputFile = new MROutputFiles();
  FileSystem fs = FileSystem.getLocal(jobConf);
  MergeManagerImpl<IntWritable, IntWritable> manager =
    new MergeManagerImpl<IntWritable, IntWritable>(null, jobConf, fs, null
      , null, null, null, null, null, null, null, null, null, mapOutputFile);

  MergeThread<MapOutput<IntWritable, IntWritable>, IntWritable, IntWritable>
    onDiskMerger = (MergeThread<MapOutput<IntWritable, IntWritable>,
      IntWritable, IntWritable>) Whitebox.getInternalState(manager,
        "onDiskMerger");
  int mergeFactor = (Integer) Whitebox.getInternalState(onDiskMerger,
    "mergeFactor");

  // make sure the io.sort.factor is set properly
  assertEquals(mergeFactor, SORT_FACTOR);

  // Stop the onDiskMerger thread so that we can intercept the list of files
  // waiting to be merged.
  onDiskMerger.suspend();

  //Send the list of fake files waiting to be merged
  Random rand = new Random();
  for(int i = 0; i < 2*SORT_FACTOR; ++i) {
    Path path = new Path("somePath");
    CompressAwarePath cap = new CompressAwarePath(path, 1l, rand.nextInt());
    manager.closeOnDiskFile(cap);
  }

  //Check that the files pending to be merged are in sorted order.
  LinkedList<List<CompressAwarePath>> pendingToBeMerged =
    (LinkedList<List<CompressAwarePath>>) Whitebox.getInternalState(
      onDiskMerger, "pendingToBeMerged");
  assertTrue("No inputs were added to list pending to merge",
    pendingToBeMerged.size() > 0);
  for(int i = 0; i < pendingToBeMerged.size(); ++i) {
    List<CompressAwarePath> inputs = pendingToBeMerged.get(i);
    for(int j = 1; j < inputs.size(); ++j) {
      assertTrue("Not enough / too many inputs were going to be merged",
        inputs.size() > 0 && inputs.size() <= SORT_FACTOR);
      assertTrue("Inputs to be merged were not sorted according to size: ",
        inputs.get(j).getCompressedSize()
        >= inputs.get(j-1).getCompressedSize());
    }
  }

}