TestTotalOrderPartitioner.java 文件源码

private static <T extends WritableComparable<?>> Path writePartitionFile(
    String testname, Configuration conf, T[] splits) throws IOException {
  final FileSystem fs = FileSystem.getLocal(conf);
  final Path testdir = new Path(System.getProperty("test.build.data", "/tmp")
                               ).makeQualified(fs);
  Path p = new Path(testdir, testname + "/_partition.lst");
  TotalOrderPartitioner.setPartitionFile(conf, p);
  conf.setInt(MRJobConfig.NUM_REDUCES, splits.length + 1);
  SequenceFile.Writer w = null;
  try {
    w = SequenceFile.createWriter(fs, conf, p,
        splits[0].getClass(), NullWritable.class,
        SequenceFile.CompressionType.NONE);
    for (int i = 0; i < splits.length; ++i) {
      w.append(splits[i], NullWritable.get());
    }
  } finally {
    if (null != w)
      w.close();
  }
  return p;
}