CommonFileOutputFormat.java 文件源码

protected DataOutputStream getDataOutputStream(final TaskAttemptContext job) throws IOException, InterruptedException {
    final Configuration conf = job.getConfiguration();
    boolean isCompressed = getCompressOutput(job);
    CompressionCodec codec = null;
    String extension = "";
    if (isCompressed) {
        final Class<? extends CompressionCodec> codecClass = getOutputCompressorClass(job, DefaultCodec.class);
        codec = ReflectionUtils.newInstance(codecClass, conf);
        extension = codec.getDefaultExtension();
    }
    final Path file = super.getDefaultWorkFile(job, extension);
    final FileSystem fs = file.getFileSystem(conf);
    if (!isCompressed) {
        return new DataOutputStream(fs.create(file, false));
    } else {
        return new DataOutputStream(codec.createOutputStream(fs.create(file, false)));
    }
}