Exemplo n.º 1
0
  private static IntWritable deduceInputFile(JobConf job) {
    Path[] inputPaths = FileInputFormat.getInputPaths(job);
    Path inputFile = new Path(job.get("map.input.file"));

    // value == one for sort-input; value == two for sort-output
    return (inputFile.getParent().equals(inputPaths[0])) ? sortInput : sortOutput;
  }
Exemplo n.º 2
0
  private static void finalize(
      Configuration conf, JobConf jobconf, final Path destPath, String presevedAttributes)
      throws IOException {
    if (presevedAttributes == null) {
      return;
    }
    EnumSet<FileAttribute> preseved = FileAttribute.parse(presevedAttributes);
    if (!preseved.contains(FileAttribute.USER)
        && !preseved.contains(FileAttribute.GROUP)
        && !preseved.contains(FileAttribute.PERMISSION)) {
      return;
    }

    FileSystem dstfs = destPath.getFileSystem(conf);
    Path dstdirlist = new Path(jobconf.get(DST_DIR_LIST_LABEL));
    SequenceFile.Reader in = null;
    try {
      in = new SequenceFile.Reader(dstdirlist.getFileSystem(jobconf), dstdirlist, jobconf);
      Text dsttext = new Text();
      FilePair pair = new FilePair();
      for (; in.next(dsttext, pair); ) {
        Path absdst = new Path(destPath, pair.output);
        updatePermissions(pair.input, dstfs.getFileStatus(absdst), preseved, dstfs);
      }
    } finally {
      checkAndClose(in);
    }
  }
Exemplo n.º 3
0
 /** Sanity check for srcPath */
 private static void checkSrcPath(Configuration conf, List<Path> srcPaths) throws IOException {
   List<IOException> rslt = new ArrayList<IOException>();
   for (Path p : srcPaths) {
     FileSystem fs = p.getFileSystem(conf);
     if (!fs.exists(p)) {
       rslt.add(new IOException("Input source " + p + " does not exist."));
     }
   }
   if (!rslt.isEmpty()) {
     throw new InvalidInputException(rslt);
   }
 }
Exemplo n.º 4
0
    /**
     * Produce splits such that each is no greater than the quotient of the total size and the
     * number of splits requested.
     *
     * @param job The handle to the JobConf object
     * @param numSplits Number of splits requested
     */
    public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException {
      int cnfiles = job.getInt(SRC_COUNT_LABEL, -1);
      long cbsize = job.getLong(TOTAL_SIZE_LABEL, -1);
      String srcfilelist = job.get(SRC_LIST_LABEL, "");
      if (cnfiles < 0 || cbsize < 0 || "".equals(srcfilelist)) {
        throw new RuntimeException(
            "Invalid metadata: #files("
                + cnfiles
                + ") total_size("
                + cbsize
                + ") listuri("
                + srcfilelist
                + ")");
      }
      Path src = new Path(srcfilelist);
      FileSystem fs = src.getFileSystem(job);
      FileStatus srcst = fs.getFileStatus(src);

      ArrayList<FileSplit> splits = new ArrayList<FileSplit>(numSplits);
      LongWritable key = new LongWritable();
      FilePair value = new FilePair();
      final long targetsize = cbsize / numSplits;
      long pos = 0L;
      long last = 0L;
      long acc = 0L;
      long cbrem = srcst.getLen();
      SequenceFile.Reader sl = null;
      try {
        sl = new SequenceFile.Reader(fs, src, job);
        for (; sl.next(key, value); last = sl.getPosition()) {
          // if adding this split would put this split past the target size,
          // cut the last split and put this next file in the next split.
          if (acc + key.get() > targetsize && acc != 0) {
            long splitsize = last - pos;
            splits.add(new FileSplit(src, pos, splitsize, (String[]) null));
            cbrem -= splitsize;
            pos = last;
            acc = 0L;
          }
          acc += key.get();
        }
      } finally {
        checkAndClose(sl);
      }
      if (cbrem != 0) {
        splits.add(new FileSplit(src, pos, cbrem, (String[]) null));
      }

      return splits.toArray(new FileSplit[splits.size()]);
    }
Exemplo n.º 5
0
  /**
   * Make a path relative with respect to a root path. absPath is always assumed to descend from
   * root. Otherwise returned path is null.
   */
  static String makeRelative(Path root, Path absPath) {
    if (!absPath.isAbsolute()) {
      throw new IllegalArgumentException("!absPath.isAbsolute(), absPath=" + absPath);
    }
    String p = absPath.toUri().getPath();

    StringTokenizer pathTokens = new StringTokenizer(p, "/");
    for (StringTokenizer rootTokens = new StringTokenizer(root.toUri().getPath(), "/");
        rootTokens.hasMoreTokens(); ) {
      if (!rootTokens.nextToken().equals(pathTokens.nextToken())) {
        return null;
      }
    }
    StringBuilder sb = new StringBuilder();
    for (; pathTokens.hasMoreTokens(); ) {
      sb.append(pathTokens.nextToken());
      if (pathTokens.hasMoreTokens()) {
        sb.append(Path.SEPARATOR);
      }
    }
    return sb.length() == 0 ? "." : sb.toString();
  }
Exemplo n.º 6
0
 private static List<Path> fetchFileList(Configuration conf, Path srcList) throws IOException {
   List<Path> result = new ArrayList<Path>();
   FileSystem fs = srcList.getFileSystem(conf);
   BufferedReader input = null;
   try {
     input = new BufferedReader(new InputStreamReader(fs.open(srcList)));
     String line = input.readLine();
     while (line != null) {
       result.add(new Path(line));
       line = input.readLine();
     }
   } finally {
     checkAndClose(input);
   }
   return result;
 }
Exemplo n.º 7
0
 /**
  * Mapper configuration. Extracts source and destination file system, as well as top-level paths
  * on source and destination directories. Gets the named file systems, to be used later in map.
  */
 public void configure(JobConf job) {
   destPath = new Path(job.get(DST_DIR_LABEL, "/"));
   try {
     destFileSys = destPath.getFileSystem(job);
   } catch (IOException ex) {
     throw new RuntimeException("Unable to get the named file system.", ex);
   }
   sizeBuf = job.getInt("copy.buf.size", 128 * 1024);
   buffer = new byte[sizeBuf];
   ignoreReadFailures = job.getBoolean(Options.IGNORE_READ_FAILURES.propertyname, false);
   preserve_status = job.getBoolean(Options.PRESERVE_STATUS.propertyname, false);
   if (preserve_status) {
     preseved = FileAttribute.parse(job.get(PRESERVE_STATUS_LABEL));
   }
   update = job.getBoolean(Options.UPDATE.propertyname, false);
   overwrite = !update && job.getBoolean(Options.OVERWRITE.propertyname, false);
   this.job = job;
 }
Exemplo n.º 8
0
  public static void main(String[] args) {
    int testType = TEST_TYPE_READ;
    int bufferSize = DEFAULT_BUFFER_SIZE;
    int fileSize = 1;
    int nrFiles = 1;
    String resFileName = DEFAULT_RES_FILE_NAME;
    boolean isSequential = false;

    String version = "DFSCIOTest.0.0.1";
    String usage =
        "Usage: DFSCIOTest -read | -write | -clean [-nrFiles N] [-fileSize MB] [-resFile resultFileName] [-bufferSize Bytes] ";

    System.out.println(version);
    if (args.length == 0) {
      System.err.println(usage);
      System.exit(-1);
    }
    for (int i = 0; i < args.length; i++) { // parse command line
      if (args[i].startsWith("-r")) {
        testType = TEST_TYPE_READ;
      } else if (args[i].startsWith("-w")) {
        testType = TEST_TYPE_WRITE;
      } else if (args[i].startsWith("-clean")) {
        testType = TEST_TYPE_CLEANUP;
      } else if (args[i].startsWith("-seq")) {
        isSequential = true;
      } else if (args[i].equals("-nrFiles")) {
        nrFiles = Integer.parseInt(args[++i]);
      } else if (args[i].equals("-fileSize")) {
        fileSize = Integer.parseInt(args[++i]);
      } else if (args[i].equals("-bufferSize")) {
        bufferSize = Integer.parseInt(args[++i]);
      } else if (args[i].equals("-resFile")) {
        resFileName = args[++i];
      }
    }

    LOG.info("nrFiles = " + nrFiles);
    LOG.info("fileSize (MB) = " + fileSize);
    LOG.info("bufferSize = " + bufferSize);

    try {
      fsConfig.setInt("test.io.file.buffer.size", bufferSize);
      FileSystem fs = FileSystem.get(fsConfig);

      if (testType != TEST_TYPE_CLEANUP) {
        fs.delete(HDFS_TEST_DIR, true);
        if (!fs.mkdirs(HDFS_TEST_DIR)) {
          throw new IOException("Mkdirs failed to create " + HDFS_TEST_DIR.toString());
        }

        // Copy the executables over to the remote filesystem
        String hadoopHome = System.getenv("HADOOP_PREFIX");
        fs.copyFromLocalFile(
            new Path(hadoopHome + "/libhdfs/libhdfs.so." + HDFS_LIB_VERSION), HDFS_SHLIB);
        fs.copyFromLocalFile(new Path(hadoopHome + "/libhdfs/hdfs_read"), HDFS_READ);
        fs.copyFromLocalFile(new Path(hadoopHome + "/libhdfs/hdfs_write"), HDFS_WRITE);
      }

      if (isSequential) {
        long tStart = System.currentTimeMillis();
        sequentialTest(fs, testType, fileSize, nrFiles);
        long execTime = System.currentTimeMillis() - tStart;
        String resultLine = "Seq Test exec time sec: " + (float) execTime / 1000;
        LOG.info(resultLine);
        return;
      }
      if (testType == TEST_TYPE_CLEANUP) {
        cleanup(fs);
        return;
      }
      createControlFile(fs, fileSize, nrFiles);
      long tStart = System.currentTimeMillis();
      if (testType == TEST_TYPE_WRITE) writeTest(fs);
      if (testType == TEST_TYPE_READ) readTest(fs);
      long execTime = System.currentTimeMillis() - tStart;

      analyzeResult(fs, testType, execTime, resFileName);
    } catch (Exception e) {
      System.err.print(e.getLocalizedMessage());
      System.exit(-1);
    }
  }
Exemplo n.º 9
0
    public Long doIO(Reporter reporter, String name, long totalSize) throws IOException {
      totalSize *= MEGA;

      // create instance of local filesystem
      FileSystem localFS = FileSystem.getLocal(fsConfig);

      try {
        // native runtime
        Runtime runTime = Runtime.getRuntime();

        // copy the dso and executable from dfs
        synchronized (this) {
          localFS.delete(HDFS_TEST_DIR, true);
          if (!(localFS.mkdirs(HDFS_TEST_DIR))) {
            throw new IOException("Failed to create " + HDFS_TEST_DIR + " on local filesystem");
          }
        }

        synchronized (this) {
          if (!localFS.exists(HDFS_SHLIB)) {
            if (!FileUtil.copy(fs, HDFS_SHLIB, localFS, HDFS_SHLIB, false, fsConfig)) {
              throw new IOException("Failed to copy " + HDFS_SHLIB + " to local filesystem");
            }

            String chmodCmd = new String(CHMOD + " a+x " + HDFS_SHLIB);
            Process process = runTime.exec(chmodCmd);
            int exitStatus = process.waitFor();
            if (exitStatus != 0) {
              throw new IOException(chmodCmd + ": Failed with exitStatus: " + exitStatus);
            }
          }
        }

        synchronized (this) {
          if (!localFS.exists(HDFS_READ)) {
            if (!FileUtil.copy(fs, HDFS_READ, localFS, HDFS_READ, false, fsConfig)) {
              throw new IOException("Failed to copy " + HDFS_READ + " to local filesystem");
            }

            String chmodCmd = new String(CHMOD + " a+x " + HDFS_READ);
            Process process = runTime.exec(chmodCmd);
            int exitStatus = process.waitFor();

            if (exitStatus != 0) {
              throw new IOException(chmodCmd + ": Failed with exitStatus: " + exitStatus);
            }
          }
        }

        // exec the C program
        Path inFile = new Path(DATA_DIR, name);
        String readCmd = new String(HDFS_READ + " " + inFile + " " + totalSize + " " + bufferSize);
        Process process = runTime.exec(readCmd, null, new File(HDFS_TEST_DIR.toString()));
        int exitStatus = process.waitFor();

        if (exitStatus != 0) {
          throw new IOException(HDFS_READ + ": Failed with exitStatus: " + exitStatus);
        }
      } catch (InterruptedException interruptedException) {
        reporter.setStatus(interruptedException.toString());
      } finally {
        localFS.close();
      }
      return new Long(totalSize);
    }
Exemplo n.º 10
0
  /**
   * Initialize DFSCopyFileMapper specific job-configuration.
   *
   * @param conf : The dfs/mapred configuration.
   * @param jobConf : The handle to the jobConf object to be initialized.
   * @param args Arguments
   */
  private static void setup(Configuration conf, JobConf jobConf, final Arguments args)
      throws IOException {
    jobConf.set(DST_DIR_LABEL, args.dst.toUri().toString());

    // set boolean values
    final boolean update = args.flags.contains(Options.UPDATE);
    final boolean overwrite = !update && args.flags.contains(Options.OVERWRITE);
    jobConf.setBoolean(Options.UPDATE.propertyname, update);
    jobConf.setBoolean(Options.OVERWRITE.propertyname, overwrite);
    jobConf.setBoolean(
        Options.IGNORE_READ_FAILURES.propertyname,
        args.flags.contains(Options.IGNORE_READ_FAILURES));
    jobConf.setBoolean(
        Options.PRESERVE_STATUS.propertyname, args.flags.contains(Options.PRESERVE_STATUS));

    final String randomId = getRandomId();
    JobClient jClient = new JobClient(jobConf);
    Path jobDirectory = new Path(jClient.getSystemDir(), NAME + "_" + randomId);
    jobConf.set(JOB_DIR_LABEL, jobDirectory.toString());

    FileSystem dstfs = args.dst.getFileSystem(conf);
    boolean dstExists = dstfs.exists(args.dst);
    boolean dstIsDir = false;
    if (dstExists) {
      dstIsDir = dstfs.getFileStatus(args.dst).isDir();
    }

    // default logPath
    Path logPath = args.log;
    if (logPath == null) {
      String filename = "_distcp_logs_" + randomId;
      if (!dstExists || !dstIsDir) {
        Path parent = args.dst.getParent();
        if (!dstfs.exists(parent)) {
          dstfs.mkdirs(parent);
        }
        logPath = new Path(parent, filename);
      } else {
        logPath = new Path(args.dst, filename);
      }
    }
    FileOutputFormat.setOutputPath(jobConf, logPath);

    // create src list, dst list
    FileSystem jobfs = jobDirectory.getFileSystem(jobConf);

    Path srcfilelist = new Path(jobDirectory, "_distcp_src_files");
    jobConf.set(SRC_LIST_LABEL, srcfilelist.toString());
    SequenceFile.Writer src_writer =
        SequenceFile.createWriter(
            jobfs,
            jobConf,
            srcfilelist,
            LongWritable.class,
            FilePair.class,
            SequenceFile.CompressionType.NONE);

    Path dstfilelist = new Path(jobDirectory, "_distcp_dst_files");
    SequenceFile.Writer dst_writer =
        SequenceFile.createWriter(
            jobfs, jobConf, dstfilelist, Text.class, Text.class, SequenceFile.CompressionType.NONE);

    Path dstdirlist = new Path(jobDirectory, "_distcp_dst_dirs");
    jobConf.set(DST_DIR_LIST_LABEL, dstdirlist.toString());
    SequenceFile.Writer dir_writer =
        SequenceFile.createWriter(
            jobfs,
            jobConf,
            dstdirlist,
            Text.class,
            FilePair.class,
            SequenceFile.CompressionType.NONE);

    // handle the case where the destination directory doesn't exist
    // and we've only a single src directory OR we're updating/overwriting
    // the contents of the destination directory.
    final boolean special = (args.srcs.size() == 1 && !dstExists) || update || overwrite;
    int srcCount = 0, cnsyncf = 0, dirsyn = 0;
    long fileCount = 0L, byteCount = 0L, cbsyncs = 0L;
    try {
      for (Iterator<Path> srcItr = args.srcs.iterator(); srcItr.hasNext(); ) {
        final Path src = srcItr.next();
        FileSystem srcfs = src.getFileSystem(conf);
        FileStatus srcfilestat = srcfs.getFileStatus(src);
        Path root = special && srcfilestat.isDir() ? src : src.getParent();
        if (srcfilestat.isDir()) {
          ++srcCount;
        }

        Stack<FileStatus> pathstack = new Stack<FileStatus>();
        for (pathstack.push(srcfilestat); !pathstack.empty(); ) {
          FileStatus cur = pathstack.pop();
          FileStatus[] children = srcfs.listStatus(cur.getPath());
          for (int i = 0; i < children.length; i++) {
            boolean skipfile = false;
            final FileStatus child = children[i];
            final String dst = makeRelative(root, child.getPath());
            ++srcCount;

            if (child.isDir()) {
              pathstack.push(child);
            } else {
              // skip file if the src and the dst files are the same.
              skipfile = update && sameFile(srcfs, child, dstfs, new Path(args.dst, dst));
              // skip file if it exceed file limit or size limit
              skipfile |=
                  fileCount == args.filelimit || byteCount + child.getLen() > args.sizelimit;

              if (!skipfile) {
                ++fileCount;
                byteCount += child.getLen();

                if (LOG.isTraceEnabled()) {
                  LOG.trace("adding file " + child.getPath());
                }

                ++cnsyncf;
                cbsyncs += child.getLen();
                if (cnsyncf > SYNC_FILE_MAX || cbsyncs > BYTES_PER_MAP) {
                  src_writer.sync();
                  dst_writer.sync();
                  cnsyncf = 0;
                  cbsyncs = 0L;
                }
              }
            }

            if (!skipfile) {
              src_writer.append(
                  new LongWritable(child.isDir() ? 0 : child.getLen()), new FilePair(child, dst));
            }

            dst_writer.append(new Text(dst), new Text(child.getPath().toString()));
          }

          if (cur.isDir()) {
            String dst = makeRelative(root, cur.getPath());
            dir_writer.append(new Text(dst), new FilePair(cur, dst));
            if (++dirsyn > SYNC_FILE_MAX) {
              dirsyn = 0;
              dir_writer.sync();
            }
          }
        }
      }
    } finally {
      checkAndClose(src_writer);
      checkAndClose(dst_writer);
      checkAndClose(dir_writer);
    }

    FileStatus dststatus = null;
    try {
      dststatus = dstfs.getFileStatus(args.dst);
    } catch (FileNotFoundException fnfe) {
      LOG.info(args.dst + " does not exist.");
    }

    // create dest path dir if copying > 1 file
    if (dststatus == null) {
      if (srcCount > 1 && !dstfs.mkdirs(args.dst)) {
        throw new IOException("Failed to create" + args.dst);
      }
    }

    final Path sorted = new Path(jobDirectory, "_distcp_sorted");
    checkDuplication(jobfs, dstfilelist, sorted, conf);

    if (dststatus != null && args.flags.contains(Options.DELETE)) {
      deleteNonexisting(dstfs, dststatus, sorted, jobfs, jobDirectory, jobConf, conf);
    }

    Path tmpDir =
        new Path(
            (dstExists && !dstIsDir) || (!dstExists && srcCount == 1)
                ? args.dst.getParent()
                : args.dst,
            "_distcp_tmp_" + randomId);
    jobConf.set(TMP_DIR_LABEL, tmpDir.toUri().toString());
    LOG.info("srcCount=" + srcCount);
    jobConf.setInt(SRC_COUNT_LABEL, srcCount);
    jobConf.setLong(TOTAL_SIZE_LABEL, byteCount);
    setMapCount(byteCount, jobConf);
  }
Exemplo n.º 11
0
 /** Fully delete dir */
 static void fullyDelete(String dir, Configuration conf) throws IOException {
   if (dir != null) {
     Path tmp = new Path(dir);
     tmp.getFileSystem(conf).delete(tmp, true);
   }
 }
Exemplo n.º 12
0
    /**
     * Copy a file to a destination.
     *
     * @param srcstat src path and metadata
     * @param dstpath dst path
     * @param reporter
     */
    private void copy(
        FileStatus srcstat,
        Path relativedst,
        OutputCollector<WritableComparable<?>, Text> outc,
        Reporter reporter)
        throws IOException {
      Path absdst = new Path(destPath, relativedst);
      int totfiles = job.getInt(SRC_COUNT_LABEL, -1);
      assert totfiles >= 0 : "Invalid file count " + totfiles;

      // if a directory, ensure created even if empty
      if (srcstat.isDir()) {
        if (destFileSys.exists(absdst)) {
          if (!destFileSys.getFileStatus(absdst).isDir()) {
            throw new IOException("Failed to mkdirs: " + absdst + " is a file.");
          }
        } else if (!destFileSys.mkdirs(absdst)) {
          throw new IOException("Failed to mkdirs " + absdst);
        }
        // TODO: when modification times can be set, directories should be
        // emitted to reducers so they might be preserved. Also, mkdirs does
        // not currently return an error when the directory already exists;
        // if this changes, all directory work might as well be done in reduce
        return;
      }

      if (destFileSys.exists(absdst) && !overwrite && !needsUpdate(srcstat, destFileSys, absdst)) {
        outc.collect(null, new Text("SKIP: " + srcstat.getPath()));
        ++skipcount;
        reporter.incrCounter(Counter.SKIP, 1);
        updateStatus(reporter);
        return;
      }

      Path tmpfile = new Path(job.get(TMP_DIR_LABEL), relativedst);
      long cbcopied = 0L;
      FSDataInputStream in = null;
      FSDataOutputStream out = null;
      try {
        // open src file
        try {
          in = srcstat.getPath().getFileSystem(job).open(srcstat.getPath());
        } catch (IOException e) {
          LOG.error("Failed to open src file " + srcstat.getPath() + ", ignore and return");
          in = null;
          return;
        }
        reporter.incrCounter(Counter.BYTESEXPECTED, srcstat.getLen());
        // open tmp file
        out = create(tmpfile, reporter, srcstat);
        // copy file
        for (int cbread; (cbread = in.read(buffer)) >= 0; ) {
          out.write(buffer, 0, cbread);
          cbcopied += cbread;
          reporter.setStatus(
              String.format("%.2f ", cbcopied * 100.0 / srcstat.getLen())
                  + absdst
                  + " [ "
                  + StringUtils.humanReadableInt(cbcopied)
                  + " / "
                  + StringUtils.humanReadableInt(srcstat.getLen())
                  + " ]");
        }
      } finally {
        checkAndClose(in);
        checkAndClose(out);
      }

      if (cbcopied != srcstat.getLen()) {
        if (srcstat.getLen() == 0 && cbcopied > 0) {
          LOG.info("most likely see a WAL file corruption: " + srcstat.getPath());
        } else {
          throw new IOException(
              "File size not matched: copied "
                  + bytesString(cbcopied)
                  + " to tmpfile (="
                  + tmpfile
                  + ") but expected "
                  + bytesString(srcstat.getLen())
                  + " from "
                  + srcstat.getPath());
        }
      } else {
        if (totfiles == 1) {
          // Copying a single file; use dst path provided by user as destination
          // rather than destination directory, if a file
          Path dstparent = absdst.getParent();
          if (!(destFileSys.exists(dstparent) && destFileSys.getFileStatus(dstparent).isDir())) {
            absdst = dstparent;
          }
        }
        if (destFileSys.exists(absdst) && destFileSys.getFileStatus(absdst).isDir()) {
          throw new IOException(absdst + " is a directory");
        }
        if (!destFileSys.mkdirs(absdst.getParent())) {
          throw new IOException("Failed to craete parent dir: " + absdst.getParent());
        }
        rename(tmpfile, absdst);

        FileStatus dststat = destFileSys.getFileStatus(absdst);
        if (dststat.getLen() != srcstat.getLen()) {
          destFileSys.delete(absdst, false);
          throw new IOException(
              "File size not matched: copied "
                  + bytesString(dststat.getLen())
                  + " to dst (="
                  + absdst
                  + ") but expected "
                  + bytesString(srcstat.getLen())
                  + " from "
                  + srcstat.getPath());
        }
        updatePermissions(srcstat, dststat);
      }

      // report at least once for each file
      ++copycount;
      reporter.incrCounter(Counter.BYTESCOPIED, cbcopied);
      reporter.incrCounter(Counter.COPY, 1);
      updateStatus(reporter);
    }
Exemplo n.º 13
0
 public boolean accept(Path path) {
   return (path.getName().startsWith("part-"));
 }
Exemplo n.º 14
0
    static void checkRecords(Configuration defaults, Path sortInput, Path sortOutput)
        throws IOException {
      FileSystem inputfs = sortInput.getFileSystem(defaults);
      FileSystem outputfs = sortOutput.getFileSystem(defaults);
      FileSystem defaultfs = FileSystem.get(defaults);
      JobConf jobConf = new JobConf(defaults, RecordStatsChecker.class);
      jobConf.setJobName("sortvalidate-recordstats-checker");

      int noSortReduceTasks = outputfs.listStatus(sortOutput, sortPathsFilter).length;
      jobConf.setInt("sortvalidate.sort.reduce.tasks", noSortReduceTasks);
      int noSortInputpaths = inputfs.listStatus(sortInput).length;

      jobConf.setInputFormat(NonSplitableSequenceFileInputFormat.class);
      jobConf.setOutputFormat(SequenceFileOutputFormat.class);

      jobConf.setOutputKeyClass(IntWritable.class);
      jobConf.setOutputValueClass(RecordStatsChecker.RecordStatsWritable.class);

      jobConf.setMapperClass(Map.class);
      jobConf.setCombinerClass(Reduce.class);
      jobConf.setReducerClass(Reduce.class);

      jobConf.setNumMapTasks(noSortReduceTasks);
      jobConf.setNumReduceTasks(1);

      FileInputFormat.setInputPaths(jobConf, sortInput);
      FileInputFormat.addInputPath(jobConf, sortOutput);
      Path outputPath = new Path("/tmp/sortvalidate/recordstatschecker");
      if (defaultfs.exists(outputPath)) {
        defaultfs.delete(outputPath, true);
      }
      FileOutputFormat.setOutputPath(jobConf, outputPath);

      // Uncomment to run locally in a single process
      // job_conf.set("mapred.job.tracker", "local");
      Path[] inputPaths = FileInputFormat.getInputPaths(jobConf);
      System.out.println(
          "\nSortValidator.RecordStatsChecker: Validate sort "
              + "from "
              + inputPaths[0]
              + " ("
              + noSortInputpaths
              + " files), "
              + inputPaths[1]
              + " ("
              + noSortReduceTasks
              + " files) into "
              + FileOutputFormat.getOutputPath(jobConf)
              + " with 1 reducer.");
      Date startTime = new Date();
      System.out.println("Job started: " + startTime);
      JobClient.runJob(jobConf);
      Date end_time = new Date();
      System.out.println("Job ended: " + end_time);
      System.out.println(
          "The job took " + (end_time.getTime() - startTime.getTime()) / 1000 + " seconds.");

      // Check to ensure that the statistics of the
      // framework's sort-input and sort-output match
      SequenceFile.Reader stats =
          new SequenceFile.Reader(defaultfs, new Path(outputPath, "part-00000"), defaults);
      IntWritable k1 = new IntWritable();
      IntWritable k2 = new IntWritable();
      RecordStatsWritable v1 = new RecordStatsWritable();
      RecordStatsWritable v2 = new RecordStatsWritable();
      if (!stats.next(k1, v1)) {
        throw new IOException("Failed to read record #1 from reduce's output");
      }
      if (!stats.next(k2, v2)) {
        throw new IOException("Failed to read record #2 from reduce's output");
      }

      if ((v1.getBytes() != v2.getBytes())
          || (v1.getRecords() != v2.getRecords())
          || v1.getChecksum() != v2.getChecksum()) {
        throw new IOException(
            "("
                + v1.getBytes()
                + ", "
                + v1.getRecords()
                + ", "
                + v1.getChecksum()
                + ") v/s ("
                + v2.getBytes()
                + ", "
                + v2.getRecords()
                + ", "
                + v2.getChecksum()
                + ")");
      }
    }