private static int readPidFromFile(String pidFile) throws IOException {
    Scanner scanner = new Scanner(new File(pidFile));
    try {
      return scanner.nextInt();
    } finally {
      scanner.close();
    }
  }
Generates a list of random port numbers in the sorted order. A sorted order makes sense if we
ever want to refer to these servers by their index in the returned array, e.g. server #0, #1,
etc.
hbase-diagnostics/src/test/java/org/apache/hadoop/hbase/util/ProcessBasedLocalHBaseCluster.java