code: def exists(self, path):
          
  
          cmd = load_hadoop_cmd() + ['fs', '-stat', path]
          logger.debug('Running file existence check: %s', subprocess.list2cmdline(cmd))
          p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True, universal_newlines=True)
          stdout, stderr = p.communicate()
          if p.returncode == 0:
              return True
          else:
              not_found_pattern = "^.*No such file or directory$"
              not_found_re = re.compile(not_found_pattern)
              for line in stderr.split('\n'):
                  if not_found_re.match(line):
                      return False
              raise hdfs_error.HDFSCliError(cmd, p.returncode, stdout, stderr)
docs: Use ``hadoop fs -stat`` to check file existence.