START OF TRACEBACK
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File: local/lib/python2.7/site-packages/tornado/concurrent.py (Line: 238)
Function: result
  231             before the `Future` is done, so the ``timeout`` is never used.
  232             """
  233             self._clear_tb_log()
  234             if self._result is not None:
  235                 return self._result
  236             if self._exc_info is not None:
  237                 try:
  238 ==>                 raise_exc_info(self._exc_info)
  239                 finally:
  240                     self = None
  241             self._check_done()
  242             return self._result
  243
  244         def exception(self, timeout=None):
Variables:
                self = None
             timeout = None
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File: local/lib/python2.7/site-packages/tornado/gen.py (Line: 910)
Function: error_callback
  903         result = Future()
  904         chain_future(future, result)
  905         if io_loop is None:
  906             io_loop = IOLoop.current()
  907
  908         def error_callback(future):
  909             try:
  910 ==>             future.result()
  911             except Exception as e:
  912                 if not isinstance(e, quiet_exceptions):
  913                     app_log.error("Exception in Future %r after timeout",
  914                                   future, exc_info=True)
  915
  916         def timeout_callback():
Variables:
              future = <tornado.concurrent.Future object at 0x7fce7d9017d0>
                   e = StreamClosedError('Stream is closed',)
    quiet_exceptions = ()
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END OF TRACEBACK