class_docstr: A stateless implementation of the "Happy Eyeballs" algorithm.
  
  "Happy Eyeballs" is documented in RFC6555 as the recommended practice
  for when both IPv4 and IPv6 addresses are available.
  
  In this implementation, we partition the addresses by family, and
  make the first connection attempt to whichever address was
  returned first by ``getaddrinfo``.  If that connection fails or
  times out, we begin a connection in parallel to the first address
  of the other family.  If there are additional failures we retry
  with other addresses, keeping one connection attempt per family
  in flight at a time.
  
  http://tools.ietf.org/html/rfc6555
code: def clear_timeout(self):
      if self.timeout is not None:
          self.io_loop.remove_timeout(self.timeout)
  
imports: from __future__ import absolute_import, division, print_function
  import functools
  import socket
  from tornado.concurrent import Future
  from tornado.ioloop import IOLoop
  from tornado.iostream import IOStream
  from tornado import gen
  from tornado.netutil import Resolver
  from tornado.platform.auto import set_close_exec
label_desc: Use image node_id 8 for calling the _Connector obj's underlying member method code with example usage: obj.clear_timeout() without return types