server often throw "concurrent.futures._base.CancelledError"

[larryclean]

Long story short

i use aioredis to update data often throw "concurrent.futures._base.CancelledError" at aiohttp socket.io.
so my data can't update.

Expected behaviour

i expect can update redis data

Actual behaviour

    @sio.on('disconnect')
    async def disconnect(sid):
        """
        链接断开连接
        :param sid:
        :return:
        """
        await factory.leave_room(sid)
        rooms = sio.rooms(sid)
        for room in rooms:
            sio.leave_room(sid, room)
        await sio.eio.disconnect(sid)

Steps to reproduce

There is no recurrence method,but our production environment has this error

Your environment

centos
aiohttp 2.2.3
aioredis 0.3.3
python-socketio 1.8.0

[asvetlov]

See #2098 for behavior explanation

[bluemix]

I was having two consecutive requests to the server, and I was having

...
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/base_events.py", line 467, in run_until_complete
    return future.result()
concurrent.futures._base.CancelledError

so, I just placed await asyncio.sleep(0.1) between the requests and the above error is gone and everything worked correctly.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new