Asyncio RuntimeError: Event Loop is Closed

Question

I\'m trying to make a bunch of requests (~1000) using Asyncio and the aiohttp library, but I am running into a problem that I can\'t find much info on.

When I run th

Answer 1

The bug is filed as https://github.com/python/asyncio/issues/258 Stay tuned.

As quick workaround I suggest using custom executor, e.g.

loop = asyncio.get_event_loop()
executor = concurrent.futures.ThreadPoolExecutor(5)
loop.set_default_executor(executor)

Before finishing your program please do

executor.shutdown(wait=True)
loop.close()

Answer 2

You're right, loop.getaddrinfo uses a ThreadPoolExecutor to run socket.getaddrinfo in a thread.

You're using asyncio.wait_for with a timeout, which means res = yield from asyncio.wait_for... will raise a asyncio.TimeoutError after 4 seconds. Then the get_status coroutines return None and the loop stops. If a job finishes after that, it will try to schedule a callback in the event loop and raises an exception since it is already closed.