when use aiodns

[yangbo1024]

never use aiodns,why?

in resolver.py

from .abc import AbstractResolver


__all__ = ('ThreadedResolver', 'AsyncResolver', 'DefaultResolver')

try:
    import aiodns
    # aiodns_default = hasattr(aiodns.DNSResolver, 'gethostbyname')
except ImportError:  # pragma: no cover
    aiodns = None

aiodns_default = False
# ...

DefaultResolver = AsyncResolver if aiodns_default else ThreadedResolver

[asvetlov]

Because aiodns is not dropin replacement for standard DNS API.
It works in 99% of cases but sometimes demonstrate different behavior in very rare conditions (#2237, #559)

[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