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[3.12] gh-112169: Documented getaddrinfo/getnameinfo default loop executor usage and implications. (GH-112191) (#120936)

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gh-112169: Documented getaddrinfo/getnameinfo default loop executor usage and implications. (GH-112191)
(cherry picked from commit fc297b4ba4)

Co-authored-by: Alek Kowalczyk <alek.kowalczyk@gmail.com>
Co-authored-by: Guido van Rossum <gvanrossum@gmail.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
Co-authored-by: Carol Willing <carolcode@willingconsulting.com>
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Doc/library/asyncio-eventloop.rst
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@ -1139,6 +1139,14 @@ DNS
Asynchronous version of :meth:`socket.getnameinfo`. Asynchronous version of :meth:`socket.getnameinfo`.
.. note::
Both *getaddrinfo* and *getnameinfo* internally utilize their synchronous
versions through the loop's default thread pool executor.
When this executor is saturated, these methods may experience delays,
which higher-level networking libraries may report as increased timeouts.
To mitigate this, consider using a custom executor for other user tasks,
or setting a default executor with a larger number of workers.
.. versionchanged:: 3.7 .. versionchanged:: 3.7
Both *getaddrinfo* and *getnameinfo* methods were always documented Both *getaddrinfo* and *getnameinfo* methods were always documented
to return a coroutine, but prior to Python 3.7 they were, in fact, to return a coroutine, but prior to Python 3.7 they were, in fact,