From 6324b135acb92042017c2364540c37426b0ea65f Mon Sep 17 00:00:00 2001 From: Vinay Sajip Date: Mon, 29 Aug 2022 22:29:22 +0100 Subject: gh-91305: Add a note about DatagramHandler and DNS latency. (GH-96380) --- Doc/library/logging.handlers.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Doc/library/logging.handlers.rst b/Doc/library/logging.handlers.rst index f125dfe..a012927 100644 --- a/Doc/library/logging.handlers.rst +++ b/Doc/library/logging.handlers.rst @@ -572,6 +572,13 @@ over UDP sockets. Returns a new instance of the :class:`DatagramHandler` class intended to communicate with a remote machine whose address is given by *host* and *port*. + .. note:: As UDP is not a streaming protocol, there is no persistent connection + between an instance of this handler and *host*. For this reason, when using a + network socket, a DNS lookup might have to be made each time an event is + logged, which can introduce some latency into the system. If this affects you, + you can do a lookup yourself and initialize this handler using the looked-up IP + address rather than the hostname. + .. versionchanged:: 3.4 If ``port`` is specified as ``None``, a Unix domain socket is created using the value in ``host`` - otherwise, a UDP socket is created. -- cgit v0.12