https://github.com/python/cpython/commit/c7d59bd8cfa053e77ae3446c82afff1fd38a4886
commit: c7d59bd8cfa053e77ae3446c82afff1fd38a4886
branch: main
author: Ronald Oussoren <[email protected]>
committer: ronaldoussoren <[email protected]>
date: 2024-01-13T10:48:33+01:00
summary:
gh-101225: Increase the socket backlog when creating a
multiprocessing.connection.Listener (#113567)
Increase the backlog for multiprocessing.connection.Listener` objects created
by `multiprocessing.manager` and `multiprocessing.resource_sharer` to
significantly reduce the risk of getting a connection refused error when
creating
a `multiprocessing.connection.Connection` to them.
files:
A Misc/NEWS.d/next/Library/2023-12-29-17-46-06.gh-issue-101225.QaEyxF.rst
M Lib/multiprocessing/managers.py
M Lib/multiprocessing/resource_sharer.py
diff --git a/Lib/multiprocessing/managers.py b/Lib/multiprocessing/managers.py
index 96cebc6eabec89..76b915de74d94e 100644
--- a/Lib/multiprocessing/managers.py
+++ b/Lib/multiprocessing/managers.py
@@ -156,7 +156,7 @@ def __init__(self, registry, address, authkey, serializer):
Listener, Client = listener_client[serializer]
# do authentication later
- self.listener = Listener(address=address, backlog=16)
+ self.listener = Listener(address=address, backlog=128)
self.address = self.listener.address
self.id_to_obj = {'0': (None, ())}
diff --git a/Lib/multiprocessing/resource_sharer.py
b/Lib/multiprocessing/resource_sharer.py
index 66076509a1202e..b8afb0fbed3a3c 100644
--- a/Lib/multiprocessing/resource_sharer.py
+++ b/Lib/multiprocessing/resource_sharer.py
@@ -123,7 +123,7 @@ def _start(self):
from .connection import Listener
assert self._listener is None, "Already have Listener"
util.debug('starting listener and thread for sending handles')
- self._listener = Listener(authkey=process.current_process().authkey)
+ self._listener = Listener(authkey=process.current_process().authkey,
backlog=128)
self._address = self._listener.address
t = threading.Thread(target=self._serve)
t.daemon = True
diff --git
a/Misc/NEWS.d/next/Library/2023-12-29-17-46-06.gh-issue-101225.QaEyxF.rst
b/Misc/NEWS.d/next/Library/2023-12-29-17-46-06.gh-issue-101225.QaEyxF.rst
new file mode 100644
index 00000000000000..ab3c3a5ef23f45
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-12-29-17-46-06.gh-issue-101225.QaEyxF.rst
@@ -0,0 +1,4 @@
+Increase the backlog for :class:`multiprocessing.connection.Listener` objects
created
+by :mod:`multiprocessing.manager` and :mod:`multiprocessing.resource_sharer` to
+significantly reduce the risk of getting a connection refused error when
creating
+a :class:`multiprocessing.connection.Connection` to them.
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