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PYTHON-5671: Use fine-grained locks in the connection pool to reduce contention #2804

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PYTHON-5671: Use fine-grained locks in the connection pool to reduce contention #2804

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0936528
initial lock refactor and race fixes
sophiayangDB May 15, 2026
cce3e48
add self to contributors
sophiayangDB May 15, 2026
e315d82
Merge branch 'master' into PYTHON-5671
sophiayangDB May 15, 2026
8ed0d35
fix unprotected notify
sophiayangDB May 15, 2026
b29d615
indentation fix
sophiayangDB May 15, 2026
598a6ef
remove needs to occur on self.conns
sophiayangDB May 15, 2026
36738bd
changelog
sophiayangDB May 15, 2026
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7 changes: 7 additions & 0 deletions doc/changelog.rst
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@@ -1,6 +1,13 @@
Changelog
=========

Changes in Version 4.18.0 (2026/XX/XX)
--------------------------------------
PyMongo 4.18 brings a number of changes including:

- Improved connection pool throughput under concurrent load by replacing the
single pool lock with fine-grained locks to reduce lock contention.

Changes in Version 4.17.0 (2026/04/20)
--------------------------------------

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1 change: 1 addition & 0 deletions doc/contributors.rst
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Expand Up @@ -108,3 +108,4 @@ The following is a list of people who have contributed to
- Steven Silvester (blink1073)
- Noah Stapp (NoahStapp)
- Cal Jacobson (cj81499)
- Sophia Yang (sophiayangDB)
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@sleepyStick sleepyStick May 15, 2026

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yay!! first pymongo change!!

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