DRIVERS-3218 Avoid clearing the connection pool when the server connection rate limiter triggers by blink1073 · Pull Request #1855 · mongodb/specifications

blink1073 · 2025-11-11T15:44:50Z

Replaces #1852

Please complete the following before merging:

Is the relevant DRIVERS ticket in the PR title?

Update changelog.
Test changes in at least one language driver. PYTHON-5517 Simplify pool backpressure behavior mongo-python-driver#2611
Test these changes against all server versions and topologies (including standalone, replica set, and sharded
clusters).

…ction rate limiter triggers

blink1073 · 2025-11-11T15:48:06Z

source/connection-monitoring-and-pooling/tests/cmap-format/pool-create-min-size-error.yml

While we are discouraged from changing existing tests, these test still pass without the backpressure changes, and this avoids adding a new runOnRequirement.

https://spruce.mongodb.com/version/6914e629b2e3e30007b7c384/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

source/connection-monitoring-and-pooling/connection-monitoring-and-pooling.md

source/server-discovery-and-monitoring/server-discovery-and-monitoring.md

source/server-discovery-and-monitoring/tests/unified/backpressure-network-error-fail.yml

baileympearson

One minor comment.

Second implementation in Node is passing: https://spruce.mongodb.com/version/691f7e221be6180007ecf081/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

source/connection-monitoring-and-pooling/connection-monitoring-and-pooling.md

baileympearson · 2025-11-21T17:00:31Z

source/connection-monitoring-and-pooling/connection-monitoring-and-pooling.md

changelog dates?

blink1073 · 2025-11-21T18:15:18Z

source/server-discovery-and-monitoring/server-monitoring.md

 many clients start at once. A client's subsequent scans of the mongoses are always in the same order, since their
 lastUpdateTimes are always in the same order by the time a scan ends.

+##### Handling of backpressure labels


@kevinAlbs We added this section specifically for the C Driver. Does this make sense?

kevinAlbs · 2025-11-25T13:20:22Z

source/server-discovery-and-monitoring/server-monitoring.md

Suggest removing this Note:. This is in the "Monitor thread" section. The C driver single-threaded client does not implement the "Streaming Protocol" (only polling). I think the new "Handling of backpressure labels" is enough.

Great, thank you!

I've pinged you for one more approval for this change

…RS-3218-2

kevinAlbs

Additions to server-monitoring.md LGTM with a typo fix.

source/server-discovery-and-monitoring/server-monitoring.md

Co-authored-by: Kevin Albertson <kevin.eric.albertson@gmail.com>

DRIVERS-3218 Avoid clearing the connection pool when the server conne…

5ad9007

…ction rate limiter triggers

blink1073 requested review from a team as code owners November 11, 2025 15:44

blink1073 requested review from BorisDog and ShaneHarvey and removed request for a team November 11, 2025 15:44

blink1073 mentioned this pull request Nov 11, 2025

DRIVERS-3218 Avoid clearing the connection pool when the server connection rate limiter triggers #1852

Closed

4 tasks

blink1073 commented Nov 11, 2025

View reviewed changes

blink1073 added 4 commits November 11, 2025 09:51

capitalization

5536501

address tech review

199c4d7

bump schema versions

aa08fe9

bump schema versions

7d32469

BorisDog requested review from papafe and removed request for papafe November 12, 2025 17:34

update tests

4d318fa

ShaneHarvey reviewed Nov 12, 2025

View reviewed changes

source/connection-monitoring-and-pooling/connection-monitoring-and-pooling.md Outdated Show resolved Hide resolved

source/server-discovery-and-monitoring/server-discovery-and-monitoring.md Show resolved Hide resolved

address review

2c87677

nhachicha reviewed Nov 14, 2025

View reviewed changes

source/server-discovery-and-monitoring/tests/unified/backpressure-network-error-fail.yml Show resolved Hide resolved

blink1073 added 3 commits November 14, 2025 15:48

Add connection pool prose tests

f46d39c

Add test for backpressure error label on command error

a14cacc

update sdam test

fdcacbd

blink1073 requested a review from a team as a code owner November 17, 2025 15:55

blink1073 requested review from JamesKovacs and removed request for a team November 17, 2025 15:55

blink1073 added 5 commits November 17, 2025 10:16

udpate schema version

53a7fdf

cleanup

2a287dc

fix test

c8d1a33

formatting

f4106e8

replace tests

bdde73f

blink1073 added 4 commits November 20, 2025 09:38

run mdformat

9dedf63

clean up prose test

b70d360

update the min pool size test

00e54b0

bump schema versions

6bd9f70

blink1073 requested a review from baileympearson November 20, 2025 21:41

baileympearson requested changes Nov 20, 2025

View reviewed changes

source/connection-monitoring-and-pooling/connection-monitoring-and-pooling.md Show resolved Hide resolved

ShaneHarvey reviewed Nov 20, 2025

View reviewed changes

source/connection-monitoring-and-pooling/connection-monitoring-and-pooling.md Outdated Show resolved Hide resolved

address review

9b9c4af

blink1073 requested review from ShaneHarvey and baileympearson November 21, 2025 16:39

baileympearson requested changes Nov 21, 2025

View reviewed changes

add changelog dates

da3885a

blink1073 requested a review from baileympearson November 21, 2025 17:34

baileympearson approved these changes Nov 21, 2025

View reviewed changes

ShaneHarvey approved these changes Nov 21, 2025

View reviewed changes

fix Single-threaded monitor section

7464e61

blink1073 commented Nov 21, 2025

View reviewed changes

kevinAlbs reviewed Nov 25, 2025

View reviewed changes

address review

eeac077

blink1073 requested a review from kevinAlbs November 25, 2025 13:48

blink1073 added 2 commits November 25, 2025 07:53

Merge branch 'master' of github.com:mongodb/specifications into DRIVE…

fa9633b

…RS-3218-2

lint

7205ef0

kevinAlbs approved these changes Nov 25, 2025

View reviewed changes

source/server-discovery-and-monitoring/server-monitoring.md Outdated Show resolved Hide resolved

Update source/server-discovery-and-monitoring/server-monitoring.md

21eff0f

Co-authored-by: Kevin Albertson <kevin.eric.albertson@gmail.com>

blink1073 requested a review from Jibola November 25, 2025 17:58

Jibola approved these changes Nov 26, 2025

View reviewed changes

Jibola merged commit 1cafc53 into mongodb:master Nov 26, 2025
6 checks passed

This was referenced Nov 26, 2025

DRIVERS-3218: update SDAM error handling tests to ignore handshake failures #1860

Merged

feat(NODE-7121): prevent connection churn on backpressure errors when establishing connections mongodb/node-mongodb-native#4800

Merged

Conversation

blink1073 commented Nov 11, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

blink1073 Nov 11, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Uh oh!

Uh oh!

Uh oh!

baileympearson left a comment

Choose a reason for hiding this comment

Uh oh!

Uh oh!

Uh oh!

baileympearson Nov 21, 2025

Choose a reason for hiding this comment

Uh oh!

blink1073 Nov 21, 2025

Choose a reason for hiding this comment

Uh oh!

blink1073 Nov 21, 2025

Choose a reason for hiding this comment

Uh oh!

kevinAlbs Nov 25, 2025

Choose a reason for hiding this comment

Uh oh!

kevinAlbs Nov 25, 2025

Choose a reason for hiding this comment

Uh oh!

blink1073 Nov 25, 2025

Choose a reason for hiding this comment

Uh oh!

blink1073 Nov 25, 2025

Choose a reason for hiding this comment

Uh oh!

kevinAlbs left a comment

Choose a reason for hiding this comment

Uh oh!

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

6 participants

Comments

blink1073 commented Nov 11, 2025 •

edited

Loading

blink1073 Nov 11, 2025 •

edited

Loading