Load balancing mongos

csac · October 4, 2023, 2:07am

Hello,

I have created a sharded environment with 2 mongos. I am trying to use HAProxy as a load balancer for the mongos. When I try to connect using the loadBalanced=true flag I always get error.

MongoCompatibilityError: Driver attempted to initialize in load balancing mode, but the server does not support this mode.

Maybe I have missed some configurations or is it possible to use the loadBalanced=true flag when using HAProxy as load balancer for the mongos?

Kobe_W · October 4, 2023, 4:36am

are you saying you put 2 mongos behind a HAProxy ?

what’s your connection URI like?

csac · October 4, 2023, 5:45am

Yes. It is correct.
My connection URI is mongodb://[host]:27017/test?loadBalanced=true

Kobe_W · October 4, 2023, 10:44pm

i don’t know how mongodb handles this options, but i got below links. Hope they can help:

https://jira.mongodb.org/browse/SERVER-58502

github.com

mongodb/specifications/blob/master/source/load-balancers/load-balancers.rst

=====================
Load Balancer Support
=====================

:Status: Accepted
:Minimum Server Version: 5.0

.. contents::

--------

Abstract
========

This specification defines driver behaviour when connected to MongoDB services
through a load balancer.

META
====

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