OpenIM Self-Hosting Pitfalls (3): Scaling Errors
We deployed OpenIM version 3.5.1 in our Kubernetes environment for our company’s IM scenarios. During development and operation, we encountered some issues. Here, I’ll document the details of the problems and the resolution process. Problem Description Simply put: Users are clearly online but cannot receive real-time messages. They can only receive push notifications, and messages only appear in the chat interface after a delay. This problem only occurs after scaling out. Everything works fine with a single node. The root cause is an inconsistency in OpenIM’s internal load balancing mechanism, causing messages to be sent to the wrong service node. ...