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When a user disconnects from the hub, we would spawn off a goroutine which would make a cluster request, and then update the user status as offline in the DB. This was another case of unbounded concurrency where the number of goroutines spawned was user controlled. Therefore, we would see a clear spike in DB connections on master when a lot of users would suddenly disconnect. To fix this, we implement concurrency control in two areas: 1. In making the cluster request. We implement a counting semaphore per-hub to avoid making unbounded cluster requests. 2. We use a buffered channel with a periodic flusher to process status updates. We also add a new store method to upsert multiple statuses in a single query. The statusUpdateThreshold is set to 32, which means no more than 32 rows will be upserted at one time, keeping the SQL query load reasonable. https://mattermost.atlassian.net/browse/MM-64298 ```release-note We improve DB connection spikes on user disconnect by processing status updates in batches. ```
Mattermost is an open core, self-hosted collaboration platform that offers chat, workflow automation, voice calling, screen sharing, and AI integration. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React, runs as a single Linux binary, and relies on PostgreSQL. A new compiled version is released under an MIT license every month on the 16th.
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