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Lemmy Federation Architecture Change Proposal (github.com)

submitted 1 year ago by [email protected] to c/[email protected]

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https://github.com/LemmyNet/lemmy/issues/3245

I posted far more details on the issue then I am putting here-

But, just to bring some math in- with the current full-mesh federation model, assuming 10,000 instances-

That will require nearly 50 million connections.

Each comment. Each vote. Each post, will have to be sent 50 million seperate times.

In the purposed hub-spoke model, We can reduce that by over 99%, so that each post/vote/comment/etc, only has to be sent 10,000 times (plus n*(n-1)/2 times, where n = number of hub servers).

The current full mesh architecture will not scale. I predict, exponential growth will continue to occur.

Let's work on a solution to this problem together.

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[–] [email protected] 1 points 1 year ago (1 children)

I'm just not seeing a benefit here, I think this is a solution to the wrong problem. Your proposal in theory cuts outbound updates from the big hubs, but in reality they're only updating a subset of other instances for any given update, and it doesn't do anything to help with inbound updates. And to do that, you have to solve a pretty tricky problem.

If my instance gets an update from Beehaw, I can validate that they're allowed to do so, because Beehaw has a TLS certificate that says "Yep, this is actually Beehaw." If you introduce a hub system, I need some way to determine that the hub system that's telling me "Beehaw has an update for you" is allowed to send updates on behalf of Beehaw.

[–] [email protected] 2 points 1 year ago

To clarify-

After feedback/comments, I have modified the idea- this would be a optional local proxy/hub/delegation server/service, hosted by the instance owners.

https://github.com/LemmyNet/lemmy/issues/3245#issuecomment-1601585922

Ie- you can optionally scale your federation updates, independent of your main application server.