Question: Where is federated content stored? (lemm.ee)

submitted 1 year ago by Machefi@lemm.ee to c/fediverse@lemmy.world

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I've been on Lemmy for some time now and it's time for me to finally understand how Federation works. I have general idea and I have accounts on three federated instances, but I need some details.

Let Alpha, Beta, Gamma and Delta be four federated instances. I have an account on Alpha and create a post in a community on Beta. A persoson from Gamma comments on it and a person from Delta upvotes the post and the comment.

The question: On which instances are the post, the comment and the upvotes stored?

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[-] Rottcodd@kbin.social 44 points 1 year ago

As already noted, on all of them.

The easy way to grasp how it works:

When you, on instance.alpha, view a community on instance.beta, you aren't actually on community@instance.beta. You're actually on an entirely separate copy - community@instance.beta@instance.alpha. That's the community you're reading and posting to and upvoting/downvoting in. Meanwhile, people on other instances are each on their own locally hosted copies of the same community.

The lemmy software (or kbin or mastodon or whatever) then periodically syncs up all the local copies of community@instance.beta, so you all end up looking at (more or less) the same content, even though it's actually a bunch of technically separate communities.