this post was submitted on 13 Jul 2023
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General Discussion
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I believe that your own instance pulls the feed from the other instance, so you're not actually browsing that other instance. If other users on your local instance are also subscribed to that particular community, then your local instance is already syncing the feed. Essentially, I believe that each federated instance replicates a copy of the other instances communities, if and when they communities are requested or subscribed to by a user on the local instance. Hope that makes sense, and if anyone has a better (or more accurate) explanation, please feel free to correct me.
Think that's more or less correct, but regarding @drturtle@lemmy.world's question about overloading, I think that it may affect folks even on other instances if Lemmy.world's overloading affects its response time to other servers attempting to sync with it.
E.g. Lemmy.world is bogged down -> Lemm.ee tries to sync posts/comments from .world -> .world takes a longer time to fulfill the request -> Lemm.ee sees older posts/comments for awhile until .world catches up to requests.
Glad to hear I'm not totally off the mark. I wonder then if instance-to-instance transactions would cause less overall congestion than local user traffic in such cases.
For example, if there are 25,000 users spread across 5 instances (with some overlap in community participation), would the instance-to-instance transactions needed to facilitate these users result in less of a performance hit than having all 25,000 users on the same instance? I don't know nearly enough about databases to make an educated guess.