I’ve never been able to successfully sync posts from a kbin Magazine to Lemmy. I also haven’t seen Lemmy users show up in kbin communities so I assumed that subscriptions were unilateral (kbin users have access to Lemmy but not vice versa).
this post was submitted on 30 Jun 2023
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I’ve seen people comment from feddit.de, shitjustworks, techns, etc comment on kbin originated posts. Im thinking it’s possible to see most content from most federated instances across Lemmy and kbin, but it’s not that reliable.
My account on lemmy.one has federated fine with kbin.social. My personal lemmy instance doesn't. I think it's a version issue, but you get full access both ways.
I have also noticed this problem. Kbin is very new, and (as far as I understand) works a little different than Lemmy. It also doesn't have an API yet, and I suspect that this has something to do with the problem. Hopefully it will be solved in the future. It's a shame because Kbin is getting quite large so the poor sync is a very noticeable problem.
Do posts from one website only appear on the other if the community already has subscribers?
Yes.
When instances federate, they don't just automatically share content. They only share the content from a specific community/magazine if somebody from the federated instance subscribes through that instance to the community/magazine on the host instance.
If I'm following it all correctly, what actually happens under the hood is that subscribing to a community/magazine on another instance triggers the creation of a new community/magazine on your home instance, which from then on will mirror the content on the original.
So in your example, the original is [email protected]. Initially, it's not going to appear on kbin.social - there has to be interest in it first, as demonstrated by the fact that somebody from kbin.social subscribes to it.
At that point, for all intents and purposes a new magazine is actually created on kbin.social - [email protected]@kbin.social. So you're not actually accessing [email protected] through kbin.social - you're accessing a mirror that's hosted on kbin.social. And the trigger for creating that is someone on kbin.social subscribing to [email protected].
At least I'm pretty sure that's how it works - note that I'm just some guy who likes to figure out how things work and not a dev.
So, if 10 different users subscribed to 10 different things all that data is now synced and hosted on their server of origin? That sounds like the data can get massive fast.