this post was submitted on 17 Jun 2023
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Instances hold copies of other instances' communities? I thought it was simply an API call to the other server. Not an expert, tho.
That is correct, and this is why a new instance only shows the most recent 20 posts for a community until someone from the viewing instance subscribes to it. From that moment forward (barring de-federation), the host instance sends updates to the viewing instance. The viewing instance provides content to its users from the local copy that it stores.
Yep, on regular intervals your instance asks for the latest data from the remote community and that's what it serves to its users. So it doesn't matter if 1 person or 100 are subbed on asingle remote, it's the same number of calls.
Is there a reason for working like this and not simply be a portal to the other instance's community?
Probably for reliability and stability — otherwise, every view from every federated instance would create a new request to the hosting instance. The protocol itself would basically DDoS smaller instances. Also you can still read the cached version on your home instance if the remote instance is temporarily down.