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Against Lemmy Karma
(lemmy.world)
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this post was submitted on 06 Jul 2023
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General Discussion
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So your instance tracks karma for users on other instances by adding it up one visible post at a time, instead of querying their instances for the total directly?
Does it keep a permanent database with running totals for every user on every federated instance?
Yes essentially. The way federation works is when a user subscribed to a community, the community looks at the server the user is on. If it's one that it hasn't seen before it adds the server to it's federation list.
Every interaction on on each instance is sent to the host instance, who then tells everyone on its federation list. The receiving instance basically only ever listens for updates, it rarely/never ASKS for updates. And karma totals aren't something sent as part of these messages. So when someone votes on something it just increments the karma count at the same time.
Lemmy is built on a generic protocol not really designed to be a Reddit-alike, so some things are workarounds