Sorry, I mean when I view the comment via my instance. I don’t understand why my instance needs to receive the votes/likes directly, instead of my instance fetching them from feddit.dk when I request the comment.
Sorry, I mean when I view the comment via my instance. I don’t understand why my instance needs to receive the votes/likes directly, instead of my instance fetching them from feddit.dk when I request the comment.
SorteKanin@feddit.dk 1 week ago
Your instance doesn’t pull the upvotes from other instances. That would not be scalable. How would it know when to pull again, to see new upvotes? When would it stop pulling periodically? Never? And you’d have to do this for every single post and comment everywhere.
No, instead ActivityPub uses a push mechanism here. So any new activity is pushed out to the ones that are deemed relevant to know about the activity. Any other instances are unaware.
catloaf@lemm.ee 1 week ago
Pulling the data when a user requests a post/comment (with a cooldown/cache for popular posts) isn’t any more or less scalable than feddit.de pushing the same data whether it’s been requested or not. If anything, I’d think pushing data when it’s not necessarily needed would be less scalable.
But if it has to be a push model, why doesn’t feddit.dk push the votes it knows about along with the rest of the data?
SorteKanin@feddit.dk 1 week ago
That would definitely be less scalable. That would entail pulling every single time a user views a post or comment. That’s simply not feasible. There are far, far more views of content than there are posts, comments and votes.
Also what about stuff that isn’t seen? What if nobody is logged in or nobody looks at the New sort? You need the votes before you even show the user anything, otherwise you can’t sort the votes.
This has been explained elsewhere in the thread, see feddit.dk/post/7628338/10255563
catloaf@lemm.ee 1 week ago
True, but that’s why I mentioned a cache or cooldown. Once every two minutes is plenty, unless Lemmy really blows up and we have hundreds of instances trying to fetch a very popular post.
You have a point about new sort, but you could approximate it by sorting what’s known to an instance. It’s not ideal, but it’s at least something. Maybe it would make sense to push just that feed, or to fetch a subset periodically.
I read that comment tree, but it doesn’t answer my question. If someone on Mastodon likes a post on feddit.dk, I don’t see any reason feddit.dk can’t communicate that to lemm.ee when I go look at it.