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Comments are different between instances for the same community? Is this supposed to happen? (lemmy.world)

submitted 1 year ago by [email protected] to c/[email protected]

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I thought if I subscribed to a community on a different instance, all the participation is the same. However, I have just realised that the comments are different on the communities even though they should be shared imo

Example: https://lemmy.world/c/[email protected]/data_type/Post/sort/Active/page/1

https://lemmy.ml/c/unresolvedmysteries

You can see that the same post for each instance has different comments showing. Then, in fact, participation isn't the same between communities. Is this a bug or correct?

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[–] [email protected] 4 points 1 year ago

I'd love to help you figure this out, but your second link takes me to a 502 error.

Anyway, my guess is that one instance you're on federates with certain instances, and one does not. So if you're on instance A and B, A federates with C, but B does not, so from B you won't see comments from C. But I admittedly don't know what the differences are between the comment sections you're seeing, so I could be completely wrong.

[–] [email protected] 1 points 1 year ago

Banned users can influence that, load/lag between instances can cause propagation delays, and your own language settings can mean that some posts are filtered from your view.

[–] [email protected] 1 points 1 year ago

I'm not 100% sure this is what's going on here, but maybe...

Say A, B, and C are instances and A and B federate and B and C federate, but A and C do not. Then, suppose there is a thread on B. If someone comments on it from A and someone else comments from C.

Again, I'm not 100% sure this is how it works, but maybe A doesn't get the comment made on C and vice versa. B would get all comments made on A and C, and A and C would get all comments made on B.

Maybe. Just a thought.

[–] [email protected] 1 points 1 year ago

It's not really that it's supposed to happen and more that it can't really be helped. Since Lemmy is federated instead of centralized, there is no central server to act as the source of truth. Comments have to be replicated across instances; that's not happening continuously either. So different instances will have different records of community interactions, but they should variously sync, unless a server is blocking content from another server.

[–] [email protected] 1 points 1 year ago

I think it’s either a bug or related to server load. I made a post on this community noting the same thing. It’s like instances are not communicating with each other right now.

I looked at the same post from 4 different instances and got four different results in both comment count and votes.

From the server it was originally posted on (currently at 9 comments): https://lemmy.ml/post/1244889

lemmy.world (8 comments): https://lemmy.world/post/112477

beehaw.org (10 comments): https://beehaw.org/post/542091

sh.itjust.works (5 comments): https://sh.itjust.works/post/79680