I'm learning about the Fediverse and am confused about how federation is supposed to work. I understand that there can be communities with the same name in different instances, with different content. But I also understand you can subscribe to another instance's community. For example, there are sysadmin commnunities at lemmy.world, lemmy.one, and beehaw.org (among others). If we focus on one specific community, let's say sysadmin@lemmy.world, we can find that community from any of the instances. If I go to each instance and look at sysadmin@lemmy.world from each one, I can see the same pinned post is at the top of each one instance's view ("Calling all /r/sysadmin reddit refugees!" by DarraignTheSane).

Great!

However, if I look at that pinned thread from each of the three instances, the comment stream is different. The post itself is the same, but the comment thread is a mixed bag. Some comments seem to appear in multiple instances while others only in one or two, but never all three

lemmy.world shows 11 comments lemmy.one shows 6 comments beehaw.org shows 4 comments

On lemmy.world, the second newest comment says "Nice! It feels like home." This comment also shows up on lemmy.one however not on beehaw

The newest comment on lemmy.world says "yeeey" but doesn't appear in any other instance's view of sysadmin@lemmy.world

This is just one specific example. Are you not supposed to get the same content, when looking at the same community, regardless of what instance you are logged into when viewing it? Or am I missing something?

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[–] 64bitUser@lemmy.world 3 points 1 year ago (2 children)

I understand how instances that don't federate with another instance won't show content, but I've checked a bunch of instances. Could it be that beehaw, lemmy.one, reddthat, lemm.ee, and feddit.de have all defederated from lemmy.world? They all have a different mix of content

[–] deweydecibel@lemmy.world 4 points 1 year ago (2 children)

Your confusion is warranted and I don't have a good answer.

That's kind of the issue. Everyone's vision of content in the fediverse is being filtered by their isntance, and most critically, it's being done in a non-transparent way. Looking at post from beehaw, if you didn't know any better, you'd have no idea perfectly decent comments are being hidden for no reason. Extrapolate that accross multiple instances each with different other instances defederated, and its just creating endless confusion and fracturing the social aspect of a social network.

[–] 64bitUser@lemmy.world 1 points 1 year ago

Ah it didn't occur to me that mods at various instances may be removing individual comments. Can an instance moderate the individual thread comments of a community from another instance? I was thinking that federating with another instance meant all that instance's threads and comments would be available to your users in turn. If that's not the case, then the only way for a user to be sure to get all of a community's content is view it from that community's home server

[–] GizmoLion@kbin.social 0 points 1 year ago (1 children)

I agree. Unfortunately this is a do or die problem I think. Either they find a way to bring these communities together or the fediverse remains fractured and will never pick up steam. I'm over reddit, but I long term there's no way I'm checking 5 identically named communities from 5 different points of view to try to put comment chains together...

[–] andobando@lemmy.world 0 points 1 year ago (1 children)

You're talking about different issues I think. What OP mentioned is inconsistency with one community being seen across different instances.

[–] GizmoLion@kbin.social 1 points 1 year ago* (last edited 1 year ago)

Right, so if I can see A and C from my vantage, but from A I can see ABC, and from C I can see ACD, then I have to view the same chain of replies from several different vantage points to get the whole conversation.

The inconsistency is that you can't see ABCD in a comment chain from every vantage point.
Imagine if Discord was like that... it'd have folded a day after it released lol.

I think the solution is for federation to be bilateral. If A defederates from B then A cannot see a B article and B cannot see an A article. No more fragmented comments, all comments are sent to the server the post was made on, and read from there as well. This half-copy sometimes-delayed fragmentation is just insanity even at this small of a scale, and I don't see a way to scale it without the house of cards falling.

[–] Kichae@kbin.social 2 points 1 year ago

High volumes of posts, low server bandwidth, or an instance with too few worker processes can just slow down the syncing process.