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Why would certain comments or threads on other instances not show up? (self.home)

submitted 10 months ago by tigeruppercut to c/home

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I still don't really understand how the fediverse interacts very well, so this might be something basic. When I access this post through the original lemmy.world, there are (currently) 44 comments showing, but when I access it through lemmy.zip, only 9 comments show up. This entire comment thread, for example, doesn't appear through .zip. When I go to that thread's OP's profile through .zip, the comment is missing there as well.

As far as I know we're not defederated from lemmy.world, but that's the only reason I was aware of that a user's comments might not appear. Does it have to do with the fact that it's a new instance or something?

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[–] Demigodrick 6 points 10 months ago (1 children)

The issue lies with lemmy.world who are still on lemmy version 0.18.5. If there is any downtime or an issue with their server (of which historically there has been a lot of) then federation doesn't work properly and the server won't push new comments or posts to other servers. There can also be some discrepancies based on when someone subscribes too, although I don't know if that's been fixed now.

You can see this happens on other servers too:

The newest version of lemmy (0.19) contains a persistent federation queue so federation issues from between 0.19 servers should be massively reduced.

Idk why lemmy.world hasn't updated either, but it would be a benefit to the lemmyverse for them to update soon.

[–] tigeruppercut 3 points 10 months ago (1 children)

Oh, that makes sense. Interesting to see that thread through the 3 servers you listed have very different comment counts as well (7, 11, and 35 respectively).

Thanks for the explanation :)

[–] Demigodrick 4 points 10 months ago

No worries :)

I think the easiest way to summarise federation is to think of email - the servers email each other for each action that happens, but when the server doesn't work properly, that email doesn't get sent and you end up with situations like this unfortunately.