an ELI5:
When you set up a lemmy instance, it has no idea other instances exist. It’s like throwing you into a web browser with no search engine. You don’t immediately see every single website, you have someone tell you about a cool website you found, and then you type it into the address bar, and save it.
It’s kind of the same thing with Lemmy instances and communities. Once a user types this syntax into the search prompt:
!community@instance.comIt will try and contact instance.com for that community. If it exists, the user can subscribe and the instances will now receive and send new posts to each other.
Mastodon has this issue too, fwiw.
I wouldn’t say it’s an issue. Great way to make new instances not be flooded with 500000 submissions per second.
What does it mean “fetching communities on my home instance”?
Since no one answered: I think the users on the instance (copy of Lemmy) need to federate (connect) with other instances in order for the first instance to be federated (semi-permanently in communication) with those other instances.
I thought it had to do with communities
It is communities. You can be federated with another instance but until a user subscribes to a specific community it won’t federate or appear in all
What is fetching
I think they mean being the first user to subscribe to a community on their instance. If no one else has subscribed yet it won’t federate over. First subscriber needs to search the whole community url then after any others can find it in search just by name.
Instances only federate communities once a user has subscribed to them. Otherwise instances would be inundated with hundreds of communities no one even wants.
Yeah. The way it works with Lemmy is that communities are federated one-by-one with an instance, rather than whole instances federating with other instances.
This is actually bad for the instance. It costs a lot more resources to send and fetch submissions from a bunch more instances.
That juicy /all feed though, worth it.
Eh, even with a LOT of subscriptions lemmy really isn’t that heavy.
It’s the outgoing federation (I hear) that really starts taking more resources
Lemmy ain’t heavy…it’s my brother!
I am sure more knowledgeable people will provide the right answers. But I think it means that when you set up your own lemmy instance, you need to add the communities to it.
not really add.
when you set up an instance, all will be empty. the moment an user subscribe to a community for the first time, that community will start appearing on all, for everyone to see.
for this reason all is different for every instance.
the motivation for it is resources. if a new instance would receive updates from all the communities on all the instances, it would be very much like ddos. and a small instance will not be able to endure it.
A real Stakhanovite of the fediverse!
