this post was submitted on 08 Jun 2023
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Lemmy
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What happens to communities on instances that goes down? That's where I fear there will be real issues. Unless there's a way for one instance to properly adopt a community in another instance first.
That's definitely my main concern I have with this federated infrastructure. It's basically the same as IMAP email: if the server goes down, your account and everything it's associated with goes down with it.
It's a neat idea and has some benefits, but there really needs to be some sort of backup system in place. Maybe something like mirror instances, where anyone could spin up an instance with the sole purpose of mirroring another instance in case it goes down.
I was thinking this the other day. Without having read the spec, it seems like mirroring should be fairly straightforward - but then once an instance has gone down, how do the users find which mirror is promoted to the new main? Or should the mirrors be treated like backups, and just used to populate a new community on whatever instance is chosen (and then mirror from the new source)?
Definitely need some kind of replication/mirroring to occur between instances for DR, I was looking at how other decentralized systems for inspiration. Something like RAID where it's tolerant of one or two drive failures could be translated to Lemmy. When you set up a new instance it allows you to opt-in to a peer network where you host backup content from several other instances and your instance is backed up to several other (non-overlapping) instances.