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Server will be migrated (More power!) (lemmy.world)

submitted 2 years ago by [email protected] to c/[email protected]

382 comments fedilink hide all child comments

So after we've extended the virtual cloud server twice, we're at the max for the current configuration. And with this crazy growth (almost 12k users!!) even now the server is more and more reaching capacity.

Therefore I decided to order a dedicated server. Same one as used for mastodon.world.

So the bad news... we will need some downtime. Hopefully, not too much. I will prepare the new server, copy (rsync) stuff over, stop Lemmy, do last rsync and change the DNS. If all goes well it would take maybe 10 minutes downtime, 30 at most. (With mastodon.world it took 20 minutes, mainly because of a typo :-) )

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[–] [email protected] 2 points 2 years ago (1 children)

Apparently it's not ideal at Horizontal scaling (that's what I've picked up from reading stuff here, could be wrong)

[–] [email protected] 1 points 2 years ago (2 children)

I think they can horizontally scale the Postgres maybe? Postgres is probably the biggest performance bottleneck.

[–] [email protected] 3 points 2 years ago

Databases are also the hardest bit to horizontally scale. Web servers are easy cos they're (usually) stateless . It's state that's hard to scale out.

[–] [email protected] 2 points 2 years ago (1 children)

Have they implemented the postgres? Last I read they were still using websockets (I think I'm not a programmer and don't know what all that means lmfao)

[–] [email protected] 2 points 2 years ago* (last edited 2 years ago) (1 children)

Postgres is a database. Websockets is a communication method between the browser and the server.

So the infrastructure is like this:

Browser <--Websockets--> Server <--> Postgres

So there's a couple problems here. First of all, websockets are very resource heavy so too many of them will slow down the server, that's why they are working on replacing websockets with something else. And second, the database (Postgres) is getting overloaded so they need to figure out how to scale it up or use it more efficiently.

[–] [email protected] 3 points 2 years ago (1 children)

Man, the place I work at has a single DB instance (with a read replica) serving millions of users. I'm not saying this should be true everywhere, but I don't understand how the postgres is buckling here. Does Lemmy have a bunch of horrifically unoptimized queries, or is the DB just on an underpowered machine?

[–] [email protected] 2 points 2 years ago

Yes to both. Lemmy does have a few PRs to make the queries more efficient (and not just blind generic ORM calls) but most instances outside of lemmy.world are very underpowered (which makes federation synchronization slow).