this post was submitted on 29 Jun 2023
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So I've been troubleshooting the federation issues with some other admins:

(Thanks for the help)

So what we see is that when there are many federation workers running at the same time, they get too slow, causing them to timeout and fail.

I had federation workers set to 200000. I've now lowered that to 8192, and set the activitypub logging to debugging to get queue stats. RUST_LOG="warn,lemmy_server=warn,lemmy_api=warn,lemmy_api_common=warn,lemmy_api_crud=warn,lemmy_apub=warn,lemmy_db_schema=warn,lemmy_db_views=warn,lemmy_db_views_actor=warn,lemmy_db_views_moderator=warn,lemmy_routes=warn,lemmy_utils=warn,lemmy_websocket=warn,activitypub_federation=debug"

Also, I saw that there were many workers retrying to servers that are unreachable. So, I've blocked some of these servers:

commallama.social,mayheminc.win,lemmy.name,lm.runnerd.net,frostbyrne.io,be-lemmy.org,lemmonade.marbledfennec.net,lemmy.sarcasticdeveloper.com,lemmy.kosapps.com,pawb.social,kbin.wageoffsite.com,lemmy.iswhereits.at,lemmy.easfrq.live,lemmy.friheter.com,lmy.rndmm.us,kbin.korgen.xyz

This gave good results, way less active workers, so less timeouts. (I see that above 3000 active workers, timeouts start).

(If you own one of these servers, let me know once it's back up, so I can un-block it)

Now it's after midnight so I'm going to bed. Surely more troubleshooting will follow tomorrow and in the weekend.

Please let me know if you see improvements, or have many issues still.

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[โ€“] [email protected] 3 points 1 year ago (2 children)

From what I've seen, there is a 10-second hard-coded timeout for HTTP, seems too low for the kind of load going on. Especially if the server is opening tons of connects to the same peer server.

[โ€“] Sami 3 points 1 year ago (1 children)
[โ€“] [email protected] 2 points 1 year ago

That's for encryption signatures.

I'm talking about HTTP timeouts for connection:

https://github.com/LemmyNet/lemmy/blob/0f91759e4d1f7092ae23302ccb6426250a07dab2/src/lib.rs#L39

/// Max timeout for http requests
pub(crate) const REQWEST_TIMEOUT: Duration = Duration::from_secs(10);