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Quick video demonstrating that lemmy.world sends every activity out twice (i.imgur.com)

submitted 7 months ago by freamon@lemmy.world to c/fediverse@lemmy.world

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I realise this is a known issue and that lemmy.world isn't the only instance that does this. Also, I'm aware that there are other things affecting federation. But I'm seeing some things not federate, and can't help thinking that things would be going smoother if all the output from the biggest lemmy instance wasn't 50% spam.

Hopefully this doesn't seem like I'm shit-stirring, or trying to make the Issue I'm interested in more important than other Issues. It's something I mention occasionally, but it might be a bit abstract if you're not the admin of another instance.

The red terminal is a tail -f of the nginx log on my server. The green terminal is outputting some details from the ActivityPub JSON containing the Announce. You should be able to see the correlation between the lines in the nginx log, and lines from the activity, and that everything is duplicated.

This was generated by me commenting on an old post, using content that spawns an answer from a couple of bots, and then me upvoting the response. (so CREATE, CREATE, LIKE, is being announced as CREATE, CREATE, CREATE, CREATE, LIKE, LIKE). If you scale that up to every activity by every user, you'll appreciate that LW is creating a lot of work for anyone else in the Fediverse, just to filter out the duplicates.

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[-] freamon@lemmy.world 29 points 7 months ago

I can't re-produce anything, because I don't run Lemmy on my server. It's possible to infer that's it's related to the software (because LW didn't do this when it was on 0.18.5). However, it's not something that, for example, lemmy.ml does. An admin on LW matrix chat suggested that it's likely a combination of instance configuration and software changes, but a bug report from me (who has no idea how LW is set up) wouldn't be much use.

I'd gently suggest that, if LW admins think it's a configuration problem, they should talk to other Lemmy admins, and if they think Lemmy itself plays a role, they should talk to the devs. I could be wrong, but this has been happening for a while now, and I don't get the sense that anyone is talking to anyone about it.

[-] Iceblade02@lemmy.world 13 points 7 months ago

You can still make a bug report, so that somebody with the actual means can look into it. If every action is duplicated that'd be pretty severe, if not, well it'll be closed.

[-] freamon@lemmy.world 19 points 7 months ago

A bug report for software I don't run, and so can't reproduce would be closed anyway. I think 'steps to reproduce' is pretty much the first line in a bug report.

If I ran a server that used someone else's software to allow users to download a file, and someone told me that every 2nd byte needed to be discarded, I like to think I'd investigate and contact the software vendors if required. I wouldn't tell the user that it's something they should be doing. I feel like I'm the user in this scenario.