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perf: Don't attempt to process disconnected rooms #1316

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nex wants to merge 4 commits from nex/perf/dont-process-disconnected-rooms into main
pull from: nex/perf/dont-process-disconnected-rooms
merge into: continuwuation:main
Conversation 3 Commits 4 Files changed 15 +194 -14
nex commented 2026-01-27 03:19:02 +00:00
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Sometimes we'll continue to receive requests and transaction attempts for rooms we aren't in anymore (i.e. have no local users). This PR adds a quick check to several processing points to short circuit if we don't think we're in the given room.
This primarily reduces resource consumption for left-but-not-banned rooms, but also has the side effect that left rooms are far less likely to state reset users back in. Also prevents us serving corrupted state, lol.

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<!-- In order to help reviewers know what your pull request does at a glance, you should ensure that 1. Your PR title is a short, single sentence describing what you changed 2. You have described in more detail what you have changed, why you have changed it, what the intended effect is, and why you think this will be beneficial to the project. If you have made any potentially strange/questionable design choices, but didn't feel they'd benefit from code comments, please don't mention them here - after opening your pull request, go to "files changed", and click on the "+" symbol in the line number gutter, and attach comments to the lines that you think would benefit from some clarification. --> Sometimes we'll continue to receive requests and transaction attempts for rooms we aren't in anymore (i.e. have no local users). This PR adds a quick check to several processing points to short circuit if we don't think we're in the given room. This primarily reduces resource consumption for left-but-not-banned rooms, but also has the side effect that left rooms are *far* less likely to state reset users back in. Also prevents us serving corrupted state, lol. <!-- Example: This pull request allows us to warp through time and space ten times faster than before by double-inverting the warp drive with hyperheated jump fluid, both making the drive faster and more efficient. This resolves the common issue where we have to wait more than 10 milliseconds to engage, use, and disengage the warp drive when travelling between galaxies. --> <!-- Closes: #... --> <!-- Fixes: #... --> <!-- Uncomment the above line(s) if your pull request fixes an issue or closes another pull request by superseding it. Replace `#...` with the issue/pr number, such as `#123`. --> **Pull request checklist:** <!-- You need to complete these before your PR can be considered. 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perf: Don't handle expensive requests for rooms we aren't in
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b2b68ecc5f
 
Mostly borrowed from dendrite:

a042861/federationapi/routing/routing.go (L601)
chore: Add news fragment
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nex requested review from Owners 2026-01-27 03:35:41 +00:00
Aranjedeath approved these changes 2026-01-27 18:08:02 +00:00
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I have been using this in production since last night and I have not noticed new breakage. I might suggest making the logs trace or something instead of debug_warn

I have been using this in production since last night and I have not noticed new breakage. I might suggest making the logs trace or something instead of debug_warn
nex commented 2026-01-27 19:01:13 +00:00
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I might suggest making the logs trace or something instead of debug_warn

Could probably drop them down to a debug info, but they might actually be important logs that can indicate deeper issues so sticking them lower than debug info is probably too far. Although given the rarity of this during normal operation I think warn is probably fine

> I might suggest making the logs trace or something instead of debug_warn Could probably drop them down to a debug info, but they might actually be important logs that can indicate deeper issues so sticking them lower than debug info is probably too far. Although given the rarity of this during normal operation I think warn is probably fine
Aranjedeath commented 2026-01-27 19:08:21 +00:00
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Slightly more strongly: the objection was to debug_* anything, if they are key federation breakages they should not be compiled out in release builds

Slightly more strongly: the objection was to debug_* anything, if they are key federation breakages they should not be compiled out in release builds
nex force-pushed nex/perf/dont-process-disconnected-rooms from 8f35c489a2
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