element-hq / element-hq/synapse

Leaving a room can cause you to be hammered with GET /event requests from other servers

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A-Federation A-Performance O-Uncommon S-Tolerable T-Defect
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Description

This issue has been migrated from [#4726](https://github.com/matrix-org/synapse/issues/4726).

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And not even for your own events :(

I ran a script to peacefully decommission a homeserver by having it leave all rooms, and shortly after the events went out I was being hammered with GET /event requests for the rooms I just left. Surely I shouldn't be receiving these requests anymore given there's no guarantee that the homeserver even knows about the room anymore?

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