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Limit concurrent event creation for a room to avoid state resolution when sending bursts of events to a local room (#14977)

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Shay 2023-02-08 11:25:11 -08:00 committed by GitHub
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2 changed files with 4 additions and 3 deletions
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changelog.d/14977.misc Normal file
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@ -0,0 +1 @@
Limit concurrent event creation for a room to avoid state resolution when sending bursts of events to a local room.

6
synapse/handlers/message.py
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@ -499,9 +499,9 @@ class EventCreationHandler:
self.request_ratelimiter = hs.get_request_ratelimiter()
# We arbitrarily limit concurrent event creation for a room to 5.
# This is to stop us from diverging history *too* much.
self.limiter = Linearizer(max_count=5, name="room_event_creation_limit")
# We limit concurrent event creation for a room to 1. This prevents state resolution
# from occurring when sending bursts of events to a local room
self.limiter = Linearizer(max_count=1, name="room_event_creation_limit")
self._bulk_push_rule_evaluator = hs.get_bulk_push_rule_evaluator()