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Limit number of events in a replication request #10118

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Jun 4, 2021
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1 change: 1 addition & 0 deletions changelog.d/10118.bugfix
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix a bug introduced in Synapse 1.33.0 which caused replication requests to fail when receiving a lot of very large events via federation.
5 changes: 3 additions & 2 deletions synapse/handlers/federation.py
Original file line number Diff line number Diff line change
Expand Up @@ -3056,8 +3056,9 @@ async def persist_events_and_notify(
"""
instance = self.config.worker.events_shard_config.get_instance(room_id)
if instance != self._instance_name:
# Limit the number of events sent over federation.
for batch in batch_iter(event_and_contexts, 1000):
# Limit the number of events sent over replication. We choose 200
# here as that is what we default to in `max_request_body_size(..)`
for batch in batch_iter(event_and_contexts, 200):
result = await self._send_events(
instance_name=instance,
store=self.store,
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