From f8e8ec013bad0afb010d8cfda3da63e36d37fea5 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Tue, 10 Apr 2018 14:00:24 +0100 Subject: [PATCH] Note why we're limiting concurrent event sends --- synapse/handlers/message.py | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py index 1814b205daff..54cd691f91bc 100644 --- a/synapse/handlers/message.py +++ b/synapse/handlers/message.py @@ -557,6 +557,11 @@ def create_and_send_nonmember_event( See self.create_event and self.send_nonmember_event. """ + # We limit the number of concurrent event sends in a room so that we + # don't fork the DAG too much. If we don't limit then we can end up in + # a situation where event persistence can't keep up, causing + # extremities to pile up, which in turn leads to state resolution + # taking longer. with (yield self.limiter.queue(event_dict["room_id"])): event, context = yield self.create_event( requester,