From 408c13801a244a89d23f9c8e8ccce1b3d049abb6 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Mon, 30 Oct 2023 14:47:57 +0000 Subject: Add fast path for replication events stream fetch (#16580) We can bail early if the from token is greater than or equal to the current token. --- synapse/replication/tcp/streams/events.py | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'synapse') diff --git a/synapse/replication/tcp/streams/events.py b/synapse/replication/tcp/streams/events.py index 38823113d8..57138fea80 100644 --- a/synapse/replication/tcp/streams/events.py +++ b/synapse/replication/tcp/streams/events.py @@ -157,6 +157,12 @@ class EventsStream(_StreamFromIdGen): current_token: Token, target_row_count: int, ) -> StreamUpdateResult: + # The events stream cannot be "reset", so its safe to return early if + # the from token is larger than the current token (the DB query will + # trivially return 0 rows anyway). + if from_token >= current_token: + return [], current_token, False + # the events stream merges together three separate sources: # * new events # * current_state changes -- cgit 1.5.1