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Faster remote room joins (worker mode): do not populate external hosts-in-room cache when sending events as this requires blocking for full state. (#14749)

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Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>
Co-authored-by: Sean Quah <seanq@matrix.org>
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reivilibre 2023-01-11 13:21:53 +00:00 committed by GitHub
parent 7f2cabf271
commit 5172c8c403
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2 changed files with 17 additions and 5 deletions
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changelog.d/14749.misc Normal file
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@ -0,0 +1 @@
Faster remote room joins (worker mode): do not populate external hosts-in-room cache when sending events as this requires blocking for full state.

21
synapse/handlers/message.py
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@ -1531,12 +1531,23 @@ class EventCreationHandler:
external federation senders don't have to recalculate it themselves.
"""
for event, _ in events_and_context:
if not self._external_cache.is_enabled():
return
if not self._external_cache.is_enabled():
return
# If external cache is enabled we should always have this.
assert self._external_cache_joined_hosts_updates is not None
# If external cache is enabled we should always have this.
assert self._external_cache_joined_hosts_updates is not None
for event, event_context in events_and_context:
if event_context.partial_state:
# To populate the cache for a partial-state event, we either have to
# block until full state, which the code below does, or change the
# meaning of cache values to be the list of hosts to which we plan to
# send events and calculate that instead.
#
# The federation senders don't use the external cache when sending
# events in partial-state rooms anyway, so let's not bother populating
# the cache.
continue
# We actually store two mappings, event ID -> prev state group,
# state group -> joined hosts, which is much more space efficient