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Pull less state out if we fail to backfill (#16788)

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Sometimes we fail to fetch events during backfill due to missing state,
and we often end up querying the same bad events periodically (as people
backpaginate). In such cases its likely we will continue to fail to get
the state, and therefore we should try *before* loading the state that
we have from the DB (as otherwise it's wasted DB and memory).

---------

Co-authored-by: reivilibre <oliverw@matrix.org>
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Erik Johnston 2024-01-10 14:42:13 +00:00 committed by GitHub
parent 1485cfd0f2
commit 0a96fa52a2
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2 changed files with 13 additions and 9 deletions
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changelog.d/16788.misc Normal file
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@ -0,0 +1 @@
Pull less state out of the DB when we retry fetching old events during backfill.

21
synapse/handlers/federation_event.py
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@ -1141,16 +1141,8 @@ class FederationEventHandler:
partial_state_flags = await self._store.get_partial_state_events(seen)
partial_state = any(partial_state_flags.values())
# Get the state of the events we know about
ours = await self._state_storage_controller.get_state_groups_ids(
room_id, seen, await_full_state=False
)
# state_maps is a list of mappings from (type, state_key) to event_id
state_maps: List[StateMap[str]] = list(ours.values())
# we don't need this any more, let's delete it.
del ours
state_maps: List[StateMap[str]] = []
# Ask the remote server for the states we don't
# know about
@ -1169,6 +1161,17 @@ class FederationEventHandler:
state_maps.append(remote_state_map)
# Get the state of the events we know about. We do this *after*
# trying to fetch missing state over federation as that might fail
# and then we can skip loading the local state.
ours = await self._state_storage_controller.get_state_groups_ids(
room_id, seen, await_full_state=False
)
state_maps.extend(ours.values())
# we don't need this any more, let's delete it.
del ours
room_version = await self._store.get_room_version_id(room_id)
state_map = await self._state_resolution_handler.resolve_events_with_store(
room_id,