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add a cache to have_seen_event (#9953)

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Empirically, this helped my server considerably when handling gaps in Matrix HQ. The problem was that we would repeatedly call have_seen_events for the same set of (50K or so) auth_events, each of which would take many minutes to complete, even though it's only an index scan.
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Richard van der Hoff 2021-06-01 12:04:47 +01:00 • committed by GitHub
parent 10e6d2abce
commit b4b2fd2ece
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10 changed files with 206 additions and 21 deletions
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synapse/storage/databases/main/cache.py
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@ -168,6 +168,7 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
backfilled,
):
self._invalidate_get_event_cache(event_id)
self.have_seen_event.invalidate((room_id, event_id))
self.get_latest_event_ids_in_room.invalidate((room_id,))