From 786de8570bf7ff14a8b98dbad6b9b9c18b05faf7 Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Fri, 6 Sep 2024 11:12:54 +0100 Subject: Speed up fetching partial-state rooms on sliding sync (#17666) Instead of having a large cache of `room_id -> bool` about whether a room is partially stated, replace with a "fetch rooms the user is which are partially-stated". This is a lot faster as the set of partially stated rooms at any point across the whole server is small, and so such a query is fast. The main issue with the bulk cache lookup is the CPU time looking all the rooms up in the cache. --- synapse/storage/databases/main/room.py | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'synapse/storage') diff --git a/synapse/storage/databases/main/room.py b/synapse/storage/databases/main/room.py index 68b0806041..e0b7b7e194 100644 --- a/synapse/storage/databases/main/room.py +++ b/synapse/storage/databases/main/room.py @@ -1382,6 +1382,30 @@ class RoomWorkerStore(CacheInvalidationWorkerStore): partial_state_rooms = {row[0] for row in rows} return {room_id: room_id in partial_state_rooms for room_id in room_ids} + @cached(max_entries=10000, iterable=True) + async def get_partial_rooms(self) -> AbstractSet[str]: + """Get any "partial-state" rooms which the user is in. + + This is fast as the set of partially stated rooms at any point across + the whole server is small, and so such a query is fast. This is also + faster than looking up whether a set of room ID's are partially stated + via `is_partial_state_room_batched(...)` because of the sheer amount of + CPU time looking all the rooms up in the cache. + """ + + def _get_partial_rooms_for_user_txn( + txn: LoggingTransaction, + ) -> AbstractSet[str]: + sql = """ + SELECT room_id FROM partial_state_rooms + """ + txn.execute(sql) + return {room_id for (room_id,) in txn} + + return await self.db_pool.runInteraction( + "get_partial_rooms_for_user", _get_partial_rooms_for_user_txn + ) + async def get_join_event_id_and_device_lists_stream_id_for_partial_state( self, room_id: str ) -> Tuple[str, int]: @@ -2341,6 +2365,7 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore): self._invalidate_cache_and_stream( txn, self._get_partial_state_servers_at_join, (room_id,) ) + self._invalidate_all_cache_and_stream(txn, self.get_partial_rooms) async def write_partial_state_rooms_join_event_id( self, @@ -2562,6 +2587,7 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore): self._invalidate_cache_and_stream( txn, self._get_partial_state_servers_at_join, (room_id,) ) + self._invalidate_all_cache_and_stream(txn, self.get_partial_rooms) DatabasePool.simple_insert_txn( txn, -- cgit 1.5.1