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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.
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3 changed files with 35 additions and 20 deletions
1
changelog.d/17666.misc
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1
changelog.d/17666.misc
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Small performance improvement in speeding up sliding sync.
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@ -333,11 +333,7 @@ class SlidingSyncRoomLists:
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# Find which rooms are partially stated and may need to be filtered out
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# depending on the `required_state` requested (see below).
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partial_state_room_map = (
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await self.store.is_partial_state_room_batched(
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filtered_sync_room_map.keys()
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)
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)
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partial_state_rooms = await self.store.get_partial_rooms()
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# Since creating the `RoomSyncConfig` takes some work, let's just do it
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# once.
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@ -349,7 +345,7 @@ class SlidingSyncRoomLists:
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filtered_sync_room_map = {
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room_id: room
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for room_id, room in filtered_sync_room_map.items()
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if not partial_state_room_map.get(room_id)
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if room_id not in partial_state_rooms
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}
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all_rooms.update(filtered_sync_room_map)
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@ -409,9 +405,7 @@ class SlidingSyncRoomLists:
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with start_active_span("assemble_room_subscriptions"):
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# Find which rooms are partially stated and may need to be filtered out
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# depending on the `required_state` requested (see below).
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partial_state_room_map = await self.store.is_partial_state_room_batched(
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sync_config.room_subscriptions.keys()
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)
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partial_state_rooms = await self.store.get_partial_rooms()
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for (
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room_id,
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@ -431,7 +425,7 @@ class SlidingSyncRoomLists:
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# Exclude partially-stated rooms if we must wait for the room to be
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# fully-stated
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if room_sync_config.must_await_full_state(self.is_mine_id):
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if partial_state_room_map.get(room_id):
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if room_id in partial_state_rooms:
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continue
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all_rooms.add(room_id)
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@ -514,11 +508,7 @@ class SlidingSyncRoomLists:
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# Find which rooms are partially stated and may need to be filtered out
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# depending on the `required_state` requested (see below).
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partial_state_room_map = (
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await self.store.is_partial_state_room_batched(
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filtered_sync_room_map.keys()
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)
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)
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partial_state_rooms = await self.store.get_partial_rooms()
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# Since creating the `RoomSyncConfig` takes some work, let's just do it
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# once.
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@ -530,7 +520,7 @@ class SlidingSyncRoomLists:
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filtered_sync_room_map = {
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room_id: room
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for room_id, room in filtered_sync_room_map.items()
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if not partial_state_room_map.get(room_id)
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if room_id not in partial_state_rooms
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}
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all_rooms.update(filtered_sync_room_map)
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@ -590,9 +580,7 @@ class SlidingSyncRoomLists:
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with start_active_span("assemble_room_subscriptions"):
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# Find which rooms are partially stated and may need to be filtered out
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# depending on the `required_state` requested (see below).
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partial_state_room_map = await self.store.is_partial_state_room_batched(
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sync_config.room_subscriptions.keys()
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)
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partial_state_rooms = await self.store.get_partial_rooms()
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for (
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room_id,
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@ -624,7 +612,7 @@ class SlidingSyncRoomLists:
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# Exclude partially-stated rooms if we must wait for the room to be
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# fully-stated
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if room_sync_config.must_await_full_state(self.is_mine_id):
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if partial_state_room_map.get(room_id):
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if room_id in partial_state_rooms:
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continue
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all_rooms.add(room_id)
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@ -1382,6 +1382,30 @@ class RoomWorkerStore(CacheInvalidationWorkerStore):
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partial_state_rooms = {row[0] for row in rows}
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return {room_id: room_id in partial_state_rooms for room_id in room_ids}
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@cached(max_entries=10000, iterable=True)
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async def get_partial_rooms(self) -> AbstractSet[str]:
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"""Get any "partial-state" rooms which the user is in.
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This is fast as the set of partially stated rooms at any point across
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the whole server is small, and so such a query is fast. This is also
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faster than looking up whether a set of room ID's are partially stated
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via `is_partial_state_room_batched(...)` because of the sheer amount of
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CPU time looking all the rooms up in the cache.
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"""
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def _get_partial_rooms_for_user_txn(
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txn: LoggingTransaction,
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) -> AbstractSet[str]:
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sql = """
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SELECT room_id FROM partial_state_rooms
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"""
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txn.execute(sql)
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return {room_id for (room_id,) in txn}
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return await self.db_pool.runInteraction(
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"get_partial_rooms_for_user", _get_partial_rooms_for_user_txn
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)
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async def get_join_event_id_and_device_lists_stream_id_for_partial_state(
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self, room_id: str
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) -> Tuple[str, int]:
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@ -2341,6 +2365,7 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
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self._invalidate_cache_and_stream(
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txn, self._get_partial_state_servers_at_join, (room_id,)
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)
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self._invalidate_all_cache_and_stream(txn, self.get_partial_rooms)
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async def write_partial_state_rooms_join_event_id(
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self,
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@ -2562,6 +2587,7 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
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self._invalidate_cache_and_stream(
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txn, self._get_partial_state_servers_at_join, (room_id,)
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)
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self._invalidate_all_cache_and_stream(txn, self.get_partial_rooms)
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DatabasePool.simple_insert_txn(
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txn,
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