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Optimise calculating device_list changes in /sync. (#11974)

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For users with large accounts it is inefficient to calculate the set of
users they share a room with (and takes a lot of space in the cache).
Instead we can look at users whose devices have changed since the last
sync and check if they share a room with the syncing user.
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Erik Johnston 2022-02-15 15:01:00 +00:00 • committed by GitHub
parent bab2394aa9
commit 2b5643b3af
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4 changed files with 125 additions and 14 deletions
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66
synapse/handlers/sync.py
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@ -1289,23 +1289,54 @@ class SyncHandler:
# room with by looking at all users that have left a room plus users
# that were in a room we've left.
users_who_share_room = await self.store.get_users_who_share_room_with_user(
user_id
users_that_have_changed = set()
joined_rooms = sync_result_builder.joined_room_ids
# Step 1a, check for changes in devices of users we share a room
# with
#
# We do this in two different ways depending on what we have cached.
# If we already have a list of all the user that have changed since
# the last sync then it's likely more efficient to compare the rooms
# they're in with the rooms the syncing user is in.
#
# If we don't have that info cached then we get all the users that
# share a room with our user and check if those users have changed.
changed_users = self.store.get_cached_device_list_changes(
since_token.device_list_key
)
if changed_users is not None:
result = await self.store.get_rooms_for_users_with_stream_ordering(
changed_users
)
# Always tell the user about their own devices. We check as the user
# ID is almost certainly already included (unless they're not in any
# rooms) and taking a copy of the set is relatively expensive.
if user_id not in users_who_share_room:
users_who_share_room = set(users_who_share_room)
users_who_share_room.add(user_id)
for changed_user_id, entries in result.items():
# Check if the changed user shares any rooms with the user,
# or if the changed user is the syncing user (as we always
# want to include device list updates of their own devices).
if user_id == changed_user_id or any(
e.room_id in joined_rooms for e in entries
):
users_that_have_changed.add(changed_user_id)
else:
users_who_share_room = (
await self.store.get_users_who_share_room_with_user(user_id)
)
tracked_users = users_who_share_room
# Always tell the user about their own devices. We check as the user
# ID is almost certainly already included (unless they're not in any
# rooms) and taking a copy of the set is relatively expensive.
if user_id not in users_who_share_room:
users_who_share_room = set(users_who_share_room)
users_who_share_room.add(user_id)
# Step 1a, check for changes in devices of users we share a room with
users_that_have_changed = await self.store.get_users_whose_devices_changed(
since_token.device_list_key, tracked_users
)
tracked_users = users_who_share_room
users_that_have_changed = (
await self.store.get_users_whose_devices_changed(
since_token.device_list_key, tracked_users
)
)
# Step 1b, check for newly joined rooms
for room_id in newly_joined_rooms:
@ -1329,7 +1360,14 @@ class SyncHandler:
newly_left_users.update(left_users)
# Remove any users that we still share a room with.
newly_left_users -= users_who_share_room
left_users_rooms = (
await self.store.get_rooms_for_users_with_stream_ordering(
newly_left_users
)
)
for user_id, entries in left_users_rooms.items():
if any(e.room_id in joined_rooms for e in entries):
newly_left_users.discard(user_id)
return DeviceLists(changed=users_that_have_changed, left=newly_left_users)
else: