From 9cae44f49e6bf4f6b8a20ab11a65da417bb1565f Mon Sep 17 00:00:00 2001 From: Sean Quah <8349537+squahtx@users.noreply.github.com> Date: Tue, 22 Nov 2022 16:46:52 +0000 Subject: Track unconverted device list outbound pokes using a position instead (#14516) When a local device list change is added to `device_lists_changes_in_room`, the `converted_to_destinations` flag is set to `FALSE` and the `_handle_new_device_update_async` background process is started. This background process looks for unconverted rows in `device_lists_changes_in_room`, copies them to `device_lists_outbound_pokes` and updates the flag. To update the `converted_to_destinations` flag, the database performs a `DELETE` and `INSERT` internally, which fragments the table. To avoid this, track unconverted rows using a `(stream ID, room ID)` position instead of the flag. From now on, the `converted_to_destinations` column indicates rows that need converting to outbound pokes, but does not indicate whether the conversion has already taken place. Closes #14037. Signed-off-by: Sean Quah --- synapse/storage/databases/main/devices.py | 107 +++++++++++++++++++----------- 1 file changed, 69 insertions(+), 38 deletions(-) (limited to 'synapse/storage/databases/main') diff --git a/synapse/storage/databases/main/devices.py b/synapse/storage/databases/main/devices.py index 57230df5ae..37629115ab 100644 --- a/synapse/storage/databases/main/devices.py +++ b/synapse/storage/databases/main/devices.py @@ -2008,27 +2008,48 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore): ) async def get_uncoverted_outbound_room_pokes( - self, limit: int = 10 + self, start_stream_id: int, start_room_id: str, limit: int = 10 ) -> List[Tuple[str, str, str, int, Optional[Dict[str, str]]]]: """Get device list changes by room that have not yet been handled and written to `device_lists_outbound_pokes`. + Args: + start_stream_id: Together with `start_room_id`, indicates the position after + which to return device list changes. + start_room_id: Together with `start_stream_id`, indicates the position after + which to return device list changes. + limit: The maximum number of device list changes to return. + Returns: - A list of user ID, device ID, room ID, stream ID and optional opentracing context. + A list of user ID, device ID, room ID, stream ID and optional opentracing + context, in order of ascending (stream ID, room ID). """ sql = """ SELECT user_id, device_id, room_id, stream_id, opentracing_context FROM device_lists_changes_in_room - WHERE NOT converted_to_destinations - ORDER BY stream_id + WHERE + (stream_id, room_id) > (?, ?) AND + stream_id <= ? AND + NOT converted_to_destinations + ORDER BY stream_id ASC, room_id ASC LIMIT ? """ def get_uncoverted_outbound_room_pokes_txn( txn: LoggingTransaction, ) -> List[Tuple[str, str, str, int, Optional[Dict[str, str]]]]: - txn.execute(sql, (limit,)) + txn.execute( + sql, + ( + start_stream_id, + start_room_id, + # Avoid returning rows if there may be uncommitted device list + # changes with smaller stream IDs. + self._device_list_id_gen.get_current_token(), + limit, + ), + ) return [ ( @@ -2050,49 +2071,25 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore): user_id: str, device_id: str, room_id: str, - stream_id: Optional[int], hosts: Collection[str], context: Optional[Dict[str, str]], ) -> None: """Queue the device update to be sent to the given set of hosts, calculated from the room ID. - - Marks the associated row in `device_lists_changes_in_room` as handled, - if `stream_id` is provided. """ + if not hosts: + return def add_device_list_outbound_pokes_txn( txn: LoggingTransaction, stream_ids: List[int] ) -> None: - if hosts: - self._add_device_outbound_poke_to_stream_txn( - txn, - user_id=user_id, - device_id=device_id, - hosts=hosts, - stream_ids=stream_ids, - context=context, - ) - - if stream_id: - self.db_pool.simple_update_txn( - txn, - table="device_lists_changes_in_room", - keyvalues={ - "user_id": user_id, - "device_id": device_id, - "stream_id": stream_id, - "room_id": room_id, - }, - updatevalues={"converted_to_destinations": True}, - ) - - if not hosts: - # If there are no hosts then we don't try and generate stream IDs. - return await self.db_pool.runInteraction( - "add_device_list_outbound_pokes", - add_device_list_outbound_pokes_txn, - [], + self._add_device_outbound_poke_to_stream_txn( + txn, + user_id=user_id, + device_id=device_id, + hosts=hosts, + stream_ids=stream_ids, + context=context, ) async with self._device_list_id_gen.get_next_mult(len(hosts)) as stream_ids: @@ -2156,3 +2153,37 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore): "get_pending_remote_device_list_updates_for_room", get_pending_remote_device_list_updates_for_room_txn, ) + + async def get_device_change_last_converted_pos(self) -> Tuple[int, str]: + """ + Get the position of the last row in `device_list_changes_in_room` that has been + converted to `device_lists_outbound_pokes`. + + Rows with a strictly greater position where `converted_to_destinations` is + `FALSE` have not been converted. + """ + + row = await self.db_pool.simple_select_one( + table="device_lists_changes_converted_stream_position", + keyvalues={}, + retcols=["stream_id", "room_id"], + desc="get_device_change_last_converted_pos", + ) + return row["stream_id"], row["room_id"] + + async def set_device_change_last_converted_pos( + self, + stream_id: int, + room_id: str, + ) -> None: + """ + Set the position of the last row in `device_list_changes_in_room` that has been + converted to `device_lists_outbound_pokes`. + """ + + await self.db_pool.simple_update_one( + table="device_lists_changes_converted_stream_position", + keyvalues={}, + updatevalues={"stream_id": stream_id, "room_id": room_id}, + desc="set_device_change_last_converted_pos", + ) -- cgit 1.4.1