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Track unconverted device list outbound pokes using a position instead (#14516)

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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 <seanq@matrix.org>
This commit is contained in:
Sean Quah 2022-11-22 16:46:52 +00:00 • committed by GitHub
parent 7eb7460042
commit 9cae44f49e
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6 changed files with 158 additions and 49 deletions
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107
synapse/storage/databases/main/devices.py
View file

@ -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",
)