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Improve performance of delete device messages query (#16492)

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Mathieu Velten 2023-10-18 17:42:01 +02:00 committed by GitHub
parent 8841db4d27
commit bcff01b406
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3 changed files with 11 additions and 7 deletions
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1
changelog.d/16492.misc Normal file
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@ -0,0 +1 @@
Improve performance of delete device messages query, cf issue [16479](https://github.com/matrix-org/synapse/issues/16479).

2
synapse/handlers/device.py
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@ -592,6 +592,8 @@ class DeviceHandler(DeviceWorkerHandler):
)
# Delete device messages asynchronously and in batches using the task scheduler
# We specify an upper stream id to avoid deleting non delivered messages
# if an user re-uses a device ID.
await self._task_scheduler.schedule_task(
DELETE_DEVICE_MSGS_TASK_NAME,
resource_id=device_id,

15
synapse/storage/databases/main/deviceinbox.py
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@ -478,18 +478,19 @@ class DeviceInboxWorkerStore(SQLBaseStore):
log_kv({"message": "No changes in cache since last check"})
return 0
ROW_ID_NAME = self.database_engine.row_id_name
def delete_messages_for_device_txn(txn: LoggingTransaction) -> int:
limit_statement = "" if limit is None else f"LIMIT {limit}"
sql = f"""
DELETE FROM device_inbox WHERE {ROW_ID_NAME} IN (
SELECT {ROW_ID_NAME} FROM device_inbox
WHERE user_id = ? AND device_id = ? AND stream_id <= ?
{limit_statement}
DELETE FROM device_inbox WHERE user_id = ? AND device_id = ? AND stream_id <= (
SELECT MAX(stream_id) FROM (
SELECT stream_id FROM device_inbox
WHERE user_id = ? AND device_id = ? AND stream_id <= ?
ORDER BY stream_id
{limit_statement}
) AS q1
)
"""
txn.execute(sql, (user_id, device_id, up_to_stream_id))
txn.execute(sql, (user_id, device_id, user_id, device_id, up_to_stream_id))
return txn.rowcount
count = await self.db_pool.runInteraction(