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Reduce to-device queries for /sync. #12163

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Mar 4, 2022
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Reduce to-device queries for /sync. #12163

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9ea29d2
Reduce to-device queries for /sync.
erikjohnston Mar 4, 2022
4145c53
Newsfile
erikjohnston Mar 4, 2022
5f3c288
Update changelog.d/12163.misc
erikjohnston Mar 4, 2022
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1 change: 1 addition & 0 deletions changelog.d/12163.misc
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Reduce number of DB queries made during processing of `/sync`.
3 changes: 3 additions & 0 deletions synapse/storage/databases/main/deviceinbox.py
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Expand Up @@ -298,6 +298,9 @@ async def _get_device_messages(
# This user has new messages sent to them. Query messages for them
user_ids_to_query.add(user_id)

if not user_ids_to_query:
return {}, to_stream_id

def get_device_messages_txn(txn: LoggingTransaction):
# Build a query to select messages from any of the given devices that
# are between the given stream id bounds.
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