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Deduplicate device updates sent over replication

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We currently send several kHz of device list updates over replication
occisonally, which often causes the replications streams to lag and then
get dropped.

A lot of those updates will actually be duplicates, since we don't send
e.g. device_ids across replication, so let's deduplicate it when we pull
them out of the database.
This commit is contained in:
Erik Johnston 2018-10-29 17:34:34 +00:00
parent a163b748a5
commit 88e5ffe6fe
1 changed files with 5 additions and 1 deletions
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6
synapse/storage/devices.py
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@ -589,10 +589,14 @@ class DeviceStore(SQLBaseStore):
combined list of changes to devices, and which destinations need to be
poked. `destination` may be None if no destinations need to be poked.
"""
# We do a group by here as there can be a large number of duplicate
# entries, since we throw away device IDs.
sql = """
SELECT stream_id, user_id, destination FROM device_lists_stream
SELECT MAX(stream_id) AS stream_id, user_id, destination
FROM device_lists_stream
LEFT JOIN device_lists_outbound_pokes USING (stream_id, user_id, device_id)
WHERE ? < stream_id AND stream_id <= ?
GROUP BY user_id, destination
"""
return self._execute(
"get_all_device_list_changes_for_remotes", None,