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Merge pull request #4109 from matrix-org/erikj/repl_devices

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A couple of replication fixes for device lists
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Erik Johnston 2018-10-29 18:16:48 +00:00 committed by GitHub
commit 169851b412
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2 changed files with 6 additions and 1 deletions
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1
changelog.d/4109.misc Normal file
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@ -0,0 +1 @@
Reduce replication traffic for device lists

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,