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Fix get destinations to catch up query. (#9114)

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t was doing a sequential scan on `destination_rooms`, which took
minutes.
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Erik Johnston 2021-01-14 16:47:21 +00:00 committed by GitHub
parent 7036e24e98
commit 631dd06f2c
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2 changed files with 12 additions and 13 deletions
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changelog.d/9114.bugfix Normal file
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@ -0,0 +1 @@
Fix bug in federation catchup logic that caused outbound federation to be delayed for large servers after start up. Introduced in v1.21.0.

24
synapse/storage/databases/main/transactions.py
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@ -464,19 +464,17 @@ class TransactionStore(TransactionWorkerStore):
txn: LoggingTransaction, now_time_ms: int, after_destination: Optional[str]
) -> List[str]:
q = """
SELECT destination FROM destinations
WHERE destination IN (
SELECT destination FROM destination_rooms
WHERE destination_rooms.stream_ordering >
destinations.last_successful_stream_ordering
)
AND destination > ?
AND (
retry_last_ts IS NULL OR
retry_last_ts + retry_interval < ?
)
ORDER BY destination
LIMIT 25
SELECT DISTINCT destination FROM destinations
INNER JOIN destination_rooms USING (destination)
WHERE
stream_ordering > last_successful_stream_ordering
AND destination > ?
AND (
retry_last_ts IS NULL OR
retry_last_ts + retry_interval < ?
)
ORDER BY destination
LIMIT 25
"""
txn.execute(
q,