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Use READ COMMITTED isolation level when inserting read receipts (#12957)

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Nick Mills-Barrett 2022-06-09 09:44:16 +01:00 committed by GitHub
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changelog.d/12957.misc Normal file
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@ -0,0 +1 @@
Use lower isolation level when inserting read receipts to avoid serialization errors. Contributed by Nick @ Beeper.

5
synapse/storage/databases/main/receipts.py
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@ -36,6 +36,7 @@ from synapse.storage.database import (
LoggingTransaction,
)
from synapse.storage.engines import PostgresEngine
from synapse.storage.engines._base import IsolationLevel
from synapse.storage.util.id_generators import (
AbstractStreamIdTracker,
MultiWriterIdGenerator,
@ -764,6 +765,10 @@ class ReceiptsWorkerStore(SQLBaseStore):
linearized_event_id,
data,
stream_id=stream_id,
# Read committed is actually beneficial here because we check for a receipt with
# greater stream order, and checking the very latest data at select time is better
# than the data at transaction start time.
isolation_level=IsolationLevel.READ_COMMITTED,
)
# If the receipt was older than the currently persisted one, nothing to do.