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Disable statement timeout whilst purging rooms (#16455)

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* Disable statement timeout whilst purging rooms

* Newsfile

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

* Note the introduction version

---------

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>
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reivilibre 2023-10-09 14:41:17 +00:00 committed by GitHub
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changelog.d/16455.bugfix Normal file
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@ -0,0 +1 @@
Prevent the purging of large rooms from timing out when Postgres is in use. The timeout which causes this issue was introduced in Synapse 1.88.0.

5
synapse/storage/databases/main/purge_events.py
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@ -89,6 +89,11 @@ class PurgeEventsStore(StateGroupWorkerStore, CacheInvalidationWorkerStore):
# furthermore, we might already have the table from a previous (failed)
# purge attempt, so let's drop the table first.
if isinstance(self.database_engine, PostgresEngine):
# Disable statement timeouts for this transaction; purging rooms can
# take a while!
txn.execute("SET LOCAL statement_timeout = 0")
txn.execute("DROP TABLE IF EXISTS events_to_purge")
txn.execute(