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Fix could not serialize access due to concurrent DELETE from presence_stream (#15826)

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* Change update_presence to have a isolation level of READ_COMMITTED

* changelog
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Jason Little 2023-07-05 05:44:02 -05:00 committed by GitHub
parent 95a96b21eb
commit 4cf9f92f39
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2 changed files with 7 additions and 1 deletions
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1
changelog.d/15826.misc Normal file
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@ -0,0 +1 @@
Use lower isolation level when cleaning old presence stream data to avoid serialization errors.

7
synapse/storage/databases/main/presence.py
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@ -11,7 +11,6 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import TYPE_CHECKING, Any, Dict, Iterable, List, Optional, Tuple, cast
from synapse.api.presence import PresenceState, UserPresenceState
@ -24,6 +23,7 @@ from synapse.storage.database import (
)
from synapse.storage.databases.main.cache import CacheInvalidationWorkerStore
from synapse.storage.engines import PostgresEngine
from synapse.storage.engines._base import IsolationLevel
from synapse.storage.types import Connection
from synapse.storage.util.id_generators import (
AbstractStreamIdGenerator,
@ -115,11 +115,16 @@ class PresenceStore(PresenceBackgroundUpdateStore, CacheInvalidationWorkerStore)
)
async with stream_ordering_manager as stream_orderings:
# Run the interaction with an isolation level of READ_COMMITTED to avoid
# serialization errors(and rollbacks) in the database. This way it will
# ignore new rows during the DELETE, but will pick them up the next time
# this is run. Currently, that is between 5-60 seconds.
await self.db_pool.runInteraction(
"update_presence",
self._update_presence_txn,
stream_orderings,
presence_states,
isolation_level=IsolationLevel.READ_COMMITTED,
)
return stream_orderings[-1], self._presence_id_gen.get_current_token()