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Remove option to skip locking of tables during emulated upserts (#14469)

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To perform an emulated upsert into a table safely, we must either:
 * lock the table,
 * be the only writer upserting into the table
 * or rely on another unique index being present.

When the 2nd or 3rd cases were applicable, we previously avoided locking
the table as an optimization. However, as seen in #14406, it is easy to
slip up when adding new schema deltas and corrupt the database.

The only time we lock when performing emulated upserts is while waiting
for background updates on postgres. On sqlite, we do no locking at all.

Let's remove the option to skip locking tables, so that we don't shoot
ourselves in the foot again.

Signed-off-by: Sean Quah <seanq@matrix.org>
This commit is contained in:
Sean Quah 2022-11-28 13:42:06 +00:00 • committed by GitHub
parent 2dad42a9fb
commit f792dd74e1
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10 changed files with 19 additions and 74 deletions
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8
synapse/storage/databases/main/account_data.py
View file

@ -449,9 +449,6 @@ class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore)
content_json = json_encoder.encode(content)
async with self._account_data_id_gen.get_next() as next_id:
# no need to lock here as room_account_data has a unique constraint
# on (user_id, room_id, account_data_type) so simple_upsert will
# retry if there is a conflict.
await self.db_pool.simple_upsert(
desc="add_room_account_data",
table="room_account_data",
@ -461,7 +458,6 @@ class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore)
"account_data_type": account_data_type,
},
values={"stream_id": next_id, "content": content_json},
lock=False,
)
self._account_data_stream_cache.entity_has_changed(user_id, next_id)
@ -517,15 +513,11 @@ class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore)
) -> None:
content_json = json_encoder.encode(content)
# no need to lock here as account_data has a unique constraint on
# (user_id, account_data_type) so simple_upsert will retry if
# there is a conflict.
self.db_pool.simple_upsert_txn(
txn,
table="account_data",
keyvalues={"user_id": user_id, "account_data_type": account_data_type},
values={"stream_id": next_id, "content": content_json},
lock=False,
)
# Ignored users get denormalized into a separate table as an optimisation.

2
synapse/storage/databases/main/appservice.py
View file

@ -451,8 +451,6 @@ class ApplicationServiceTransactionWorkerStore(
table="application_services_state",
keyvalues={"as_id": service.id},
values={f"{stream_type}_stream_id": pos},
# no need to lock when emulating upsert: as_id is a unique key
lock=False,
desc="set_appservice_stream_type_pos",
)

9
synapse/storage/databases/main/devices.py
View file

@ -1744,9 +1744,6 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
table="device_lists_remote_cache",
keyvalues={"user_id": user_id, "device_id": device_id},
values={"content": json_encoder.encode(content)},
# we don't need to lock, because we assume we are the only thread
# updating this user's devices.
lock=False,
)
txn.call_after(self._get_cached_user_device.invalidate, (user_id, device_id))
@ -1760,9 +1757,6 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
table="device_lists_remote_extremeties",
keyvalues={"user_id": user_id},
values={"stream_id": stream_id},
# again, we can assume we are the only thread updating this user's
# extremity.
lock=False,
)
async def update_remote_device_list_cache(
@ -1815,9 +1809,6 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
table="device_lists_remote_extremeties",
keyvalues={"user_id": user_id},
values={"stream_id": stream_id},
# we don't need to lock, because we can assume we are the only thread
# updating this user's extremity.
lock=False,
)
async def add_device_change_to_streams(

1
synapse/storage/databases/main/event_federation.py
View file

@ -1686,7 +1686,6 @@ class EventFederationWorkerStore(SignatureWorkerStore, EventsWorkerStore, SQLBas
},
insertion_values={},
desc="insert_insertion_extremity",
lock=False,
)
async def insert_received_event_to_staging(

6
synapse/storage/databases/main/pusher.py
View file

@ -325,14 +325,11 @@ class PusherWorkerStore(SQLBaseStore):
async def set_throttle_params(
self, pusher_id: str, room_id: str, params: ThrottleParams
) -> None:
# no need to lock because `pusher_throttle` has a primary key on
# (pusher, room_id) so simple_upsert will retry
await self.db_pool.simple_upsert(
"pusher_throttle",
{"pusher": pusher_id, "room_id": room_id},
{"last_sent_ts": params.last_sent_ts, "throttle_ms": params.throttle_ms},
desc="set_throttle_params",
lock=False,
)
async def _remove_deactivated_pushers(self, progress: dict, batch_size: int) -> int:
@ -589,8 +586,6 @@ class PusherStore(PusherWorkerStore, PusherBackgroundUpdatesStore):
device_id: Optional[str] = None,
) -> None:
async with self._pushers_id_gen.get_next() as stream_id:
# no need to lock because `pushers` has a unique key on
# (app_id, pushkey, user_name) so simple_upsert will retry
await self.db_pool.simple_upsert(
table="pushers",
keyvalues={"app_id": app_id, "pushkey": pushkey, "user_name": user_id},
@ -609,7 +604,6 @@ class PusherStore(PusherWorkerStore, PusherBackgroundUpdatesStore):
"device_id": device_id,
},
desc="add_pusher",
lock=False,
)
user_has_pusher = self.get_if_user_has_pusher.cache.get_immediate(

6
synapse/storage/databases/main/room.py
View file

@ -1847,9 +1847,6 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
"creator": room_creator,
"has_auth_chain_index": has_auth_chain_index,
},
# rooms has a unique constraint on room_id, so no need to lock when doing an
# emulated upsert.
lock=False,
)
async def store_partial_state_room(
@ -1970,9 +1967,6 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
"creator": "",
"has_auth_chain_index": has_auth_chain_index,
},
# rooms has a unique constraint on room_id, so no need to lock when doing an
# emulated upsert.
lock=False,
)
async def set_room_is_public(self, room_id: str, is_public: bool) -> None:

2
synapse/storage/databases/main/room_batch.py
View file

@ -44,6 +44,4 @@ class RoomBatchStore(SQLBaseStore):
table="event_to_state_groups",
keyvalues={"event_id": event_id},
values={"state_group": state_group_id, "event_id": event_id},
# Unique constraint on event_id so we don't have to lock
lock=False,
)

2
synapse/storage/databases/main/user_directory.py
View file

@ -481,7 +481,6 @@ class UserDirectoryBackgroundUpdateStore(StateDeltasStore):
table="user_directory",
keyvalues={"user_id": user_id},
values={"display_name": display_name, "avatar_url": avatar_url},
lock=False, # We're only inserter
)
if isinstance(self.database_engine, PostgresEngine):
@ -511,7 +510,6 @@ class UserDirectoryBackgroundUpdateStore(StateDeltasStore):
table="user_directory_search",
keyvalues={"user_id": user_id},
values={"value": value},
lock=False, # We're only inserter
)
else:
# This should be unreachable.