From db1cfe9c80a707995fcad8f3faa839acb247068a Mon Sep 17 00:00:00 2001 From: Nick Mills-Barrett Date: Wed, 4 Jan 2023 11:49:26 +0000 Subject: [PATCH] Update all stream IDs after processing replication rows (#14723) This creates a new store method, `process_replication_position` that is called after `process_replication_rows`. By moving stream ID advances here this guarantees any relevant cache invalidations will have been applied before the stream is advanced. This avoids race conditions where Python switches between threads mid way through processing the `process_replication_rows` method where stream IDs may be advanced before caches are invalidated due to class resolution ordering. See this comment/issue for further discussion: https://github.com/matrix-org/synapse/issues/14158#issuecomment-1344048703 --- changelog.d/14723.bugfix | 1 + synapse/replication/tcp/client.py | 3 +++ synapse/storage/_base.py | 17 ++++++++++++++++- synapse/storage/databases/main/account_data.py | 14 ++++++++++---- synapse/storage/databases/main/cache.py | 11 ++++++++--- synapse/storage/databases/main/deviceinbox.py | 7 +++++++ synapse/storage/databases/main/devices.py | 11 +++++++++-- synapse/storage/databases/main/events_worker.py | 15 ++++++++++----- synapse/storage/databases/main/presence.py | 8 +++++++- synapse/storage/databases/main/push_rule.py | 7 +++++++ synapse/storage/databases/main/pusher.py | 6 +++--- synapse/storage/databases/main/receipts.py | 7 +++++++ synapse/storage/databases/main/tags.py | 8 +++++++- 13 files changed, 95 insertions(+), 20 deletions(-) create mode 100644 changelog.d/14723.bugfix diff --git a/changelog.d/14723.bugfix b/changelog.d/14723.bugfix new file mode 100644 index 000000000..e1f89cee3 --- /dev/null +++ b/changelog.d/14723.bugfix @@ -0,0 +1 @@ +Ensure stream IDs are always updated after caches get invalidated with workers. Contributed by Nick @ Beeper (@fizzadar). diff --git a/synapse/replication/tcp/client.py b/synapse/replication/tcp/client.py index 658d89210..b5e40da53 100644 --- a/synapse/replication/tcp/client.py +++ b/synapse/replication/tcp/client.py @@ -152,6 +152,9 @@ class ReplicationDataHandler: rows: a list of Stream.ROW_TYPE objects as returned by Stream.parse_row. """ self.store.process_replication_rows(stream_name, instance_name, token, rows) + # NOTE: this must be called after process_replication_rows to ensure any + # cache invalidations are first handled before any stream ID advances. + self.store.process_replication_position(stream_name, instance_name, token) if self.send_handler: await self.send_handler.process_replication_rows(stream_name, token, rows) diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py index 69abf6fa8..41d911101 100644 --- a/synapse/storage/_base.py +++ b/synapse/storage/_base.py @@ -57,7 +57,22 @@ class SQLBaseStore(metaclass=ABCMeta): token: int, rows: Iterable[Any], ) -> None: - pass + """ + Used by storage classes to invalidate caches based on incoming replication data. These + must not update any ID generators, use `process_replication_position`. + """ + + def process_replication_position( # noqa: B027 (no-op by design) + self, + stream_name: str, + instance_name: str, + token: int, + ) -> None: + """ + Used by storage classes to advance ID generators based on incoming replication data. This + is called after process_replication_rows such that caches are invalidated before any token + positions advance. + """ def _invalidate_state_caches( self, room_id: str, members_changed: Collection[str] diff --git a/synapse/storage/databases/main/account_data.py b/synapse/storage/databases/main/account_data.py index e59776f43..86032897f 100644 --- a/synapse/storage/databases/main/account_data.py +++ b/synapse/storage/databases/main/account_data.py @@ -436,10 +436,7 @@ class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore) token: int, rows: Iterable[Any], ) -> None: - if stream_name == TagAccountDataStream.NAME: - self._account_data_id_gen.advance(instance_name, token) - elif stream_name == AccountDataStream.NAME: - self._account_data_id_gen.advance(instance_name, token) + if stream_name == AccountDataStream.NAME: for row in rows: if not row.room_id: self.get_global_account_data_by_type_for_user.invalidate( @@ -454,6 +451,15 @@ class AccountDataWorkerStore(PushRulesWorkerStore, CacheInvalidationWorkerStore) super().process_replication_rows(stream_name, instance_name, token, rows) + def process_replication_position( + self, stream_name: str, instance_name: str, token: int + ) -> None: + if stream_name == TagAccountDataStream.NAME: + self._account_data_id_gen.advance(instance_name, token) + elif stream_name == AccountDataStream.NAME: + self._account_data_id_gen.advance(instance_name, token) + super().process_replication_position(stream_name, instance_name, token) + async def add_account_data_to_room( self, user_id: str, room_id: str, account_data_type: str, content: JsonDict ) -> int: diff --git a/synapse/storage/databases/main/cache.py b/synapse/storage/databases/main/cache.py index a58668a38..2179a8bf5 100644 --- a/synapse/storage/databases/main/cache.py +++ b/synapse/storage/databases/main/cache.py @@ -164,9 +164,6 @@ class CacheInvalidationWorkerStore(SQLBaseStore): backfilled=True, ) elif stream_name == CachesStream.NAME: - if self._cache_id_gen: - self._cache_id_gen.advance(instance_name, token) - for row in rows: if row.cache_func == CURRENT_STATE_CACHE_NAME: if row.keys is None: @@ -182,6 +179,14 @@ class CacheInvalidationWorkerStore(SQLBaseStore): super().process_replication_rows(stream_name, instance_name, token, rows) + def process_replication_position( + self, stream_name: str, instance_name: str, token: int + ) -> None: + if stream_name == CachesStream.NAME: + if self._cache_id_gen: + self._cache_id_gen.advance(instance_name, token) + super().process_replication_position(stream_name, instance_name, token) + def _process_event_stream_row(self, token: int, row: EventsStreamRow) -> None: data = row.data diff --git a/synapse/storage/databases/main/deviceinbox.py b/synapse/storage/databases/main/deviceinbox.py index 48a54d9cb..713be91c5 100644 --- a/synapse/storage/databases/main/deviceinbox.py +++ b/synapse/storage/databases/main/deviceinbox.py @@ -157,6 +157,13 @@ class DeviceInboxWorkerStore(SQLBaseStore): ) return super().process_replication_rows(stream_name, instance_name, token, rows) + def process_replication_position( + self, stream_name: str, instance_name: str, token: int + ) -> None: + if stream_name == ToDeviceStream.NAME: + self._device_inbox_id_gen.advance(instance_name, token) + super().process_replication_position(stream_name, instance_name, token) + def get_to_device_stream_token(self) -> int: return self._device_inbox_id_gen.get_current_token() diff --git a/synapse/storage/databases/main/devices.py b/synapse/storage/databases/main/devices.py index a5bb4d404..db877e3f1 100644 --- a/synapse/storage/databases/main/devices.py +++ b/synapse/storage/databases/main/devices.py @@ -162,14 +162,21 @@ class DeviceWorkerStore(RoomMemberWorkerStore, EndToEndKeyWorkerStore): self, stream_name: str, instance_name: str, token: int, rows: Iterable[Any] ) -> None: if stream_name == DeviceListsStream.NAME: - self._device_list_id_gen.advance(instance_name, token) self._invalidate_caches_for_devices(token, rows) elif stream_name == UserSignatureStream.NAME: - self._device_list_id_gen.advance(instance_name, token) for row in rows: self._user_signature_stream_cache.entity_has_changed(row.user_id, token) return super().process_replication_rows(stream_name, instance_name, token, rows) + def process_replication_position( + self, stream_name: str, instance_name: str, token: int + ) -> None: + if stream_name == DeviceListsStream.NAME: + self._device_list_id_gen.advance(instance_name, token) + elif stream_name == UserSignatureStream.NAME: + self._device_list_id_gen.advance(instance_name, token) + super().process_replication_position(stream_name, instance_name, token) + def _invalidate_caches_for_devices( self, token: int, rows: Iterable[DeviceListsStream.DeviceListsStreamRow] ) -> None: diff --git a/synapse/storage/databases/main/events_worker.py b/synapse/storage/databases/main/events_worker.py index 761b15a81..d150fa8a9 100644 --- a/synapse/storage/databases/main/events_worker.py +++ b/synapse/storage/databases/main/events_worker.py @@ -388,11 +388,7 @@ class EventsWorkerStore(SQLBaseStore): token: int, rows: Iterable[Any], ) -> None: - if stream_name == EventsStream.NAME: - self._stream_id_gen.advance(instance_name, token) - elif stream_name == BackfillStream.NAME: - self._backfill_id_gen.advance(instance_name, -token) - elif stream_name == UnPartialStatedEventStream.NAME: + if stream_name == UnPartialStatedEventStream.NAME: for row in rows: assert isinstance(row, UnPartialStatedEventStreamRow) @@ -405,6 +401,15 @@ class EventsWorkerStore(SQLBaseStore): super().process_replication_rows(stream_name, instance_name, token, rows) + def process_replication_position( + self, stream_name: str, instance_name: str, token: int + ) -> None: + if stream_name == EventsStream.NAME: + self._stream_id_gen.advance(instance_name, token) + elif stream_name == BackfillStream.NAME: + self._backfill_id_gen.advance(instance_name, -token) + super().process_replication_position(stream_name, instance_name, token) + async def have_censored_event(self, event_id: str) -> bool: """Check if an event has been censored, i.e. if the content of the event has been erased from the database due to a redaction. diff --git a/synapse/storage/databases/main/presence.py b/synapse/storage/databases/main/presence.py index 9769a18a9..7b6081504 100644 --- a/synapse/storage/databases/main/presence.py +++ b/synapse/storage/databases/main/presence.py @@ -439,8 +439,14 @@ class PresenceStore(PresenceBackgroundUpdateStore, CacheInvalidationWorkerStore) rows: Iterable[Any], ) -> None: if stream_name == PresenceStream.NAME: - self._presence_id_gen.advance(instance_name, token) for row in rows: self.presence_stream_cache.entity_has_changed(row.user_id, token) self._get_presence_for_user.invalidate((row.user_id,)) return super().process_replication_rows(stream_name, instance_name, token, rows) + + def process_replication_position( + self, stream_name: str, instance_name: str, token: int + ) -> None: + if stream_name == PresenceStream.NAME: + self._presence_id_gen.advance(instance_name, token) + super().process_replication_position(stream_name, instance_name, token) diff --git a/synapse/storage/databases/main/push_rule.py b/synapse/storage/databases/main/push_rule.py index d4c64c46a..d4e4b777d 100644 --- a/synapse/storage/databases/main/push_rule.py +++ b/synapse/storage/databases/main/push_rule.py @@ -154,6 +154,13 @@ class PushRulesWorkerStore( self.push_rules_stream_cache.entity_has_changed(row.user_id, token) return super().process_replication_rows(stream_name, instance_name, token, rows) + def process_replication_position( + self, stream_name: str, instance_name: str, token: int + ) -> None: + if stream_name == PushRulesStream.NAME: + self._push_rules_stream_id_gen.advance(instance_name, token) + super().process_replication_position(stream_name, instance_name, token) + @cached(max_entries=5000) async def get_push_rules_for_user(self, user_id: str) -> FilteredPushRules: rows = await self.db_pool.simple_select_list( diff --git a/synapse/storage/databases/main/pusher.py b/synapse/storage/databases/main/pusher.py index 40fd781a6..7f24a3b6e 100644 --- a/synapse/storage/databases/main/pusher.py +++ b/synapse/storage/databases/main/pusher.py @@ -111,12 +111,12 @@ class PusherWorkerStore(SQLBaseStore): def get_pushers_stream_token(self) -> int: return self._pushers_id_gen.get_current_token() - def process_replication_rows( - self, stream_name: str, instance_name: str, token: int, rows: Iterable[Any] + def process_replication_position( + self, stream_name: str, instance_name: str, token: int ) -> None: if stream_name == PushersStream.NAME: self._pushers_id_gen.advance(instance_name, token) - return super().process_replication_rows(stream_name, instance_name, token, rows) + super().process_replication_position(stream_name, instance_name, token) async def get_pushers_by_app_id_and_pushkey( self, app_id: str, pushkey: str diff --git a/synapse/storage/databases/main/receipts.py b/synapse/storage/databases/main/receipts.py index e06725f69..86f5bce5f 100644 --- a/synapse/storage/databases/main/receipts.py +++ b/synapse/storage/databases/main/receipts.py @@ -588,6 +588,13 @@ class ReceiptsWorkerStore(SQLBaseStore): return super().process_replication_rows(stream_name, instance_name, token, rows) + def process_replication_position( + self, stream_name: str, instance_name: str, token: int + ) -> None: + if stream_name == ReceiptsStream.NAME: + self._receipts_id_gen.advance(instance_name, token) + super().process_replication_position(stream_name, instance_name, token) + def _insert_linearized_receipt_txn( self, txn: LoggingTransaction, diff --git a/synapse/storage/databases/main/tags.py b/synapse/storage/databases/main/tags.py index b0f5de67a..e23c927e0 100644 --- a/synapse/storage/databases/main/tags.py +++ b/synapse/storage/databases/main/tags.py @@ -300,13 +300,19 @@ class TagsWorkerStore(AccountDataWorkerStore): rows: Iterable[Any], ) -> None: if stream_name == TagAccountDataStream.NAME: - self._account_data_id_gen.advance(instance_name, token) for row in rows: self.get_tags_for_user.invalidate((row.user_id,)) self._account_data_stream_cache.entity_has_changed(row.user_id, token) super().process_replication_rows(stream_name, instance_name, token, rows) + def process_replication_position( + self, stream_name: str, instance_name: str, token: int + ) -> None: + if stream_name == TagAccountDataStream.NAME: + self._account_data_id_gen.advance(instance_name, token) + super().process_replication_position(stream_name, instance_name, token) + class TagsStore(TagsWorkerStore): pass