Faster remote room joins: stream the un-partial-stating of events over replication. [rei:frrj/streams/unpsr] (#14545)

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reivilibre 2022-12-14 14:47:11 +00:00 committed by GitHub
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8 changed files with 204 additions and 10 deletions

1
changelog.d/14545.misc Normal file
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@ -0,0 +1 @@
Faster remote room joins: stream the un-partial-stating of events over replication.

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@ -610,6 +610,8 @@ class FederationEventHandler:
self._state_storage_controller.notify_event_un_partial_stated(
event.event_id
)
# Notify that there's a new row in the un_partial_stated_events stream.
self._notifier.notify_replication()
@trace
async def backfill(

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@ -42,7 +42,10 @@ from synapse.replication.tcp.streams._base import (
)
from synapse.replication.tcp.streams.events import EventsStream
from synapse.replication.tcp.streams.federation import FederationStream
from synapse.replication.tcp.streams.partial_state import UnPartialStatedRoomStream
from synapse.replication.tcp.streams.partial_state import (
UnPartialStatedEventStream,
UnPartialStatedRoomStream,
)
STREAMS_MAP = {
stream.NAME: stream
@ -63,6 +66,7 @@ STREAMS_MAP = {
AccountDataStream,
UserSignatureStream,
UnPartialStatedRoomStream,
UnPartialStatedEventStream,
)
}
@ -83,4 +87,5 @@ __all__ = [
"AccountDataStream",
"UserSignatureStream",
"UnPartialStatedRoomStream",
"UnPartialStatedEventStream",
]

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@ -46,3 +46,31 @@ class UnPartialStatedRoomStream(Stream):
current_token_without_instance(store.get_un_partial_stated_rooms_token),
store.get_un_partial_stated_rooms_from_stream,
)
@attr.s(slots=True, frozen=True, auto_attribs=True)
class UnPartialStatedEventStreamRow:
# ID of the event that has been un-partial-stated.
event_id: str
# True iff the rejection status of the event changed as a result of being
# un-partial-stated.
rejection_status_changed: bool
class UnPartialStatedEventStream(Stream):
"""
Stream to notify about events becoming un-partial-stated.
"""
NAME = "un_partial_stated_event"
ROW_TYPE = UnPartialStatedEventStreamRow
def __init__(self, hs: "HomeServer"):
store = hs.get_datastores().main
super().__init__(
hs.get_instance_name(),
# TODO(faster_joins, multiple writers): we need to account for instance names
current_token_without_instance(store.get_un_partial_stated_events_token),
store.get_un_partial_stated_events_from_stream,
)

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@ -70,6 +70,7 @@ from synapse.storage.database import (
from synapse.storage.engines import PostgresEngine
from synapse.storage.types import Cursor
from synapse.storage.util.id_generators import (
AbstractStreamIdGenerator,
AbstractStreamIdTracker,
MultiWriterIdGenerator,
StreamIdGenerator,
@ -292,6 +293,93 @@ class EventsWorkerStore(SQLBaseStore):
id_column="chain_id",
)
self._un_partial_stated_events_stream_id_gen: AbstractStreamIdGenerator
if isinstance(database.engine, PostgresEngine):
self._un_partial_stated_events_stream_id_gen = MultiWriterIdGenerator(
db_conn=db_conn,
db=database,
stream_name="un_partial_stated_event_stream",
instance_name=hs.get_instance_name(),
tables=[
("un_partial_stated_event_stream", "instance_name", "stream_id")
],
sequence_name="un_partial_stated_event_stream_sequence",
# TODO(faster_joins, multiple writers) Support multiple writers.
writers=["master"],
)
else:
self._un_partial_stated_events_stream_id_gen = StreamIdGenerator(
db_conn, "un_partial_stated_event_stream", "stream_id"
)
def get_un_partial_stated_events_token(self) -> int:
# TODO(faster_joins, multiple writers): This is inappropriate if there are multiple
# writers because workers that don't write often will hold all
# readers up.
return self._un_partial_stated_events_stream_id_gen.get_current_token()
async def get_un_partial_stated_events_from_stream(
self, instance_name: str, last_id: int, current_id: int, limit: int
) -> Tuple[List[Tuple[int, Tuple[str, bool]]], int, bool]:
"""Get updates for the un-partial-stated events replication stream.
Args:
instance_name: The writer we want to fetch updates from. Unused
here since there is only ever one writer.
last_id: The token to fetch updates from. Exclusive.
current_id: The token to fetch updates up to. Inclusive.
limit: The requested limit for the number of rows to return. The
function may return more or fewer rows.
Returns:
A tuple consisting of: the updates, a token to use to fetch
subsequent updates, and whether we returned fewer rows than exists
between the requested tokens due to the limit.
The token returned can be used in a subsequent call to this
function to get further updatees.
The updates are a list of 2-tuples of stream ID and the row data
"""
if last_id == current_id:
return [], current_id, False
def get_un_partial_stated_events_from_stream_txn(
txn: LoggingTransaction,
) -> Tuple[List[Tuple[int, Tuple[str, bool]]], int, bool]:
sql = """
SELECT stream_id, event_id, rejection_status_changed
FROM un_partial_stated_event_stream
WHERE ? < stream_id AND stream_id <= ? AND instance_name = ?
ORDER BY stream_id ASC
LIMIT ?
"""
txn.execute(sql, (last_id, current_id, instance_name, limit))
updates = [
(
row[0],
(
row[1],
bool(row[2]),
),
)
for row in txn
]
limited = False
upto_token = current_id
if len(updates) >= limit:
upto_token = updates[-1][0]
limited = True
return updates, upto_token, limited
return await self.db_pool.runInteraction(
"get_un_partial_stated_events_from_stream",
get_un_partial_stated_events_from_stream_txn,
)
def process_replication_rows(
self,
stream_name: str,

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@ -80,6 +80,7 @@ class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
hs: "HomeServer",
):
super().__init__(database, db_conn, hs)
self._instance_name: str = hs.get_instance_name()
async def get_room_version(self, room_id: str) -> RoomVersion:
"""Get the room_version of a given room
@ -404,18 +405,21 @@ class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
context: EventContext,
) -> None:
"""Update the state group for a partial state event"""
await self.db_pool.runInteraction(
"update_state_for_partial_state_event",
self._update_state_for_partial_state_event_txn,
event,
context,
)
async with self._un_partial_stated_events_stream_id_gen.get_next() as un_partial_state_event_stream_id:
await self.db_pool.runInteraction(
"update_state_for_partial_state_event",
self._update_state_for_partial_state_event_txn,
event,
context,
un_partial_state_event_stream_id,
)
def _update_state_for_partial_state_event_txn(
self,
txn: LoggingTransaction,
event: EventBase,
context: EventContext,
un_partial_state_event_stream_id: int,
) -> None:
# we shouldn't have any outliers here
assert not event.internal_metadata.is_outlier()
@ -436,7 +440,10 @@ class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
# the event may now be rejected where it was not before, or vice versa,
# in which case we need to update the rejected flags.
if bool(context.rejected) != (event.rejected_reason is not None):
rejection_status_changed = bool(context.rejected) != (
event.rejected_reason is not None
)
if rejection_status_changed:
self.mark_event_rejected_txn(txn, event.event_id, context.rejected)
self.db_pool.simple_delete_one_txn(
@ -445,8 +452,6 @@ class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
keyvalues={"event_id": event.event_id},
)
# TODO(faster_joins): need to do something about workers here
# https://github.com/matrix-org/synapse/issues/12994
txn.call_after(self.is_partial_state_event.invalidate, (event.event_id,))
txn.call_after(
self._get_state_group_for_event.prefill,
@ -454,6 +459,17 @@ class StateGroupWorkerStore(EventsWorkerStore, SQLBaseStore):
state_group,
)
self.db_pool.simple_insert_txn(
txn,
"un_partial_stated_event_stream",
{
"stream_id": un_partial_state_event_stream_id,
"instance_name": self._instance_name,
"event_id": event.event_id,
"rejection_status_changed": rejection_status_changed,
},
)
class MainStateBackgroundUpdateStore(RoomMemberWorkerStore):

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@ -0,0 +1,34 @@
/* Copyright 2022 The Matrix.org Foundation C.I.C
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* 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.
*/
-- Stream for notifying that an event has become un-partial-stated.
CREATE TABLE un_partial_stated_event_stream(
-- Position in the stream
stream_id BIGINT PRIMARY KEY NOT NULL,
-- Which instance wrote this entry.
instance_name TEXT NOT NULL,
-- Which event has been un-partial-stated.
event_id TEXT NOT NULL REFERENCES events(event_id) ON DELETE CASCADE,
-- true iff the `rejected` status of the event changed when it became
-- un-partial-stated.
rejection_status_changed BOOLEAN NOT NULL
);
-- We want an index here because of the foreign key constraint:
-- upon deleting an event, the database needs to be able to check here.
CREATE UNIQUE INDEX un_partial_stated_event_stream_room_id ON un_partial_stated_event_stream (event_id);

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@ -0,0 +1,20 @@
/* Copyright 2022 The Matrix.org Foundation C.I.C
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* 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.
*/
CREATE SEQUENCE IF NOT EXISTS un_partial_stated_event_stream_sequence;
SELECT setval('un_partial_stated_event_stream_sequence', (
SELECT COALESCE(MAX(stream_id), 1) FROM un_partial_stated_event_stream
));