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Faster joins: omit partial rooms from eager syncs until the resync completes (#14870)

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* Allow `AbstractSet` in `StrCollection`

Or else frozensets are excluded. This will be useful in an upcoming
commit where I plan to change a function that accepts `List[str]` to
accept `StrCollection` instead.

* `rooms_to_exclude` -> `rooms_to_exclude_globally`

I am about to make use of this exclusion mechanism to exclude rooms for
a specific user and a specific sync. This rename helps to clarify the
distinction between the global config and the rooms to exclude for a
specific sync.

* Better function names for internal sync methods

* Track a list of excluded rooms on SyncResultBuilder

I plan to feed a list of partially stated rooms for this sync to ignore

* Exclude partial state rooms during eager sync

using the mechanism established in the previous commit

* Track un-partial-state stream in sync tokens

So that we can work out which rooms have become fully-stated during a
given sync period.

* Fix mutation of `@cached` return value

This was fouling up a complement test added alongside this PR.
Excluding a room would mean the set of forgotten rooms in the cache
would be extended. This means that room could be erroneously considered
forgotten in the future.

Introduced in #12310, Synapse 1.57.0. I don't think this had any
user-visible side effects (until now).

* SyncResultBuilder: track rooms to force as newly joined

Similar plan as before. We've omitted rooms from certain sync responses;
now we establish the mechanism to reintroduce them into future syncs.

* Read new field, to present rooms as newly joined

* Force un-partial-stated rooms to be newly-joined

for eager incremental syncs only, provided they're still fully stated

* Notify user stream listeners to wake up long polling syncs

* Changelog

* Typo fix

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

* Unnecessary list cast

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

* Rephrase comment

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

* Another comment

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

* Fixup merge(?)

* Poke notifier when receiving un-partial-stated msg over replication

* Fixup merge whoops

Thanks MV :)

Co-authored-by: Mathieu Velen <mathieuv@matrix.org>

Co-authored-by: Mathieu Velten <mathieuv@matrix.org>
Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>
This commit is contained in:
David Robertson 2023-01-23 15:44:39 +00:00 committed by GitHub
parent 5e75771ece
commit 80d44060c9
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13 changed files with 170 additions and 44 deletions
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1
changelog.d/14870.feature Normal file
View file

@ -0,0 +1 @@
Faster joins: allow non-lazy-loading ("eager") syncs to complete after a partial join by omitting partial state rooms until they become fully stated.

15
synapse/handlers/federation.py
View file

@ -1868,22 +1868,17 @@ class FederationHandler:
async with self._is_partial_state_room_linearizer.queue(room_id):
logger.info("Clearing partial-state flag for %s", room_id)
success = await self.store.clear_partial_state_room(room_id)
new_stream_id = await self.store.clear_partial_state_room(room_id)
# Poke the notifier so that other workers see the write to
# the un-partial-stated rooms stream.
self._notifier.notify_replication()
if success:
if new_stream_id is not None:
logger.info("State resync complete for %s", room_id)
self._storage_controllers.state.notify_room_un_partial_stated(
room_id
)
# Poke the notifier so that other workers see the write to
# the un-partial-stated rooms stream.
self._notifier.notify_replication()
await self._notifier.on_un_partial_stated_room(
room_id, new_stream_id
)
return
# we raced against more events arriving with partial state. Go round

65
synapse/handlers/sync.py
View file

@ -290,7 +290,7 @@ class SyncHandler:
expiry_ms=LAZY_LOADED_MEMBERS_CACHE_MAX_AGE,
)
self.rooms_to_exclude = hs.config.server.rooms_to_exclude_from_sync
self.rooms_to_exclude_globally = hs.config.server.rooms_to_exclude_from_sync
async def wait_for_sync_for_user(
self,
@ -1340,7 +1340,10 @@ class SyncHandler:
membership_change_events = []
if since_token:
membership_change_events = await self.store.get_membership_changes_for_user(
user_id, since_token.room_key, now_token.room_key, self.rooms_to_exclude
user_id,
since_token.room_key,
now_token.room_key,
self.rooms_to_exclude_globally,
)
mem_last_change_by_room_id: Dict[str, EventBase] = {}
@ -1375,12 +1378,39 @@ class SyncHandler:
else:
mutable_joined_room_ids.discard(room_id)
# Tweak the set of rooms to return to the client for eager (non-lazy) syncs.
mutable_rooms_to_exclude = set(self.rooms_to_exclude_globally)
if not sync_config.filter_collection.lazy_load_members():
# Non-lazy syncs should never include partially stated rooms.
# Exclude all partially stated rooms from this sync.
for room_id in mutable_joined_room_ids:
if await self.store.is_partial_state_room(room_id):
mutable_rooms_to_exclude.add(room_id)
# Incremental eager syncs should additionally include rooms that
# - we are joined to
# - are full-stated
# - became fully-stated at some point during the sync period
# (These rooms will have been omitted during a previous eager sync.)
forced_newly_joined_room_ids = set()
if since_token and not sync_config.filter_collection.lazy_load_members():
un_partial_stated_rooms = (
await self.store.get_un_partial_stated_rooms_between(
since_token.un_partial_stated_rooms_key,
now_token.un_partial_stated_rooms_key,
mutable_joined_room_ids,
)
)
for room_id in un_partial_stated_rooms:
if not await self.store.is_partial_state_room(room_id):
forced_newly_joined_room_ids.add(room_id)
# Now we have our list of joined room IDs, exclude as configured and freeze
joined_room_ids = frozenset(
(
room_id
for room_id in mutable_joined_room_ids
if room_id not in self.rooms_to_exclude
if room_id not in mutable_rooms_to_exclude
)
)
@ -1397,6 +1427,8 @@ class SyncHandler:
since_token=since_token,
now_token=now_token,
joined_room_ids=joined_room_ids,
excluded_room_ids=frozenset(mutable_rooms_to_exclude),
forced_newly_joined_room_ids=frozenset(forced_newly_joined_room_ids),
membership_change_events=membership_change_events,
)
@ -1834,14 +1866,16 @@ class SyncHandler:
# 3. Work out which rooms need reporting in the sync response.
ignored_users = await self.store.ignored_users(user_id)
if since_token:
room_changes = await self._get_rooms_changed(
room_changes = await self._get_room_changes_for_incremental_sync(
sync_result_builder, ignored_users
)
tags_by_room = await self.store.get_updated_tags(
user_id, since_token.account_data_key
)
else:
room_changes = await self._get_all_rooms(sync_result_builder, ignored_users)
room_changes = await self._get_room_changes_for_initial_sync(
sync_result_builder, ignored_users
)
tags_by_room = await self.store.get_tags_for_user(user_id)
log_kv({"rooms_changed": len(room_changes.room_entries)})
@ -1900,7 +1934,7 @@ class SyncHandler:
assert since_token
if membership_change_events:
if membership_change_events or sync_result_builder.forced_newly_joined_room_ids:
return True
stream_id = since_token.room_key.stream
@ -1909,7 +1943,7 @@ class SyncHandler:
return True
return False
async def _get_rooms_changed(
async def _get_room_changes_for_incremental_sync(
self,
sync_result_builder: "SyncResultBuilder",
ignored_users: FrozenSet[str],
@ -1947,7 +1981,9 @@ class SyncHandler:
for event in membership_change_events:
mem_change_events_by_room_id.setdefault(event.room_id, []).append(event)
newly_joined_rooms: List[str] = []
newly_joined_rooms: List[str] = list(
sync_result_builder.forced_newly_joined_room_ids
)
newly_left_rooms: List[str] = []
room_entries: List[RoomSyncResultBuilder] = []
invited: List[InvitedSyncResult] = []
@ -2153,7 +2189,7 @@ class SyncHandler:
newly_left_rooms,
)
async def _get_all_rooms(
async def _get_room_changes_for_initial_sync(
self,
sync_result_builder: "SyncResultBuilder",
ignored_users: FrozenSet[str],
@ -2178,7 +2214,7 @@ class SyncHandler:
room_list = await self.store.get_rooms_for_local_user_where_membership_is(
user_id=user_id,
membership_list=Membership.LIST,
excluded_rooms=self.rooms_to_exclude,
excluded_rooms=sync_result_builder.excluded_room_ids,
)
room_entries = []
@ -2549,6 +2585,13 @@ class SyncResultBuilder:
since_token: The token supplied by user, or None.
now_token: The token to sync up to.
joined_room_ids: List of rooms the user is joined to
excluded_room_ids: Set of room ids we should omit from the /sync response.
forced_newly_joined_room_ids:
Rooms that should be presented in the /sync response as if they were
newly joined during the sync period, even if that's not the case.
(This is useful if the room was previously excluded from a /sync response,
and now the client should be made aware of it.)
Only used by incremental syncs.
# The following mirror the fields in a sync response
presence
@ -2565,6 +2608,8 @@ class SyncResultBuilder:
since_token: Optional[StreamToken]
now_token: StreamToken
joined_room_ids: FrozenSet[str]
excluded_room_ids: FrozenSet[str]
forced_newly_joined_room_ids: FrozenSet[str]
membership_change_events: List[EventBase]
presence: List[UserPresenceState] = attr.Factory(list)

26
synapse/notifier.py
View file

@ -314,6 +314,32 @@ class Notifier:
event_entries.append((entry, event.event_id))
await self.notify_new_room_events(event_entries, max_room_stream_token)
async def on_un_partial_stated_room(
self,
room_id: str,
new_token: int,
) -> None:
"""Used by the resync background processes to wake up all listeners
of this room when it is un-partial-stated.
It will also notify replication listeners of the change in stream.
"""
# Wake up all related user stream notifiers
user_streams = self.room_to_user_streams.get(room_id, set())
time_now_ms = self.clock.time_msec()
for user_stream in user_streams:
try:
user_stream.notify(
StreamKeyType.UN_PARTIAL_STATED_ROOMS, new_token, time_now_ms
)
except Exception:
logger.exception("Failed to notify listener")
# Poke the replication so that other workers also see the write to
# the un-partial-stated rooms stream.
self.notify_replication()
async def notify_new_room_events(
self,
event_entries: List[Tuple[_PendingRoomEventEntry, str]],

1
synapse/replication/tcp/client.py
View file

@ -260,6 +260,7 @@ class ReplicationDataHandler:
self._state_storage_controller.notify_room_un_partial_stated(
row.room_id
)
await self.notifier.on_un_partial_stated_room(row.room_id, token)
elif stream_name == UnPartialStatedEventStream.NAME:
for row in rows:
assert isinstance(row, UnPartialStatedEventStreamRow)

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

@ -292,6 +292,7 @@ class RelationsWorkerStore(SQLBaseStore):
to_device_key=0,
device_list_key=0,
groups_key=0,
un_partial_stated_rooms_key=0,
)
return events[:limit], next_token

47
synapse/storage/databases/main/room.py
View file

@ -26,6 +26,7 @@ from typing import (
Mapping,
Optional,
Sequence,
Set,
Tuple,
Union,
cast,
@ -1294,10 +1295,44 @@ class RoomWorkerStore(CacheInvalidationWorkerStore):
instance_name
)
async def get_un_partial_stated_rooms_between(
self, last_id: int, current_id: int, room_ids: Collection[str]
) -> Set[str]:
"""Get all rooms that got un partial stated between `last_id` exclusive and
`current_id` inclusive.
Returns:
The list of room ids.
"""
if last_id == current_id:
return set()
def _get_un_partial_stated_rooms_between_txn(
txn: LoggingTransaction,
) -> Set[str]:
sql = """
SELECT DISTINCT room_id FROM un_partial_stated_room_stream
WHERE ? < stream_id AND stream_id <= ? AND
"""
clause, args = make_in_list_sql_clause(
self.database_engine, "room_id", room_ids
)
txn.execute(sql + clause, [last_id, current_id] + args)
return {r[0] for r in txn}
return await self.db_pool.runInteraction(
"get_un_partial_stated_rooms_between",
_get_un_partial_stated_rooms_between_txn,
)
async def get_un_partial_stated_rooms_from_stream(
self, instance_name: str, last_id: int, current_id: int, limit: int
) -> Tuple[List[Tuple[int, Tuple[str]]], int, bool]:
"""Get updates for caches replication stream.
"""Get updates for un partial stated rooms replication stream.
Args:
instance_name: The writer we want to fetch updates from. Unused
@ -2304,16 +2339,16 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
(room_id,),
)
async def clear_partial_state_room(self, room_id: str) -> bool:
async def clear_partial_state_room(self, room_id: str) -> Optional[int]:
"""Clears the partial state flag for a room.
Args:
room_id: The room whose partial state flag is to be cleared.
Returns:
`True` if the partial state flag has been cleared successfully.
The corresponding stream id for the un-partial-stated rooms stream.
`False` if the partial state flag could not be cleared because the room
`None` if the partial state flag could not be cleared because the room
still contains events with partial state.
"""
try:
@ -2324,7 +2359,7 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
room_id,
un_partial_state_room_stream_id,
)
return True
return un_partial_state_room_stream_id
except self.db_pool.engine.module.IntegrityError as e:
# Assume that any `IntegrityError`s are due to partial state events.
logger.info(
@ -2332,7 +2367,7 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
room_id,
e,
)
return False
return None
def _clear_partial_state_room_txn(
self,

19
synapse/storage/databases/main/roommember.py
View file

@ -15,6 +15,7 @@
import logging
from typing import (
TYPE_CHECKING,
AbstractSet,
Collection,
Dict,
FrozenSet,
@ -47,7 +48,13 @@ from synapse.storage.roommember import (
ProfileInfo,
RoomsForUser,
)
from synapse.types import JsonDict, PersistedEventPosition, StateMap, get_domain_from_id
from synapse.types import (
JsonDict,
PersistedEventPosition,
StateMap,
StrCollection,
get_domain_from_id,
)
from synapse.util.async_helpers import Linearizer
from synapse.util.caches import intern_string
from synapse.util.caches.descriptors import _CacheContext, cached, cachedList
@ -385,7 +392,7 @@ class RoomMemberWorkerStore(EventsWorkerStore):
self,
user_id: str,
membership_list: Collection[str],
excluded_rooms: Optional[List[str]] = None,
excluded_rooms: StrCollection = (),
) -> List[RoomsForUser]:
"""Get all the rooms for this *local* user where the membership for this user
matches one in the membership list.
@ -412,10 +419,12 @@ class RoomMemberWorkerStore(EventsWorkerStore):
)
# Now we filter out forgotten and excluded rooms
rooms_to_exclude: Set[str] = await self.get_forgotten_rooms_for_user(user_id)
rooms_to_exclude = await self.get_forgotten_rooms_for_user(user_id)
if excluded_rooms is not None:
rooms_to_exclude.update(set(excluded_rooms))
# Take a copy to avoid mutating the in-cache set
rooms_to_exclude = set(rooms_to_exclude)
rooms_to_exclude.update(excluded_rooms)
return [room for room in rooms if room.room_id not in rooms_to_exclude]
@ -1169,7 +1178,7 @@ class RoomMemberWorkerStore(EventsWorkerStore):
return count == 0
@cached()
async def get_forgotten_rooms_for_user(self, user_id: str) -> Set[str]:
async def get_forgotten_rooms_for_user(self, user_id: str) -> AbstractSet[str]:
"""Gets all rooms the user has forgotten.
Args:

6
synapse/streams/events.py
View file

@ -53,11 +53,15 @@ class EventSources:
*(attribute.type(hs) for attribute in attr.fields(_EventSourcesInner))
)
self.store = hs.get_datastores().main
self._instance_name = hs.get_instance_name()
def get_current_token(self) -> StreamToken:
push_rules_key = self.store.get_max_push_rules_stream_id()
to_device_key = self.store.get_to_device_stream_token()
device_list_key = self.store.get_device_stream_token()
un_partial_stated_rooms_key = self.store.get_un_partial_stated_rooms_token(
self._instance_name
)
token = StreamToken(
room_key=self.sources.room.get_current_key(),
@ -70,6 +74,7 @@ class EventSources:
device_list_key=device_list_key,
# Groups key is unused.
groups_key=0,
un_partial_stated_rooms_key=un_partial_stated_rooms_key,
)
return token
@ -107,5 +112,6 @@ class EventSources:
to_device_key=0,
device_list_key=0,
groups_key=0,
un_partial_stated_rooms_key=0,
)
return token

15
synapse/types/__init__.py
View file

@ -17,6 +17,7 @@ import re
import string
from typing import (
TYPE_CHECKING,
AbstractSet,
Any,
ClassVar,
Dict,
@ -79,7 +80,7 @@ JsonSerializable = object
# Collection[str] that does not include str itself; str being a Sequence[str]
# is very misleading and results in bugs.
StrCollection = Union[Tuple[str, ...], List[str], Set[str]]
StrCollection = Union[Tuple[str, ...], List[str], AbstractSet[str]]
# Note that this seems to require inheriting *directly* from Interface in order
@ -633,6 +634,7 @@ class StreamKeyType:
PUSH_RULES: Final = "push_rules_key"
TO_DEVICE: Final = "to_device_key"
DEVICE_LIST: Final = "device_list_key"
UN_PARTIAL_STATED_ROOMS = "un_partial_stated_rooms_key"
@attr.s(slots=True, frozen=True, auto_attribs=True)
@ -640,7 +642,7 @@ class StreamToken:
"""A collection of keys joined together by underscores in the following
order and which represent the position in their respective streams.
ex. `s2633508_17_338_6732159_1082514_541479_274711_265584_1`
ex. `s2633508_17_338_6732159_1082514_541479_274711_265584_1_379`
1. `room_key`: `s2633508` which is a `RoomStreamToken`
- `RoomStreamToken`'s can also look like `t426-2633508` or `m56~2.58~3.59`
- See the docstring for `RoomStreamToken` for more details.
@ -652,12 +654,13 @@ class StreamToken:
7. `to_device_key`: `274711`
8. `device_list_key`: `265584`
9. `groups_key`: `1` (note that this key is now unused)
10. `un_partial_stated_rooms_key`: `379`
You can see how many of these keys correspond to the various
fields in a "/sync" response:
```json
{
"next_batch": "s12_4_0_1_1_1_1_4_1",
"next_batch": "s12_4_0_1_1_1_1_4_1_1",
"presence": {
"events": []
},
@ -669,7 +672,7 @@ class StreamToken:
"!QrZlfIDQLNLdZHqTnt:hs1": {
"timeline": {
"events": [],
"prev_batch": "s10_4_0_1_1_1_1_4_1",
"prev_batch": "s10_4_0_1_1_1_1_4_1_1",
"limited": false
},
"state": {
@ -705,6 +708,7 @@ class StreamToken:
device_list_key: int
# Note that the groups key is no longer used and may have bogus values.
groups_key: int
un_partial_stated_rooms_key: int
_SEPARATOR = "_"
START: ClassVar["StreamToken"]
@ -743,6 +747,7 @@ class StreamToken:
# serialized so that there will not be confusion in the future
# if additional tokens are added.
str(self.groups_key),
str(self.un_partial_stated_rooms_key),
]
)
@ -775,7 +780,7 @@ class StreamToken:
return attr.evolve(self, **{key: new_value})
StreamToken.START = StreamToken(RoomStreamToken(None, 0), 0, 0, 0, 0, 0, 0, 0, 0)
StreamToken.START = StreamToken(RoomStreamToken(None, 0), 0, 0, 0, 0, 0, 0, 0, 0, 0)
@attr.s(slots=True, frozen=True, auto_attribs=True)

4
tests/rest/admin/test_room.py
View file

@ -1831,7 +1831,7 @@ class RoomMessagesTestCase(unittest.HomeserverTestCase):
def test_topo_token_is_accepted(self) -> None:
"""Test Topo Token is accepted."""
token = "t1-0_0_0_0_0_0_0_0_0"
token = "t1-0_0_0_0_0_0_0_0_0_0"
channel = self.make_request(
"GET",
"/_synapse/admin/v1/rooms/%s/messages?from=%s" % (self.room_id, token),
@ -1845,7 +1845,7 @@ class RoomMessagesTestCase(unittest.HomeserverTestCase):
def test_stream_token_is_accepted_for_fwd_pagianation(self) -> None:
"""Test that stream token is accepted for forward pagination."""
token = "s0_0_0_0_0_0_0_0_0"
token = "s0_0_0_0_0_0_0_0_0_0"
channel = self.make_request(
"GET",
"/_synapse/admin/v1/rooms/%s/messages?from=%s" % (self.room_id, token),

10
tests/rest/client/test_rooms.py
View file

@ -1987,7 +1987,7 @@ class RoomMessageListTestCase(RoomBase):
self.room_id = self.helper.create_room_as(self.user_id)
def test_topo_token_is_accepted(self) -> None:
token = "t1-0_0_0_0_0_0_0_0_0"
token = "t1-0_0_0_0_0_0_0_0_0_0"
channel = self.make_request(
"GET", "/rooms/%s/messages?access_token=x&from=%s" % (self.room_id, token)
)
@ -1998,7 +1998,7 @@ class RoomMessageListTestCase(RoomBase):
self.assertTrue("end" in channel.json_body)
def test_stream_token_is_accepted_for_fwd_pagianation(self) -> None:
token = "s0_0_0_0_0_0_0_0_0"
token = "s0_0_0_0_0_0_0_0_0_0"
channel = self.make_request(
"GET", "/rooms/%s/messages?access_token=x&from=%s" % (self.room_id, token)
)
@ -2728,7 +2728,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
"""Test that we can filter by a label on a /messages request."""
self._send_labelled_messages_in_room()
token = "s0_0_0_0_0_0_0_0_0"
token = "s0_0_0_0_0_0_0_0_0_0"
channel = self.make_request(
"GET",
"/rooms/%s/messages?access_token=%s&from=%s&filter=%s"
@ -2745,7 +2745,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
"""Test that we can filter by the absence of a label on a /messages request."""
self._send_labelled_messages_in_room()
token = "s0_0_0_0_0_0_0_0_0"
token = "s0_0_0_0_0_0_0_0_0_0"
channel = self.make_request(
"GET",
"/rooms/%s/messages?access_token=%s&from=%s&filter=%s"
@ -2768,7 +2768,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
"""
self._send_labelled_messages_in_room()
token = "s0_0_0_0_0_0_0_0_0"
token = "s0_0_0_0_0_0_0_0_0_0"
channel = self.make_request(
"GET",
"/rooms/%s/messages?access_token=%s&from=%s&filter=%s"

4
tests/rest/client/test_sync.py
View file

@ -913,7 +913,9 @@ class ExcludeRoomTestCase(unittest.HomeserverTestCase):
# We need to manually append the room ID, because we can't know the ID before
# creating the room, and we can't set the config after starting the homeserver.
self.hs.get_sync_handler().rooms_to_exclude.append(self.excluded_room_id)
self.hs.get_sync_handler().rooms_to_exclude_globally.append(
self.excluded_room_id
)
def test_join_leave(self) -> None:
"""Tests that rooms are correctly excluded from the 'join' and 'leave' sections of