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Revert "Add experimental support for sharding event persister. (#8170)" (#8242) 

* Revert "Add experimental support for sharding event persister. (#8170)"

This reverts commit 82c1ee1c22.

* Changelog
This commit is contained in:
Brendan Abolivier 2020-09-04 10:19:42 +01:00 committed by GitHub
parent be16ee59a8
commit 9f8abdcc38
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
19 changed files with 78 additions and 206 deletions
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1
changelog.d/8170.feature
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@ -1 +0,0 @@
Add experimental support for sharding event persister.

1
changelog.d/8242.feature Normal file
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@ -0,0 +1 @@
Back out experimental support for sharding event persister. **PLEASE REMOVE THIS LINE FROM THE FINAL CHANGELOG**

21
synapse/config/_base.py
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@ -832,26 +832,11 @@ class ShardedWorkerHandlingConfig:
def should_handle(self, instance_name: str, key: str) -> bool:
"""Whether this instance is responsible for handling the given key.
"""
# If multiple instances are not defined we always return true
# If multiple instances are not defined we always return true.
if not self.instances or len(self.instances) == 1:
return True
return self.get_instance(key) == instance_name
def get_instance(self, key: str) -> str:
"""Get the instance responsible for handling the given key.
Note: For things like federation sending the config for which instance
is sending is known only to the sender instance if there is only one.
Therefore `should_handle` should be used where possible.
"""
if not self.instances:
return "master"
if len(self.instances) == 1:
return self.instances[0]
# We shard by taking the hash, modulo it by the number of instances and
# then checking whether this instance matches the instance at that
# index.
@ -861,7 +846,7 @@ class ShardedWorkerHandlingConfig:
dest_hash = sha256(key.encode("utf8")).digest()
dest_int = int.from_bytes(dest_hash, byteorder="little")
remainder = dest_int % (len(self.instances))
return self.instances[remainder]
return self.instances[remainder] == instance_name
__all__ = ["Config", "RootConfig", "ShardedWorkerHandlingConfig"]

1
synapse/config/_base.pyi
View File

@ -142,4 +142,3 @@ class ShardedWorkerHandlingConfig:
instances: List[str]
def __init__(self, instances: List[str]) -> None: ...
def should_handle(self, instance_name: str, key: str) -> bool: ...
def get_instance(self, key: str) -> str: ...

27
synapse/config/workers.py
View File

@ -13,24 +13,12 @@
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import List, Union
import attr
from ._base import Config, ConfigError, ShardedWorkerHandlingConfig
from .server import ListenerConfig, parse_listener_def
def _instance_to_list_converter(obj: Union[str, List[str]]) -> List[str]:
"""Helper for allowing parsing a string or list of strings to a config
option expecting a list of strings.
"""
if isinstance(obj, str):
return [obj]
return obj
@attr.s
class InstanceLocationConfig:
"""The host and port to talk to an instance via HTTP replication.
@ -45,13 +33,11 @@ class WriterLocations:
"""Specifies the instances that write various streams.
Attributes:
events: The instances that write to the event and backfill streams.
typing: The instance that writes to the typing stream.
events: The instance that writes to the event and backfill streams.
events: The instance that writes to the typing stream.
"""
events = attr.ib(
default=["master"], type=List[str], converter=_instance_to_list_converter
)
events = attr.ib(default="master", type=str)
typing = attr.ib(default="master", type=str)
@ -119,19 +105,16 @@ class WorkerConfig(Config):
writers = config.get("stream_writers") or {}
self.writers = WriterLocations(**writers)
# Check that the configured writers for events and typing also appears in
# Check that the configured writer for events and typing also appears in
# `instance_map`.
for stream in ("events", "typing"):
instances = _instance_to_list_converter(getattr(self.writers, stream))
for instance in instances:
instance = getattr(self.writers, stream)
if instance != "master" and instance not in self.instance_map:
raise ConfigError(
"Instance %r is configured to write %s but does not appear in `instance_map` config."
% (instance, stream)
)
self.events_shard_config = ShardedWorkerHandlingConfig(self.writers.events)
def generate_config_section(self, config_dir_path, server_name, **kwargs):
return """\
## Workers ##

44
synapse/handlers/federation.py
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@ -923,8 +923,7 @@ class FederationHandler(BaseHandler):
)
)
if ev_infos:
await self._handle_new_events(dest, room_id, ev_infos, backfilled=True)
await self._handle_new_events(dest, ev_infos, backfilled=True)
# Step 2: Persist the rest of the events in the chunk one by one
events.sort(key=lambda e: e.depth)
@ -1217,7 +1216,7 @@ class FederationHandler(BaseHandler):
event_infos.append(_NewEventInfo(event, None, auth))
await self._handle_new_events(
destination, room_id, event_infos,
destination, event_infos,
)
def _sanity_check_event(self, ev):
@ -1364,15 +1363,15 @@ class FederationHandler(BaseHandler):
)
max_stream_id = await self._persist_auth_tree(
origin, room_id, auth_chain, state, event, room_version_obj
origin, auth_chain, state, event, room_version_obj
)
# We wait here until this instance has seen the events come down
# replication (if we're using replication) as the below uses caches.
#
# TODO: Currently the events stream is written to from master
await self._replication.wait_for_stream_position(
self.config.worker.events_shard_config.get_instance(room_id),
"events",
max_stream_id,
self.config.worker.writers.events, "events", max_stream_id
)
# Check whether this room is the result of an upgrade of a room we already know
@ -1626,7 +1625,7 @@ class FederationHandler(BaseHandler):
)
context = await self.state_handler.compute_event_context(event)
await self.persist_events_and_notify(event.room_id, [(event, context)])
await self.persist_events_and_notify([(event, context)])
return event
@ -1653,9 +1652,7 @@ class FederationHandler(BaseHandler):
await self.federation_client.send_leave(host_list, event)
context = await self.state_handler.compute_event_context(event)
stream_id = await self.persist_events_and_notify(
event.room_id, [(event, context)]
)
stream_id = await self.persist_events_and_notify([(event, context)])
return event, stream_id
@ -1903,7 +1900,7 @@ class FederationHandler(BaseHandler):
)
await self.persist_events_and_notify(
event.room_id, [(event, context)], backfilled=backfilled
[(event, context)], backfilled=backfilled
)
except Exception:
run_in_background(
@ -1916,7 +1913,6 @@ class FederationHandler(BaseHandler):
async def _handle_new_events(
self,
origin: str,
room_id: str,
event_infos: Iterable[_NewEventInfo],
backfilled: bool = False,
) -> None:
@ -1948,7 +1944,6 @@ class FederationHandler(BaseHandler):
)
await self.persist_events_and_notify(
room_id,
[
(ev_info.event, context)
for ev_info, context in zip(event_infos, contexts)
@ -1959,7 +1954,6 @@ class FederationHandler(BaseHandler):
async def _persist_auth_tree(
self,
origin: str,
room_id: str,
auth_events: List[EventBase],
state: List[EventBase],
event: EventBase,
@ -1974,7 +1968,6 @@ class FederationHandler(BaseHandler):
Args:
origin: Where the events came from
room_id,
auth_events
state
event
@ -2049,20 +2042,17 @@ class FederationHandler(BaseHandler):
events_to_context[e.event_id].rejected = RejectedReason.AUTH_ERROR
await self.persist_events_and_notify(
room_id,
[
(e, events_to_context[e.event_id])
for e in itertools.chain(auth_events, state)
],
]
)
new_event_context = await self.state_handler.compute_event_context(
event, old_state=state
)
return await self.persist_events_and_notify(
room_id, [(event, new_event_context)]
)
return await self.persist_events_and_notify([(event, new_event_context)])
async def _prep_event(
self,
@ -2913,7 +2903,6 @@ class FederationHandler(BaseHandler):
async def persist_events_and_notify(
self,
room_id: str,
event_and_contexts: Sequence[Tuple[EventBase, EventContext]],
backfilled: bool = False,
) -> int:
@ -2921,19 +2910,14 @@ class FederationHandler(BaseHandler):
necessary.
Args:
room_id: The room ID of events being persisted.
event_and_contexts: Sequence of events with their associated
context that should be persisted. All events must belong to
the same room.
event_and_contexts:
backfilled: Whether these events are a result of
backfilling or not
"""
instance = self.config.worker.events_shard_config.get_instance(room_id)
if instance != self._instance_name:
if self.config.worker.writers.events != self._instance_name:
result = await self._send_events(
instance_name=instance,
instance_name=self.config.worker.writers.events,
store=self.store,
room_id=room_id,
event_and_contexts=event_and_contexts,
backfilled=backfilled,
)

14
synapse/handlers/message.py
View File

@ -376,8 +376,9 @@ class EventCreationHandler(object):
self.notifier = hs.get_notifier()
self.config = hs.config
self.require_membership_for_aliases = hs.config.require_membership_for_aliases
self._events_shard_config = self.config.worker.events_shard_config
self._instance_name = hs.get_instance_name()
self._is_event_writer = (
self.config.worker.writers.events == hs.get_instance_name()
)
self.room_invite_state_types = self.hs.config.room_invite_state_types
@ -903,10 +904,9 @@ class EventCreationHandler(object):
try:
# If we're a worker we need to hit out to the master.
writer_instance = self._events_shard_config.get_instance(event.room_id)
if writer_instance != self._instance_name:
if not self._is_event_writer:
result = await self.send_event(
instance_name=writer_instance,
instance_name=self.config.worker.writers.events,
event_id=event.event_id,
store=self.store,
requester=requester,
@ -974,9 +974,7 @@ class EventCreationHandler(object):
This should only be run on the instance in charge of persisting events.
"""
assert self._events_shard_config.should_handle(
self._instance_name, event.room_id
)
assert self._is_event_writer
if ratelimit:
# We check if this is a room admin redacting an event so that we

14
synapse/handlers/room.py
View File

@ -804,9 +804,7 @@ class RoomCreationHandler(BaseHandler):
# Always wait for room creation to progate before returning
await self._replication.wait_for_stream_position(
self.hs.config.worker.events_shard_config.get_instance(room_id),
"events",
last_stream_id,
self.hs.config.worker.writers.events, "events", last_stream_id
)
return result, last_stream_id
@ -1262,10 +1260,10 @@ class RoomShutdownHandler(object):
# We now wait for the create room to come back in via replication so
# that we can assume that all the joins/invites have propogated before
# we try and auto join below.
#
# TODO: Currently the events stream is written to from master
await self._replication.wait_for_stream_position(
self.hs.config.worker.events_shard_config.get_instance(new_room_id),
"events",
stream_id,
self.hs.config.worker.writers.events, "events", stream_id
)
else:
new_room_id = None
@ -1295,9 +1293,7 @@ class RoomShutdownHandler(object):
# Wait for leave to come in over replication before trying to forget.
await self._replication.wait_for_stream_position(
self.hs.config.worker.events_shard_config.get_instance(room_id),
"events",
stream_id,
self.hs.config.worker.writers.events, "events", stream_id
)
await self.room_member_handler.forget(target_requester.user, room_id)

7
synapse/handlers/room_member.py
View File

@ -82,6 +82,13 @@ class RoomMemberHandler(object):
self._enable_lookup = hs.config.enable_3pid_lookup
self.allow_per_room_profiles = self.config.allow_per_room_profiles
self._event_stream_writer_instance = hs.config.worker.writers.events
self._is_on_event_persistence_instance = (
self._event_stream_writer_instance == hs.get_instance_name()
)
if self._is_on_event_persistence_instance:
self.persist_event_storage = hs.get_storage().persistence
self._join_rate_limiter_local = Ratelimiter(
clock=self.clock,
rate_hz=hs.config.ratelimiting.rc_joins_local.per_second,

12
synapse/replication/http/federation.py
View File

@ -65,11 +65,10 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
self.federation_handler = hs.get_handlers().federation_handler
@staticmethod
async def _serialize_payload(store, room_id, event_and_contexts, backfilled):
async def _serialize_payload(store, event_and_contexts, backfilled):
"""
Args:
store
room_id (str)
event_and_contexts (list[tuple[FrozenEvent, EventContext]])
backfilled (bool): Whether or not the events are the result of
backfilling
@ -89,11 +88,7 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
}
)
payload = {
"events": event_payloads,
"backfilled": backfilled,
"room_id": room_id,
}
payload = {"events": event_payloads, "backfilled": backfilled}
return payload
@ -101,7 +96,6 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
with Measure(self.clock, "repl_fed_send_events_parse"):
content = parse_json_object_from_request(request)
room_id = content["room_id"]
backfilled = content["backfilled"]
event_payloads = content["events"]
@ -126,7 +120,7 @@ class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
logger.info("Got %d events from federation", len(event_and_contexts))
max_stream_id = await self.federation_handler.persist_events_and_notify(
room_id, event_and_contexts, backfilled
event_and_contexts, backfilled
)
return 200, {"max_stream_id": max_stream_id}

2
synapse/replication/tcp/handler.py
View File

@ -109,7 +109,7 @@ class ReplicationCommandHandler:
if isinstance(stream, (EventsStream, BackfillStream)):
# Only add EventStream and BackfillStream as a source on the
# instance in charge of event persistence.
if hs.get_instance_name() in hs.config.worker.writers.events:
if hs.config.worker.writers.events == hs.get_instance_name():
self._streams_to_replicate.append(stream)
continue

4
synapse/replication/tcp/streams/events.py
View File

@ -19,7 +19,7 @@ from typing import List, Tuple, Type
import attr
from ._base import Stream, StreamUpdateResult, Token
from ._base import Stream, StreamUpdateResult, Token, current_token_without_instance
"""Handling of the 'events' replication stream
@ -117,7 +117,7 @@ class EventsStream(Stream):
self._store = hs.get_datastore()
super().__init__(
hs.get_instance_name(),
self._store._stream_id_gen.get_current_token_for_writer,
current_token_without_instance(self._store.get_current_events_token),
self._update_function,
)

2
synapse/storage/databases/__init__.py
View File

@ -68,7 +68,7 @@ class Databases(object):
# If we're on a process that can persist events also
# instantiate a `PersistEventsStore`
if hs.get_instance_name() in hs.config.worker.writers.events:
if hs.config.worker.writers.events == hs.get_instance_name():
persist_events = PersistEventsStore(hs, database, main)
if "state" in database_config.databases:

2
synapse/storage/databases/main/event_federation.py
View File

@ -438,7 +438,7 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
"""
if stream_ordering <= self.stream_ordering_month_ago:
raise StoreError(400, "stream_ordering too old %s" % (stream_ordering,))
raise StoreError(400, "stream_ordering too old")
sql = """
SELECT event_id FROM stream_ordering_to_exterm

4
synapse/storage/databases/main/events.py
View File

@ -97,7 +97,6 @@ class PersistEventsStore:
self.store = main_data_store
self.database_engine = db.engine
self._clock = hs.get_clock()
self._instance_name = hs.get_instance_name()
self._ephemeral_messages_enabled = hs.config.enable_ephemeral_messages
self.is_mine_id = hs.is_mine_id
@ -109,7 +108,7 @@ class PersistEventsStore:
# This should only exist on instances that are configured to write
assert (
hs.get_instance_name() in hs.config.worker.writers.events
hs.config.worker.writers.events == hs.get_instance_name()
), "Can only instantiate EventsStore on master"
async def _persist_events_and_state_updates(
@ -801,7 +800,6 @@ class PersistEventsStore:
table="events",
values=[
{
"instance_name": self._instance_name,
"stream_ordering": event.internal_metadata.stream_ordering,
"topological_ordering": event.depth,
"depth": event.depth,

44
synapse/storage/databases/main/events_worker.py
View File

@ -42,8 +42,7 @@ from synapse.replication.tcp.streams import BackfillStream
from synapse.replication.tcp.streams.events import EventsStream
from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
from synapse.storage.database import DatabasePool
from synapse.storage.engines import PostgresEngine
from synapse.storage.util.id_generators import MultiWriterIdGenerator, StreamIdGenerator
from synapse.storage.util.id_generators import StreamIdGenerator
from synapse.types import Collection, get_domain_from_id
from synapse.util.caches.descriptors import Cache, cached
from synapse.util.iterutils import batch_iter
@ -79,37 +78,9 @@ class EventsWorkerStore(SQLBaseStore):
def __init__(self, database: DatabasePool, db_conn, hs):
super(EventsWorkerStore, self).__init__(database, db_conn, hs)
if isinstance(database.engine, PostgresEngine):
# If we're using Postgres than we can use `MultiWriterIdGenerator`
# regardless of whether this process writes to the streams or not.
self._stream_id_gen = MultiWriterIdGenerator(
db_conn=db_conn,
db=database,
instance_name=hs.get_instance_name(),
table="events",
instance_column="instance_name",
id_column="stream_ordering",
sequence_name="events_stream_seq",
)
self._backfill_id_gen = MultiWriterIdGenerator(
db_conn=db_conn,
db=database,
instance_name=hs.get_instance_name(),
table="events",
instance_column="instance_name",
id_column="stream_ordering",
sequence_name="events_backfill_stream_seq",
positive=False,
)
else:
# We shouldn't be running in worker mode with SQLite, but its useful
# to support it for unit tests.
#
# If this process is the writer than we need to use
# `StreamIdGenerator`, otherwise we use `SlavedIdTracker` which gets
# updated over replication. (Multiple writers are not supported for
# SQLite).
if hs.get_instance_name() in hs.config.worker.writers.events:
if hs.config.worker.writers.events == hs.get_instance_name():
# We are the process in charge of generating stream ids for events,
# so instantiate ID generators based on the database
self._stream_id_gen = StreamIdGenerator(
db_conn, "events", "stream_ordering",
)
@ -121,9 +92,10 @@ class EventsWorkerStore(SQLBaseStore):
extra_tables=[("ex_outlier_stream", "event_stream_ordering")],
)
else:
self._stream_id_gen = SlavedIdTracker(
db_conn, "events", "stream_ordering"
)
# Another process is in charge of persisting events and generating
# stream IDs: rely on the replication streams to let us know which
# IDs we can process.
self._stream_id_gen = SlavedIdTracker(db_conn, "events", "stream_ordering")
self._backfill_id_gen = SlavedIdTracker(
db_conn, "events", "stream_ordering", step=-1
)

16
synapse/storage/databases/main/schema/delta/58/14events_instance_name.sql
View File

@ -1,16 +0,0 @@
/* Copyright 2020 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.
*/
ALTER TABLE events ADD COLUMN instance_name TEXT;

26
synapse/storage/databases/main/schema/delta/58/14events_instance_name.sql.postgres
View File

@ -1,26 +0,0 @@
/* Copyright 2020 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 events_stream_seq;
SELECT setval('events_stream_seq', (
SELECT COALESCE(MAX(stream_ordering), 1) FROM events
));
CREATE SEQUENCE IF NOT EXISTS events_backfill_stream_seq;
SELECT setval('events_backfill_stream_seq', (
SELECT COALESCE(-MIN(stream_ordering), 1) FROM events
));

10
synapse/storage/util/id_generators.py
View File

@ -231,12 +231,8 @@ class MultiWriterIdGenerator:
# gaps should be relatively rare it's still worth doing the book keeping
# that allows us to skip forwards when there are gapless runs of
# positions.
#
# We start at 1 here as a) the first generated stream ID will be 2, and
# b) other parts of the code assume that stream IDs are strictly greater
# than 0.
self._persisted_upto_position = (
min(self._current_positions.values()) if self._current_positions else 1
min(self._current_positions.values()) if self._current_positions else 0
)
self._known_persisted_positions = [] # type: List[int]
@ -366,7 +362,9 @@ class MultiWriterIdGenerator:
equal to it have been successfully persisted.
"""
return self.get_persisted_upto_position()
# Currently we don't support this operation, as it's not obvious how to
# condense the stream positions of multiple writers into a single int.
raise NotImplementedError()
def get_current_token_for_writer(self, instance_name: str) -> int:
"""Returns the position of the given writer.