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Remove check current state membership up to date (#13745)

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* Remove checks for membership column in current_state_events
* Add schema script to force through the
  `current_state_events_membership` background job

Contributed by Nick @ Beeper (@fizzadar).
This commit is contained in:
Nick Mills-Barrett 2022-09-12 12:58:33 +01:00 committed by GitHub
parent ebfeac7c5d
commit da41a7cd61
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3 changed files with 100 additions and 155 deletions
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1
changelog.d/13745.misc Normal file
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@ -0,0 +1 @@
Remove old queries to join room memberships to current state events. Contributed by Nick @ Beeper (@fizzadar).

110
synapse/storage/databases/main/roommember.py
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@ -32,10 +32,7 @@ import attr
from synapse.api.constants import EventTypes, Membership
from synapse.metrics import LaterGauge
from synapse.metrics.background_process_metrics import (
run_as_background_process,
wrap_as_background_process,
)
from synapse.metrics.background_process_metrics import wrap_as_background_process
from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
from synapse.storage.database import (
DatabasePool,
@ -91,16 +88,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
# at a time. Keyed by room_id.
self._joined_host_linearizer = Linearizer("_JoinedHostsCache")
# Is the current_state_events.membership up to date? Or is the
# background update still running?
self._current_state_events_membership_up_to_date = False
txn = db_conn.cursor(
txn_name="_check_safe_current_state_events_membership_updated"
)
self._check_safe_current_state_events_membership_updated_txn(txn)
txn.close()
if (
self.hs.config.worker.run_background_tasks
and self.hs.config.metrics.metrics_flags.known_servers
@ -157,34 +144,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
self._known_servers_count = max([count, 1])
return self._known_servers_count
def _check_safe_current_state_events_membership_updated_txn(
self, txn: LoggingTransaction
) -> None:
"""Checks if it is safe to assume the new current_state_events
membership column is up to date
"""
pending_update = self.db_pool.simple_select_one_txn(
txn,
table="background_updates",
keyvalues={"update_name": _CURRENT_STATE_MEMBERSHIP_UPDATE_NAME},
retcols=["update_name"],
allow_none=True,
)
self._current_state_events_membership_up_to_date = not pending_update
# If the update is still running, reschedule to run.
if pending_update:
self._clock.call_later(
15.0,
run_as_background_process,
"_check_safe_current_state_events_membership_updated",
self.db_pool.runInteraction,
"_check_safe_current_state_events_membership_updated",
self._check_safe_current_state_events_membership_updated_txn,
)
@cached(max_entries=100000, iterable=True)
async def get_users_in_room(self, room_id: str) -> List[str]:
"""
@ -212,10 +171,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
`get_current_hosts_in_room()` and so we can re-use the cache but it's
not horrible to have here either.
"""
# If we can assume current_state_events.membership is up to date
# then we can avoid a join, which is a Very Good Thing given how
# frequently this function gets called.
if self._current_state_events_membership_up_to_date:
sql = """
SELECT c.state_key FROM current_state_events as c
/* Get the depth of the event from the events table */
@ -224,19 +179,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
/* Sorted by lowest depth first */
ORDER BY e.depth ASC;
"""
else:
sql = """
SELECT c.state_key FROM room_memberships as m
/* Get the depth of the event from the events table */
INNER JOIN events AS e USING (event_id)
INNER JOIN current_state_events as c
ON m.event_id = c.event_id
AND m.room_id = c.room_id
AND m.user_id = c.state_key
WHERE c.type = 'm.room.member' AND c.room_id = ? AND m.membership = ?
/* Sorted by lowest depth first */
ORDER BY e.depth ASC;
"""
txn.execute(sql, (room_id, Membership.JOIN))
return [r[0] for r in txn]
@ -353,10 +295,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
# We do this all in one transaction to keep the cache small.
# FIXME: get rid of this when we have room_stats
# If we can assume current_state_events.membership is up to date
# then we can avoid a join, which is a Very Good Thing given how
# frequently this function gets called.
if self._current_state_events_membership_up_to_date:
# Note, rejected events will have a null membership field, so
# we we manually filter them out.
sql = """
@ -365,16 +303,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
AND membership IS NOT NULL
GROUP BY membership
"""
else:
sql = """
SELECT count(*), m.membership FROM room_memberships as m
INNER JOIN current_state_events as c
ON m.event_id = c.event_id
AND m.room_id = c.room_id
AND m.user_id = c.state_key
WHERE c.type = 'm.room.member' AND c.room_id = ?
GROUP BY m.membership
"""
txn.execute(sql, (room_id,))
res: Dict[str, MemberSummary] = {}
@ -383,7 +311,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
# we order by membership and then fairly arbitrarily by event_id so
# heroes are consistent
if self._current_state_events_membership_up_to_date:
# Note, rejected events will have a null membership field, so
# we we manually filter them out.
sql = """
@ -396,17 +323,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
event_id ASC
LIMIT ?
"""
else:
sql = """
SELECT c.state_key, m.membership, c.event_id
FROM room_memberships as m
INNER JOIN current_state_events as c USING (room_id, event_id)
WHERE c.type = 'm.room.member' AND c.room_id = ?
ORDER BY
CASE m.membership WHEN ? THEN 1 WHEN ? THEN 2 ELSE 3 END ASC,
c.event_id ASC
LIMIT ?
"""
# 6 is 5 (number of heroes) plus 1, in case one of them is the calling user.
txn.execute(sql, (room_id, Membership.JOIN, Membership.INVITE, 6))
@ -649,7 +565,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
# We use `current_state_events` here and not `local_current_membership`
# as a) this gets called with remote users and b) this only gets called
# for rooms the server is participating in.
if self._current_state_events_membership_up_to_date:
sql = """
SELECT room_id, e.instance_name, e.stream_ordering
FROM current_state_events AS c
@ -659,17 +574,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
AND c.state_key = ?
AND c.membership = ?
"""
else:
sql = """
SELECT room_id, e.instance_name, e.stream_ordering
FROM current_state_events AS c
INNER JOIN room_memberships AS m USING (room_id, event_id)
INNER JOIN events AS e USING (room_id, event_id)
WHERE
c.type = 'm.room.member'
AND c.state_key = ?
AND m.membership = ?
"""
txn.execute(sql, (user_id, Membership.JOIN))
return frozenset(
@ -707,7 +611,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
user_ids,
)
if self._current_state_events_membership_up_to_date:
sql = f"""
SELECT c.state_key, room_id, e.instance_name, e.stream_ordering
FROM current_state_events AS c
@ -717,17 +620,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
AND c.membership = ?
AND {clause}
"""
else:
sql = f"""
SELECT c.state_key, room_id, e.instance_name, e.stream_ordering
FROM current_state_events AS c
INNER JOIN room_memberships AS m USING (room_id, event_id)
INNER JOIN events AS e USING (room_id, event_id)
WHERE
c.type = 'm.room.member'
AND m.membership = ?
AND {clause}
"""
txn.execute(sql, [Membership.JOIN] + args)

52
synapse/storage/schema/main/delta/72/07force_update_current_state_events_membership.py Normal file
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@ -0,0 +1,52 @@
# Copyright 2022 Beeper
#
# 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.
"""
Forces through the `current_state_events_membership` background job so checks
for its completion can be removed.
Note the background job must still remain defined in the database class.
"""
def run_upgrade(cur, database_engine, *args, **kwargs):
cur.execute("SELECT update_name FROM background_updates")
rows = cur.fetchall()
for row in rows:
if row[0] == "current_state_events_membership":
break
# No pending background job so nothing to do here
else:
return
# Populate membership field for all current_state_events, this may take
# a while but was originally handled via a background update in 2019.
cur.execute(
"""
UPDATE current_state_events
SET membership = (
SELECT membership FROM room_memberships
WHERE event_id = current_state_events.event_id
)
"""
)
# Finally, delete the background job because we've handled it above
cur.execute(
"""
DELETE FROM background_updates
WHERE update_name = 'current_state_events_membership'
"""
)