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Fix a performance issue introduced in Synapse v1.83.0 which meant that purging rooms was very slow and database-intensive. (#15693)

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* Add indices required to efficiently validate new foreign key constraints on stream_ordering

* Newsfile

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>

---------

Signed-off-by: Olivier Wilkinson (reivilibre) <oliverw@matrix.org>
This commit is contained in:
reivilibre 2023-05-31 13:59:56 +00:00 committed by GitHub
parent 7477810cc2
commit 11e15d79b8
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1
changelog.d/15693.bugfix Normal file
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@ -0,0 +1 @@
Fix a performance issue introduced in Synapse v1.83.0 which meant that purging rooms was very slow and database-intensive.

31
synapse/storage/databases/state/bg_updates.py
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@ -261,6 +261,16 @@ class StateBackgroundUpdateStore(StateGroupBackgroundUpdateStore):
STATE_GROUPS_ROOM_INDEX_UPDATE_NAME = "state_groups_room_id_idx"
STATE_GROUP_EDGES_UNIQUE_INDEX_UPDATE_NAME = "state_group_edges_unique_idx"
CURRENT_STATE_EVENTS_STREAM_ORDERING_INDEX_UPDATE_NAME = (
"current_state_events_stream_ordering_idx"
)
ROOM_MEMBERSHIPS_STREAM_ORDERING_INDEX_UPDATE_NAME = (
"room_memberships_stream_ordering_idx"
)
LOCAL_CURRENT_MEMBERSHIP_STREAM_ORDERING_INDEX_UPDATE_NAME = (
"local_current_membership_stream_ordering_idx"
)
def __init__(
self,
database: DatabasePool,
@ -297,6 +307,27 @@ class StateBackgroundUpdateStore(StateGroupBackgroundUpdateStore):
replaces_index="state_group_edges_idx",
)
# These indices are needed to validate the foreign key constraint
# when events are deleted.
self.db_pool.updates.register_background_index_update(
self.CURRENT_STATE_EVENTS_STREAM_ORDERING_INDEX_UPDATE_NAME,
index_name="current_state_events_stream_ordering_idx",
table="current_state_events",
columns=["event_stream_ordering"],
)
self.db_pool.updates.register_background_index_update(
self.ROOM_MEMBERSHIPS_STREAM_ORDERING_INDEX_UPDATE_NAME,
index_name="room_memberships_stream_ordering_idx",
table="room_memberships",
columns=["event_stream_ordering"],
)
self.db_pool.updates.register_background_index_update(
self.LOCAL_CURRENT_MEMBERSHIP_STREAM_ORDERING_INDEX_UPDATE_NAME,
index_name="local_current_membership_stream_ordering_idx",
table="local_current_membership",
columns=["event_stream_ordering"],
)
async def _background_deduplicate_state(
self, progress: dict, batch_size: int
) -> int:

20
synapse/storage/schema/main/delta/77/14bg_indices_event_stream_ordering.sql Normal file
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@ -0,0 +1,20 @@
/* Copyright 2023 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.
*/
INSERT INTO background_updates (ordering, update_name, progress_json)
VALUES
(7714, 'current_state_events_stream_ordering_idx', '{}'),
(7714, 'local_current_membership_stream_ordering_idx', '{}'),
(7714, 'room_memberships_stream_ordering_idx', '{}');