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Increase perf of read/write locks (#16149)

We do this by marking the tables as `UNLOGGED` in PostgreSQL.
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Erik Johnston 2023-08-23 09:23:22 +01:00 committed by GitHub
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commit 3b3fed7229
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Increase performance of read/write locks.

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/* 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.
*/
-- Mark the worker_read_write_locks* tables as UNLOGGED, to increase
-- performance. This means that we don't replicate the tables, and they get
-- truncated on a crash. This is acceptable as a) in those cases it's likely
-- that Synapse needs to be stopped/restarted anyway, and b) the locks are
-- considered best-effort anyway.
-- We need to remove and recreate the circular foreign key references, as
-- UNLOGGED tables can't reference normal tables.
ALTER TABLE worker_read_write_locks_mode DROP CONSTRAINT IF EXISTS worker_read_write_locks_mode_foreign;
ALTER TABLE worker_read_write_locks SET UNLOGGED;
ALTER TABLE worker_read_write_locks_mode SET UNLOGGED;
ALTER TABLE worker_read_write_locks_mode ADD CONSTRAINT worker_read_write_locks_mode_foreign
FOREIGN KEY (lock_name, lock_key, token) REFERENCES worker_read_write_locks(lock_name, lock_key, token) DEFERRABLE INITIALLY DEFERRED;