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authorErik Johnston <erik@matrix.org>2023-08-23 09:23:22 +0100
committerGitHub <noreply@github.com>2023-08-23 09:23:22 +0100
commit3b3fed7229c8110870aefd4de740724fc607a46c (patch)
tree893477e41cb8218b09ba1402e6990794c3b58729 /synapse/storage/schema/main
parentClean-up presence tests (#16158) (diff)
downloadsynapse-3b3fed7229c8110870aefd4de740724fc607a46c.tar.xz
Increase perf of read/write locks (#16149)
We do this by marking the tables as `UNLOGGED` in PostgreSQL.
Diffstat (limited to 'synapse/storage/schema/main')
-rw-r--r--synapse/storage/schema/main/delta/80/02_read_write_locks_unlogged.sql.postgres30
1 files changed, 30 insertions, 0 deletions
diff --git a/synapse/storage/schema/main/delta/80/02_read_write_locks_unlogged.sql.postgres b/synapse/storage/schema/main/delta/80/02_read_write_locks_unlogged.sql.postgres
new file mode 100644
index 0000000000..5b5dbf2687
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+++ b/synapse/storage/schema/main/delta/80/02_read_write_locks_unlogged.sql.postgres
@@ -0,0 +1,30 @@
+/* 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;