Faster remote room joins: stream the un-partial-stating of rooms over replication. [rei:frrj/streams/unpsr] (#14473)

2 files changed, 52 insertions, 0 deletions

diff --git a/synapse/storage/schema/main/delta/73/20_un_partial_stated_room_stream.sql b/synapse/storage/schema/main/delta/73/20_un_partial_stated_room_stream.sql
new file mode 100644
index 0000000000..743196cfe3
--- /dev/null
+++ b/synapse/storage/schema/main/delta/73/20_un_partial_stated_room_stream.sql
@@ -0,0 +1,32 @@
+/* Copyright 2022 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.
+ */
+
+-- Stream for notifying that a room has become un-partial-stated.
+CREATE TABLE un_partial_stated_room_stream(
+    -- Position in the stream
+    stream_id BIGINT PRIMARY KEY NOT NULL,
+
+    -- Which instance wrote this entry.
+    instance_name TEXT NOT NULL,
+
+    -- Which room has been un-partial-stated.
+    room_id TEXT NOT NULL REFERENCES rooms(room_id) ON DELETE CASCADE
+);
+
+-- We want an index here because of the foreign key constraint:
+-- upon deleting a room, the database needs to be able to check here.
+-- This index is not unique because we can join a room multiple times in a server's lifetime,
+-- so the same room could be un-partial-stated multiple times!
+CREATE INDEX un_partial_stated_room_stream_room_id ON un_partial_stated_room_stream (room_id);
diff --git a/synapse/storage/schema/main/delta/73/21_un_partial_stated_room_stream_seq.sql.postgres b/synapse/storage/schema/main/delta/73/21_un_partial_stated_room_stream_seq.sql.postgres
new file mode 100644
index 0000000000..c1aac0b385
--- /dev/null
+++ b/synapse/storage/schema/main/delta/73/21_un_partial_stated_room_stream_seq.sql.postgres
@@ -0,0 +1,20 @@
+/* Copyright 2022 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 un_partial_stated_room_stream_sequence;
+
+SELECT setval('un_partial_stated_room_stream_sequence', (
+    SELECT COALESCE(MAX(stream_id), 1) FROM un_partial_stated_room_stream
+));