Avoid locking for upsert on pushers tables

* replace the upsert into deleted_pushers with an insert
* no need to lock for upsert on pusher_throttle
This commit is contained in:
Richard van der Hoff 2017-11-16 17:44:52 +00:00
parent ba05f28ae7
commit 06e5bcfc83
2 changed files with 51 additions and 5 deletions

View file

@ -244,11 +244,19 @@ class PusherStore(SQLBaseStore):
"pushers",
{"app_id": app_id, "pushkey": pushkey, "user_name": user_id}
)
self._simple_upsert_txn(
# it's possible for us to end up with duplicate rows for
# (app_id, pushkey, user_id) at different stream_ids, but that
# doesn't really matter.
self._simple_insert_txn(
txn,
"deleted_pushers",
{"app_id": app_id, "pushkey": pushkey, "user_id": user_id},
{"stream_id": stream_id},
table="deleted_pushers",
values={
"stream_id": stream_id,
"app_id": app_id,
"pushkey": pushkey,
"user_id": user_id,
},
)
with self._pushers_id_gen.get_next() as stream_id:
@ -311,9 +319,12 @@ class PusherStore(SQLBaseStore):
@defer.inlineCallbacks
def set_throttle_params(self, pusher_id, room_id, params):
# no need to lock because `pusher_throttle` has a primary key on
# (pusher, room_id) so _simple_upsert will retry
yield self._simple_upsert(
"pusher_throttle",
{"pusher": pusher_id, "room_id": room_id},
params,
desc="set_throttle_params"
desc="set_throttle_params",
lock=False,
)

View file

@ -0,0 +1,35 @@
/* Copyright 2017 New Vector Ltd
*
* 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.
*/
-- drop the unique constraint on deleted_pushers so that we can just insert
-- into it rather than upserting.
CREATE TABLE deleted_pushers2 (
stream_id BIGINT NOT NULL,
app_id TEXT NOT NULL,
pushkey TEXT NOT NULL,
user_id TEXT NOT NULL
);
INSERT INTO deleted_pushers2 (stream_id, app_id, pushkey, user_id)
SELECT stream_id, app_id, pushkey, user_id from deleted_pushers;
DROP TABLE deleted_pushers;
ALTER TABLE deleted_pushers2 RENAME TO deleted_pushers;
-- create the index after doing the inserts because that's more efficient.
-- it also means we can give it the same name as the old one without renaming.
CREATE INDEX deleted_pushers_stream_id ON deleted_pushers (stream_id);