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Set thread_id column to non-null for event_push_{actions,actions_staging,summary} (#15437) 

Updates the database schema to require a thread_id (by adding a
constraint that the column is non-null) for event_push_actions,
event_push_actions_staging, and event_push_actions_summary.

For PostgreSQL we add the constraint as NOT VALID, then
VALIDATE the constraint a background job to avoid locking
the table during an upgrade.

For SQLite we simply rebuild the table & copy the data.
This commit is contained in:
Patrick Cloke 2023-05-03 07:49:03 -04:00 committed by GitHub
parent 04e79e6a18
commit a7b3e9ce65
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 225 additions and 234 deletions
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1
changelog.d/15437.misc Normal file
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@ -0,0 +1 @@
Make the `thread_id` column on `event_push_actions`, `event_push_actions_staging`, and `event_push_summary` non-null.

44
synapse/storage/background_updates.py
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@ -561,6 +561,50 @@ class BackgroundUpdater:
updater, oneshot=True
)
def register_background_validate_constraint(
self, update_name: str, constraint_name: str, table: str
) -> None:
"""Helper for store classes to do a background validate constraint.
This only applies on PostgreSQL.
To use:
1. use a schema delta file to add a background update. Example:
INSERT INTO background_updates (update_name, progress_json) VALUES
('validate_my_constraint', '{}');
2. In the Store constructor, call this method
Args:
update_name: update_name to register for
constraint_name: name of constraint to validate
table: table the constraint is applied to
"""
def runner(conn: Connection) -> None:
c = conn.cursor()
sql = f"""
ALTER TABLE {table} VALIDATE CONSTRAINT {constraint_name};
"""
logger.debug("[SQL] %s", sql)
c.execute(sql)
async def updater(progress: JsonDict, batch_size: int) -> int:
assert isinstance(
self.db_pool.engine, engines.PostgresEngine
), "validate constraint background update registered for non-Postres database"
logger.info("Validating constraint %s to %s", constraint_name, table)
await self.db_pool.runWithConnection(runner)
await self._end_background_update(update_name)
return 1
self._background_update_handlers[update_name] = _BackgroundUpdateHandler(
updater, oneshot=True
)
async def create_index_in_background(
self,
index_name: str,

244
synapse/storage/databases/main/event_push_actions.py
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@ -100,7 +100,6 @@ from synapse.storage.database import (
)
from synapse.storage.databases.main.receipts import ReceiptsWorkerStore
from synapse.storage.databases.main.stream import StreamWorkerStore
from synapse.types import JsonDict
from synapse.util import json_encoder
from synapse.util.caches.descriptors import cached
@ -289,180 +288,22 @@ class EventPushActionsWorkerStore(ReceiptsWorkerStore, StreamWorkerStore, SQLBas
unique=True,
)
self.db_pool.updates.register_background_update_handler(
"event_push_backfill_thread_id",
self._background_backfill_thread_id,
self.db_pool.updates.register_background_validate_constraint(
"event_push_actions_staging_thread_id",
constraint_name="event_push_actions_staging_thread_id",
table="event_push_actions_staging",
)
# Indexes which will be used to quickly make the thread_id column non-null.
self.db_pool.updates.register_background_index_update(
"event_push_actions_thread_id_null",
index_name="event_push_actions_thread_id_null",
self.db_pool.updates.register_background_validate_constraint(
"event_push_actions_thread_id",
constraint_name="event_push_actions_thread_id",
table="event_push_actions",
columns=["thread_id"],
where_clause="thread_id IS NULL",
)
self.db_pool.updates.register_background_index_update(
"event_push_summary_thread_id_null",
index_name="event_push_summary_thread_id_null",
self.db_pool.updates.register_background_validate_constraint(
"event_push_summary_thread_id",
constraint_name="event_push_summary_thread_id",
table="event_push_summary",
columns=["thread_id"],
where_clause="thread_id IS NULL",
)
# Check ASAP (and then later, every 1s) to see if we have finished
# background updates the event_push_actions and event_push_summary tables.
self._clock.call_later(0.0, self._check_event_push_backfill_thread_id)
self._event_push_backfill_thread_id_done = False
@wrap_as_background_process("check_event_push_backfill_thread_id")
async def _check_event_push_backfill_thread_id(self) -> None:
"""
Has thread_id finished backfilling?
If not, we need to just-in-time update it so the queries work.
"""
done = await self.db_pool.updates.has_completed_background_update(
"event_push_backfill_thread_id"
)
if done:
self._event_push_backfill_thread_id_done = True
else:
# Reschedule to run.
self._clock.call_later(15.0, self._check_event_push_backfill_thread_id)
async def _background_backfill_thread_id(
self, progress: JsonDict, batch_size: int
) -> int:
"""
Fill in the thread_id field for event_push_actions and event_push_summary.
This is preparatory so that it can be made non-nullable in the future.
Because all current (null) data is done in an unthreaded manner this
simply assumes it is on the "main" timeline. Since event_push_actions
are periodically cleared it is not possible to correctly re-calculate
the thread_id.
"""
event_push_actions_done = progress.get("event_push_actions_done", False)
def add_thread_id_txn(
txn: LoggingTransaction, start_stream_ordering: int
) -> int:
sql = """
SELECT stream_ordering
FROM event_push_actions
WHERE
thread_id IS NULL
AND stream_ordering > ?
ORDER BY stream_ordering
LIMIT ?
"""
txn.execute(sql, (start_stream_ordering, batch_size))
# No more rows to process.
rows = txn.fetchall()
if not rows:
progress["event_push_actions_done"] = True
self.db_pool.updates._background_update_progress_txn(
txn, "event_push_backfill_thread_id", progress
)
return 0
# Update the thread ID for any of those rows.
max_stream_ordering = rows[-1][0]
sql = """
UPDATE event_push_actions
SET thread_id = 'main'
WHERE ? < stream_ordering AND stream_ordering <= ? AND thread_id IS NULL
"""
txn.execute(
sql,
(
start_stream_ordering,
max_stream_ordering,
),
)
# Update progress.
processed_rows = txn.rowcount
progress["max_event_push_actions_stream_ordering"] = max_stream_ordering
self.db_pool.updates._background_update_progress_txn(
txn, "event_push_backfill_thread_id", progress
)
return processed_rows
def add_thread_id_summary_txn(txn: LoggingTransaction) -> int:
min_user_id = progress.get("max_summary_user_id", "")
min_room_id = progress.get("max_summary_room_id", "")
# Slightly overcomplicated query for getting the Nth user ID / room
# ID tuple, or the last if there are less than N remaining.
sql = """
SELECT user_id, room_id FROM (
SELECT user_id, room_id FROM event_push_summary
WHERE (user_id, room_id) > (?, ?)
AND thread_id IS NULL
ORDER BY user_id, room_id
LIMIT ?
) AS e
ORDER BY user_id DESC, room_id DESC
LIMIT 1
"""
txn.execute(sql, (min_user_id, min_room_id, batch_size))
row = txn.fetchone()
if not row:
return 0
max_user_id, max_room_id = row
sql = """
UPDATE event_push_summary
SET thread_id = 'main'
WHERE
(?, ?) < (user_id, room_id) AND (user_id, room_id) <= (?, ?)
AND thread_id IS NULL
"""
txn.execute(sql, (min_user_id, min_room_id, max_user_id, max_room_id))
processed_rows = txn.rowcount
progress["max_summary_user_id"] = max_user_id
progress["max_summary_room_id"] = max_room_id
self.db_pool.updates._background_update_progress_txn(
txn, "event_push_backfill_thread_id", progress
)
return processed_rows
# First update the event_push_actions table, then the event_push_summary table.
#
# Note that the event_push_actions_staging table is ignored since it is
# assumed that items in that table will only exist for a short period of
# time.
if not event_push_actions_done:
result = await self.db_pool.runInteraction(
"event_push_backfill_thread_id",
add_thread_id_txn,
progress.get("max_event_push_actions_stream_ordering", 0),
)
else:
result = await self.db_pool.runInteraction(
"event_push_backfill_thread_id",
add_thread_id_summary_txn,
)
# Only done after the event_push_summary table is done.
if not result:
await self.db_pool.updates._end_background_update(
"event_push_backfill_thread_id"
)
return result
async def get_unread_counts_by_room_for_user(self, user_id: str) -> Dict[str, int]:
"""Get the notification count by room for a user. Only considers notifications,
not highlight or unread counts, and threads are currently aggregated under their room.
@ -711,25 +552,6 @@ class EventPushActionsWorkerStore(ReceiptsWorkerStore, StreamWorkerStore, SQLBas
(ReceiptTypes.READ, ReceiptTypes.READ_PRIVATE),
)
# First ensure that the existing rows have an updated thread_id field.
if not self._event_push_backfill_thread_id_done:
txn.execute(
"""
UPDATE event_push_summary
SET thread_id = ?
WHERE room_id = ? AND user_id = ? AND thread_id is NULL
""",
(MAIN_TIMELINE, room_id, user_id),
)
txn.execute(
"""
UPDATE event_push_actions
SET thread_id = ?
WHERE room_id = ? AND user_id = ? AND thread_id is NULL
""",
(MAIN_TIMELINE, room_id, user_id),
)
# First we pull the counts from the summary table.
#
# We check that `last_receipt_stream_ordering` matches the stream ordering of the
@ -1545,25 +1367,6 @@ class EventPushActionsWorkerStore(ReceiptsWorkerStore, StreamWorkerStore, SQLBas
(room_id, user_id, stream_ordering, *thread_args),
)
# First ensure that the existing rows have an updated thread_id field.
if not self._event_push_backfill_thread_id_done:
txn.execute(
"""
UPDATE event_push_summary
SET thread_id = ?
WHERE room_id = ? AND user_id = ? AND thread_id is NULL
""",
(MAIN_TIMELINE, room_id, user_id),
)
txn.execute(
"""
UPDATE event_push_actions
SET thread_id = ?
WHERE room_id = ? AND user_id = ? AND thread_id is NULL
""",
(MAIN_TIMELINE, room_id, user_id),
)
# Fetch the notification counts between the stream ordering of the
# latest receipt and what was previously summarised.
unread_counts = self._get_notif_unread_count_for_user_room(
@ -1698,19 +1501,6 @@ class EventPushActionsWorkerStore(ReceiptsWorkerStore, StreamWorkerStore, SQLBas
rotate_to_stream_ordering: The new maximum event stream ordering to summarise.
"""
# Ensure that any new actions have an updated thread_id.
if not self._event_push_backfill_thread_id_done:
txn.execute(
"""
UPDATE event_push_actions
SET thread_id = ?
WHERE ? < stream_ordering AND stream_ordering <= ? AND thread_id IS NULL
""",
(MAIN_TIMELINE, old_rotate_stream_ordering, rotate_to_stream_ordering),
)
# XXX Do we need to update summaries here too?
# Calculate the new counts that should be upserted into event_push_summary
sql = """
SELECT user_id, room_id, thread_id,
@ -1773,20 +1563,6 @@ class EventPushActionsWorkerStore(ReceiptsWorkerStore, StreamWorkerStore, SQLBas
logger.info("Rotating notifications, handling %d rows", len(summaries))
# Ensure that any updated threads have the proper thread_id.
if not self._event_push_backfill_thread_id_done:
txn.execute_batch(
"""
UPDATE event_push_summary
SET thread_id = ?
WHERE room_id = ? AND user_id = ? AND thread_id is NULL
""",
[
(MAIN_TIMELINE, room_id, user_id)
for user_id, room_id, _ in summaries
],
)
self.db_pool.simple_upsert_many_txn(
txn,
table="event_push_summary",

3
synapse/storage/schema/__init__.py
View File

@ -106,6 +106,9 @@ Changes in SCHEMA_VERSION = 76:
SCHEMA_COMPAT_VERSION = (
# Queries against `event_stream_ordering` columns in membership tables must
# be disambiguated.
#
# The threads_id column must written to with non-null values for the
# event_push_actions, event_push_actions_staging, and event_push_summary tables.
74
)
"""Limit on how far the synapse codebase can be rolled back without breaking db compat

28
synapse/storage/schema/main/delta/76/04thread_notifications_backfill.sql Normal file
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@ -0,0 +1,28 @@
/* 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.
*/
-- Force the background updates from 06thread_notifications.sql to run in the
-- foreground as code will now require those to be "done".
DELETE FROM background_updates WHERE update_name = 'event_push_backfill_thread_id';
-- Overwrite any null thread_id values.
UPDATE event_push_actions_staging SET thread_id = 'main' WHERE thread_id IS NULL;
UPDATE event_push_actions SET thread_id = 'main' WHERE thread_id IS NULL;
UPDATE event_push_summary SET thread_id = 'main' WHERE thread_id IS NULL;
-- Drop the background updates to calculate the indexes used to find null thread_ids.
DELETE FROM background_updates WHERE update_name = 'event_push_actions_thread_id_null';
DELETE FROM background_updates WHERE update_name = 'event_push_summary_thread_id_null';

37
synapse/storage/schema/main/delta/76/05thread_notifications_not_null.sql.postgres Normal file
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@ -0,0 +1,37 @@
/* 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.
*/
-- The thread_id columns can now be made non-nullable, this is done by using a
-- constraint (and not altering the column) to avoid taking out a full table lock.
--
-- We initially add an invalid constraint which guards against new data (this
-- doesn't lock the table).
ALTER TABLE event_push_actions_staging
ADD CONSTRAINT event_push_actions_staging_thread_id CHECK (thread_id IS NOT NULL) NOT VALID;
ALTER TABLE event_push_actions
ADD CONSTRAINT event_push_actions_thread_id CHECK (thread_id IS NOT NULL) NOT VALID;
ALTER TABLE event_push_summary
ADD CONSTRAINT event_push_summary_thread_id CHECK (thread_id IS NOT NULL) NOT VALID;
-- We then validate the constraint which doesn't need to worry about new data. It
-- only needs a SHARE UPDATE EXCLUSIVE lock but can still take a while to complete.
INSERT INTO background_updates (ordering, update_name, progress_json) VALUES
(7605, 'event_push_actions_staging_thread_id', '{}'),
(7605, 'event_push_actions_thread_id', '{}'),
(7605, 'event_push_summary_thread_id', '{}');
-- Drop the indexes used to find null thread_ids.
DROP INDEX IF EXISTS event_push_actions_thread_id_null;
DROP INDEX IF EXISTS event_push_summary_thread_id_null;

102
synapse/storage/schema/main/delta/76/05thread_notifications_not_null.sql.sqlite Normal file
View File

@ -0,0 +1,102 @@
/* 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.
*/
-- The thread_id columns can now be made non-nullable.
--
-- SQLite doesn't support modifying columns to an existing table, so it must
-- be recreated.
-- Create the new tables.
CREATE TABLE event_push_actions_staging_new (
event_id TEXT NOT NULL,
user_id TEXT NOT NULL,
actions TEXT NOT NULL,
notif SMALLINT NOT NULL,
highlight SMALLINT NOT NULL,
unread SMALLINT,
thread_id TEXT,
inserted_ts BIGINT,
CONSTRAINT event_push_actions_staging_thread_id CHECK (thread_id is NOT NULL)
);
CREATE TABLE event_push_actions_new (
room_id TEXT NOT NULL,
event_id TEXT NOT NULL,
user_id TEXT NOT NULL,
profile_tag VARCHAR(32),
actions TEXT NOT NULL,
topological_ordering BIGINT,
stream_ordering BIGINT,
notif SMALLINT,
highlight SMALLINT,
unread SMALLINT,
thread_id TEXT,
CONSTRAINT event_id_user_id_profile_tag_uniqueness UNIQUE (room_id, event_id, user_id, profile_tag),
CONSTRAINT event_push_actions_thread_id CHECK (thread_id is NOT NULL)
);
CREATE TABLE event_push_summary_new (
user_id TEXT NOT NULL,
room_id TEXT NOT NULL,
notif_count BIGINT NOT NULL,
stream_ordering BIGINT NOT NULL,
unread_count BIGINT,
last_receipt_stream_ordering BIGINT,
thread_id TEXT,
CONSTRAINT event_push_summary_thread_id CHECK (thread_id is NOT NULL)
);
-- Copy the data.
INSERT INTO event_push_actions_staging_new (event_id, user_id, actions, notif, highlight, unread, thread_id, inserted_ts)
SELECT event_id, user_id, actions, notif, highlight, unread, thread_id, inserted_ts
FROM event_push_actions_staging;
INSERT INTO event_push_actions_new (room_id, event_id, user_id, profile_tag, actions, topological_ordering, stream_ordering, notif, highlight, unread, thread_id)
SELECT room_id, event_id, user_id, profile_tag, actions, topological_ordering, stream_ordering, notif, highlight, unread, thread_id
FROM event_push_actions;
INSERT INTO event_push_summary_new (user_id, room_id, notif_count, stream_ordering, unread_count, last_receipt_stream_ordering, thread_id)
SELECT user_id, room_id, notif_count, stream_ordering, unread_count, last_receipt_stream_ordering, thread_id
FROM event_push_summary;
-- Drop the old tables.
DROP TABLE event_push_actions_staging;
DROP TABLE event_push_actions;
DROP TABLE event_push_summary;
-- Rename the tables.
ALTER TABLE event_push_actions_staging_new RENAME TO event_push_actions_staging;
ALTER TABLE event_push_actions_new RENAME TO event_push_actions;
ALTER TABLE event_push_summary_new RENAME TO event_push_summary;
-- Recreate the indexes.
CREATE INDEX event_push_actions_staging_id ON event_push_actions_staging(event_id);
CREATE INDEX event_push_actions_highlights_index ON event_push_actions (user_id, room_id, topological_ordering, stream_ordering);
CREATE INDEX event_push_actions_rm_tokens on event_push_actions( user_id, room_id, topological_ordering, stream_ordering );
CREATE INDEX event_push_actions_room_id_user_id on event_push_actions(room_id, user_id);
CREATE INDEX event_push_actions_stream_ordering on event_push_actions( stream_ordering, user_id );
CREATE INDEX event_push_actions_u_highlight ON event_push_actions (user_id, stream_ordering);
CREATE UNIQUE INDEX event_push_summary_unique_index2 ON event_push_summary (user_id, room_id, thread_id) ;
-- Recreate some indexes in the background, by re-running the background updates
-- from 72/02event_push_actions_index.sql and 72/06thread_notifications.sql.
INSERT INTO background_updates (ordering, update_name, progress_json) VALUES
(7403, 'event_push_summary_unique_index2', '{}')
ON CONFLICT (update_name) DO UPDATE SET progress_json = '{}';
INSERT INTO background_updates (ordering, update_name, progress_json) VALUES
(7403, 'event_push_actions_stream_highlight_index', '{}')
ON CONFLICT (update_name) DO UPDATE SET progress_json = '{}';