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Fix background updates failing to add unique indexes on receipts (#14453)

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As part of the database migration to support threaded receipts, there is
a possible window in between
`73/08thread_receipts_non_null.sql.postgres` removing the original
unique constraints on `receipts_linearized` and `receipts_graph` and the
`reeipts_linearized_unique_index` and `receipts_graph_unique_index`
background updates from `72/08thread_receipts.sql` completing where
the unique constraints on `receipts_linearized` and `receipts_graph` are
missing. Any emulated upserts on these tables must therefore be
performed with a lock held, otherwise duplicate rows can end up in the
tables when there are concurrent emulated upserts. Fix the missing lock.

Note that emulated upserts no longer happen by default on sqlite, since
the minimum supported version of sqlite supports native upserts by
default now.

Finally, clean up any duplicate receipts that may have crept in before
trying to create the `receipts_graph_unique_index` and
`receipts_linearized_unique_index` unique indexes.

Signed-off-by: Sean Quah <seanq@matrix.org>
This commit is contained in:
Sean Quah 2022-11-16 15:01:22 +00:00 committed by GitHub
parent d63814fd73
commit 882277008c
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3 changed files with 357 additions and 24 deletions
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1
changelog.d/14453.bugfix Normal file
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@ -0,0 +1 @@
Fix a bug introduced in Synapse 1.70.0 where the background updates to add non-thread unique indexes on receipts could fail when upgrading from 1.67.0 or earlier.

171
synapse/storage/databases/main/receipts.py
View file

@ -113,24 +113,6 @@ class ReceiptsWorkerStore(SQLBaseStore):
prefilled_cache=receipts_stream_prefill,
)
self.db_pool.updates.register_background_index_update(
"receipts_linearized_unique_index",
index_name="receipts_linearized_unique_index",
table="receipts_linearized",
columns=["room_id", "receipt_type", "user_id"],
where_clause="thread_id IS NULL",
unique=True,
)
self.db_pool.updates.register_background_index_update(
"receipts_graph_unique_index",
index_name="receipts_graph_unique_index",
table="receipts_graph",
columns=["room_id", "receipt_type", "user_id"],
where_clause="thread_id IS NULL",
unique=True,
)
def get_max_receipt_stream_id(self) -> int:
"""Get the current max stream ID for receipts stream"""
return self._receipts_id_gen.get_current_token()
@ -702,9 +684,6 @@ class ReceiptsWorkerStore(SQLBaseStore):
"data": json_encoder.encode(data),
},
where_clause=where_clause,
# receipts_linearized has a unique constraint on
# (user_id, room_id, receipt_type), so no need to lock
lock=False,
)
return rx_ts
@ -862,14 +841,13 @@ class ReceiptsWorkerStore(SQLBaseStore):
"data": json_encoder.encode(data),
},
where_clause=where_clause,
# receipts_graph has a unique constraint on
# (user_id, room_id, receipt_type), so no need to lock
lock=False,
)
class ReceiptsBackgroundUpdateStore(SQLBaseStore):
POPULATE_RECEIPT_EVENT_STREAM_ORDERING = "populate_event_stream_ordering"
RECEIPTS_LINEARIZED_UNIQUE_INDEX_UPDATE_NAME = "receipts_linearized_unique_index"
RECEIPTS_GRAPH_UNIQUE_INDEX_UPDATE_NAME = "receipts_graph_unique_index"
def __init__(
self,
@ -883,6 +861,14 @@ class ReceiptsBackgroundUpdateStore(SQLBaseStore):
self.POPULATE_RECEIPT_EVENT_STREAM_ORDERING,
self._populate_receipt_event_stream_ordering,
)
self.db_pool.updates.register_background_update_handler(
self.RECEIPTS_LINEARIZED_UNIQUE_INDEX_UPDATE_NAME,
self._background_receipts_linearized_unique_index,
)
self.db_pool.updates.register_background_update_handler(
self.RECEIPTS_GRAPH_UNIQUE_INDEX_UPDATE_NAME,
self._background_receipts_graph_unique_index,
)
async def _populate_receipt_event_stream_ordering(
self, progress: JsonDict, batch_size: int
@ -938,6 +924,143 @@ class ReceiptsBackgroundUpdateStore(SQLBaseStore):
return batch_size
async def _create_receipts_index(self, index_name: str, table: str) -> None:
"""Adds a unique index on `(room_id, receipt_type, user_id)` to the given
receipts table, for non-thread receipts."""
def _create_index(conn: LoggingDatabaseConnection) -> None:
conn.rollback()
# we have to set autocommit, because postgres refuses to
# CREATE INDEX CONCURRENTLY without it.
if isinstance(self.database_engine, PostgresEngine):
conn.set_session(autocommit=True)
try:
c = conn.cursor()
# Now that the duplicates are gone, we can create the index.
concurrently = (
"CONCURRENTLY"
if isinstance(self.database_engine, PostgresEngine)
else ""
)
sql = f"""
CREATE UNIQUE INDEX {concurrently} {index_name}
ON {table}(room_id, receipt_type, user_id)
WHERE thread_id IS NULL
"""
c.execute(sql)
finally:
if isinstance(self.database_engine, PostgresEngine):
conn.set_session(autocommit=False)
await self.db_pool.runWithConnection(_create_index)
async def _background_receipts_linearized_unique_index(
self, progress: dict, batch_size: int
) -> int:
"""Removes duplicate receipts and adds a unique index on
`(room_id, receipt_type, user_id)` to `receipts_linearized`, for non-thread
receipts."""
def _remote_duplicate_receipts_txn(txn: LoggingTransaction) -> None:
# Identify any duplicate receipts arising from
# https://github.com/matrix-org/synapse/issues/14406.
# We expect the following query to use the per-thread receipt index and take
# less than a minute.
sql = """
SELECT MAX(stream_id), room_id, receipt_type, user_id
FROM receipts_linearized
WHERE thread_id IS NULL
GROUP BY room_id, receipt_type, user_id
HAVING COUNT(*) > 1
"""
txn.execute(sql)
duplicate_keys = cast(List[Tuple[int, str, str, str]], list(txn))
# Then remove duplicate receipts, keeping the one with the highest
# `stream_id`. There should only be a single receipt with any given
# `stream_id`.
for max_stream_id, room_id, receipt_type, user_id in duplicate_keys:
sql = """
DELETE FROM receipts_linearized
WHERE
room_id = ? AND
receipt_type = ? AND
user_id = ? AND
thread_id IS NULL AND
stream_id < ?
"""
txn.execute(sql, (room_id, receipt_type, user_id, max_stream_id))
await self.db_pool.runInteraction(
self.RECEIPTS_LINEARIZED_UNIQUE_INDEX_UPDATE_NAME,
_remote_duplicate_receipts_txn,
)
await self._create_receipts_index(
"receipts_linearized_unique_index",
"receipts_linearized",
)
await self.db_pool.updates._end_background_update(
self.RECEIPTS_LINEARIZED_UNIQUE_INDEX_UPDATE_NAME
)
return 1
async def _background_receipts_graph_unique_index(
self, progress: dict, batch_size: int
) -> int:
"""Removes duplicate receipts and adds a unique index on
`(room_id, receipt_type, user_id)` to `receipts_graph`, for non-thread
receipts."""
def _remote_duplicate_receipts_txn(txn: LoggingTransaction) -> None:
# Identify any duplicate receipts arising from
# https://github.com/matrix-org/synapse/issues/14406.
# We expect the following query to use the per-thread receipt index and take
# less than a minute.
sql = """
SELECT room_id, receipt_type, user_id FROM receipts_graph
WHERE thread_id IS NULL
GROUP BY room_id, receipt_type, user_id
HAVING COUNT(*) > 1
"""
txn.execute(sql)
duplicate_keys = cast(List[Tuple[str, str, str]], list(txn))
# Then remove all duplicate receipts.
# We could be clever and try to keep the latest receipt out of every set of
# duplicates, but it's far simpler to remove them all.
for room_id, receipt_type, user_id in duplicate_keys:
sql = """
DELETE FROM receipts_graph
WHERE
room_id = ? AND
receipt_type = ? AND
user_id = ? AND
thread_id IS NULL
"""
txn.execute(sql, (room_id, receipt_type, user_id))
await self.db_pool.runInteraction(
self.RECEIPTS_GRAPH_UNIQUE_INDEX_UPDATE_NAME,
_remote_duplicate_receipts_txn,
)
await self._create_receipts_index(
"receipts_graph_unique_index",
"receipts_graph",
)
await self.db_pool.updates._end_background_update(
self.RECEIPTS_GRAPH_UNIQUE_INDEX_UPDATE_NAME
)
return 1
class ReceiptsStore(ReceiptsWorkerStore, ReceiptsBackgroundUpdateStore):
pass

209
tests/storage/databases/main/test_receipts.py Normal file
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@ -0,0 +1,209 @@
# 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.
from typing import Any, Dict, Optional, Sequence, Tuple
from twisted.test.proto_helpers import MemoryReactor
from synapse.rest import admin
from synapse.rest.client import login, room
from synapse.server import HomeServer
from synapse.storage.database import LoggingTransaction
from synapse.util import Clock
from tests.unittest import HomeserverTestCase
class ReceiptsBackgroundUpdateStoreTestCase(HomeserverTestCase):
servlets = [
admin.register_servlets,
room.register_servlets,
login.register_servlets,
]
def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer):
self.store = hs.get_datastores().main
self.user_id = self.register_user("foo", "pass")
self.token = self.login("foo", "pass")
self.room_id = self.helper.create_room_as(self.user_id, tok=self.token)
self.other_room_id = self.helper.create_room_as(self.user_id, tok=self.token)
def _test_background_receipts_unique_index(
self,
update_name: str,
index_name: str,
table: str,
receipts: Dict[Tuple[str, str, str], Sequence[Dict[str, Any]]],
expected_unique_receipts: Dict[Tuple[str, str, str], Optional[Dict[str, Any]]],
):
"""Test that the background update to uniqueify non-thread receipts in
the given receipts table works properly.
Args:
update_name: The name of the background update to test.
index_name: The name of the index that the background update creates.
table: The table of receipts that the background update fixes.
receipts: The test data containing duplicate receipts.
A list of receipt rows to insert, grouped by
`(room_id, receipt_type, user_id)`.
expected_unique_receipts: A dictionary of `(room_id, receipt_type, user_id)`
keys and expected receipt key-values after duplicate receipts have been
removed.
"""
# First, undo the background update.
def drop_receipts_unique_index(txn: LoggingTransaction) -> None:
txn.execute(f"DROP INDEX IF EXISTS {index_name}")
self.get_success(
self.store.db_pool.runInteraction(
"drop_receipts_unique_index",
drop_receipts_unique_index,
)
)
# Populate the receipts table, including duplicates.
for (room_id, receipt_type, user_id), rows in receipts.items():
for row in rows:
self.get_success(
self.store.db_pool.simple_insert(
table,
{
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
"thread_id": None,
"data": "{}",
**row,
},
)
)
# Insert and run the background update.
self.get_success(
self.store.db_pool.simple_insert(
"background_updates",
{
"update_name": update_name,
"progress_json": "{}",
},
)
)
self.store.db_pool.updates._all_done = False
self.wait_for_background_updates()
# Check that the remaining receipts match expectations.
for (
room_id,
receipt_type,
user_id,
), expected_row in expected_unique_receipts.items():
# Include the receipt key in the returned columns, for more informative
# assertion messages.
columns = ["room_id", "receipt_type", "user_id"]
if expected_row is not None:
columns += expected_row.keys()
rows = self.get_success(
self.store.db_pool.simple_select_list(
table=table,
keyvalues={
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
# `simple_select_onecol` does not support NULL filters,
# so skip the filter on `thread_id`.
},
retcols=columns,
desc="get_receipt",
)
)
if expected_row is not None:
self.assertEqual(
len(rows),
1,
f"Background update did not leave behind latest receipt in {table}",
)
self.assertEqual(
rows[0],
{
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
**expected_row,
},
)
else:
self.assertEqual(
len(rows),
0,
f"Background update did not remove all duplicate receipts from {table}",
)
def test_background_receipts_linearized_unique_index(self):
"""Test that the background update to uniqueify non-thread receipts in
`receipts_linearized` works properly.
"""
self._test_background_receipts_unique_index(
"receipts_linearized_unique_index",
"receipts_linearized_unique_index",
"receipts_linearized",
receipts={
(self.room_id, "m.read", self.user_id): [
{"stream_id": 5, "event_id": "$some_event"},
{"stream_id": 6, "event_id": "$some_event"},
],
(self.other_room_id, "m.read", self.user_id): [
{"stream_id": 7, "event_id": "$some_event"}
],
},
expected_unique_receipts={
(self.room_id, "m.read", self.user_id): {"stream_id": 6},
(self.other_room_id, "m.read", self.user_id): {"stream_id": 7},
},
)
def test_background_receipts_graph_unique_index(self):
"""Test that the background update to uniqueify non-thread receipts in
`receipts_graph` works properly.
"""
self._test_background_receipts_unique_index(
"receipts_graph_unique_index",
"receipts_graph_unique_index",
"receipts_graph",
receipts={
(self.room_id, "m.read", self.user_id): [
{
"event_ids": '["$some_event"]',
},
{
"event_ids": '["$some_event"]',
},
],
(self.other_room_id, "m.read", self.user_id): [
{
"event_ids": '["$some_event"]',
}
],
},
expected_unique_receipts={
(self.room_id, "m.read", self.user_id): None,
(self.other_room_id, "m.read", self.user_id): {
"event_ids": '["$some_event"]'
},
},
)