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Add background update for add chain cover index (#9029)

This commit is contained in:
Erik Johnston 2021-01-14 15:18:27 +00:00 committed by GitHub
parent 21a296cd5a
commit 7036e24e98
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7 changed files with 360 additions and 18 deletions
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2
changelog.d/8868.misc
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@ -1 +1 @@
Improve efficiency of large state resolutions for new rooms.
Improve efficiency of large state resolutions.

1
changelog.d/9029.misc Normal file
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@ -0,0 +1 @@
Improve efficiency of large state resolutions.

2
scripts/synapse_port_db
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@ -70,7 +70,7 @@ logger = logging.getLogger("synapse_port_db")
BOOLEAN_COLUMNS = {
"events": ["processed", "outlier", "contains_url"],
"rooms": ["is_public"],
"rooms": ["is_public", "has_auth_chain_index"],
"event_edges": ["is_state"],
"presence_list": ["accepted"],
"presence_stream": ["currently_active"],

50
synapse/storage/databases/main/events.py
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@ -466,9 +466,6 @@ class PersistEventsStore:
if not state_events:
return
# Map from event ID to chain ID/sequence number.
chain_map = {} # type: Dict[str, Tuple[int, int]]
# We need to know the type/state_key and auth events of the events we're
# calculating chain IDs for. We don't rely on having the full Event
# instances as we'll potentially be pulling more events from the DB and
@ -479,9 +476,33 @@ class PersistEventsStore:
event_to_auth_chain = {
e.event_id: e.auth_event_ids() for e in state_events.values()
}
event_to_room_id = {e.event_id: e.room_id for e in state_events.values()}
self._add_chain_cover_index(
txn, event_to_room_id, event_to_types, event_to_auth_chain
)
def _add_chain_cover_index(
self,
txn,
event_to_room_id: Dict[str, str],
event_to_types: Dict[str, Tuple[str, str]],
event_to_auth_chain: Dict[str, List[str]],
) -> None:
"""Calculate the chain cover index for the given events.
Args:
event_to_room_id: Event ID to the room ID of the event
event_to_types: Event ID to type and state_key of the event
event_to_auth_chain: Event ID to list of auth event IDs of the
event (events with no auth events can be excluded).
"""
# Map from event ID to chain ID/sequence number.
chain_map = {} # type: Dict[str, Tuple[int, int]]
# Set of event IDs to calculate chain ID/seq numbers for.
events_to_calc_chain_id_for = set(state_events)
events_to_calc_chain_id_for = set(event_to_room_id)
# We check if there are any events that need to be handled in the rooms
# we're looking at. These should just be out of band memberships, where
@ -491,7 +512,7 @@ class PersistEventsStore:
table="event_auth_chain_to_calculate",
keyvalues={},
column="room_id",
iterable={e.room_id for e in state_events.values()},
iterable=set(event_to_room_id.values()),
retcols=("event_id", "type", "state_key"),
)
for row in rows:
@ -582,16 +603,17 @@ class PersistEventsStore:
# the list of events to calculate chain IDs for next time
# around. (Otherwise we will have already added it to the
# table).
event = state_events.get(event_id)
if event:
room_id = event_to_room_id.get(event_id)
if room_id:
e_type, state_key = event_to_types[event_id]
self.db_pool.simple_insert_txn(
txn,
table="event_auth_chain_to_calculate",
values={
"event_id": event.event_id,
"room_id": event.room_id,
"type": event.type,
"state_key": event.state_key,
"event_id": event_id,
"room_id": room_id,
"type": e_type,
"state_key": state_key,
},
)
@ -617,7 +639,7 @@ class PersistEventsStore:
events_to_calc_chain_id_for, event_to_auth_chain
):
existing_chain_id = None
for auth_id in event_to_auth_chain[event_id]:
for auth_id in event_to_auth_chain.get(event_id, []):
if event_to_types.get(event_id) == event_to_types.get(auth_id):
existing_chain_id = chain_map[auth_id]
break
@ -730,11 +752,11 @@ class PersistEventsStore:
# auth events (A, B) to check if B is reachable from A.
reduction = {
a_id
for a_id in event_to_auth_chain[event_id]
for a_id in event_to_auth_chain.get(event_id, [])
if chain_map[a_id][0] != chain_id
}
for start_auth_id, end_auth_id in itertools.permutations(
event_to_auth_chain[event_id], r=2,
event_to_auth_chain.get(event_id, []), r=2,
):
if chain_links.exists_path_from(
chain_map[start_auth_id], chain_map[end_auth_id]

192
synapse/storage/databases/main/events_bg_updates.py
View File

@ -14,13 +14,13 @@
# limitations under the License.
import logging
from typing import List, Tuple
from typing import Dict, List, Optional, Tuple
from synapse.api.constants import EventContentFields
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
from synapse.events import make_event_from_dict
from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
from synapse.storage.database import DatabasePool
from synapse.storage.database import DatabasePool, make_tuple_comparison_clause
from synapse.storage.types import Cursor
from synapse.types import JsonDict
@ -108,6 +108,10 @@ class EventsBackgroundUpdatesStore(SQLBaseStore):
"rejected_events_metadata", self._rejected_events_metadata,
)
self.db_pool.updates.register_background_update_handler(
"chain_cover", self._chain_cover_index,
)
async def _background_reindex_fields_sender(self, progress, batch_size):
target_min_stream_id = progress["target_min_stream_id_inclusive"]
max_stream_id = progress["max_stream_id_exclusive"]
@ -706,3 +710,187 @@ class EventsBackgroundUpdatesStore(SQLBaseStore):
)
return len(results)
async def _chain_cover_index(self, progress: dict, batch_size: int) -> int:
"""A background updates that iterates over all rooms and generates the
chain cover index for them.
"""
current_room_id = progress.get("current_room_id", "")
# Have we finished processing the current room.
finished = progress.get("finished", True)
# Where we've processed up to in the room, defaults to the start of the
# room.
last_depth = progress.get("last_depth", -1)
last_stream = progress.get("last_stream", -1)
# Have we set the `has_auth_chain_index` for the room yet.
has_set_room_has_chain_index = progress.get(
"has_set_room_has_chain_index", False
)
if finished:
# If we've finished with the previous room (or its our first
# iteration) we move on to the next room.
def _get_next_room(txn: Cursor) -> Optional[str]:
sql = """
SELECT room_id FROM rooms
WHERE room_id > ?
AND (
NOT has_auth_chain_index
OR has_auth_chain_index IS NULL
)
ORDER BY room_id
LIMIT 1
"""
txn.execute(sql, (current_room_id,))
row = txn.fetchone()
if row:
return row[0]
return None
current_room_id = await self.db_pool.runInteraction(
"_chain_cover_index", _get_next_room
)
if not current_room_id:
await self.db_pool.updates._end_background_update("chain_cover")
return 0
logger.debug("Adding chain cover to %s", current_room_id)
def _calculate_auth_chain(
txn: Cursor, last_depth: int, last_stream: int
) -> Tuple[int, int, int]:
# Get the next set of events in the room (that we haven't already
# computed chain cover for). We do this in topological order.
# We want to do a `(topological_ordering, stream_ordering) > (?,?)`
# comparison, but that is not supported on older SQLite versions
tuple_clause, tuple_args = make_tuple_comparison_clause(
self.database_engine,
[
("topological_ordering", last_depth),
("stream_ordering", last_stream),
],
)
sql = """
SELECT
event_id, state_events.type, state_events.state_key,
topological_ordering, stream_ordering
FROM events
INNER JOIN state_events USING (event_id)
LEFT JOIN event_auth_chains USING (event_id)
LEFT JOIN event_auth_chain_to_calculate USING (event_id)
WHERE events.room_id = ?
AND event_auth_chains.event_id IS NULL
AND event_auth_chain_to_calculate.event_id IS NULL
AND %(tuple_cmp)s
ORDER BY topological_ordering, stream_ordering
LIMIT ?
""" % {
"tuple_cmp": tuple_clause,
}
args = [current_room_id]
args.extend(tuple_args)
args.append(batch_size)
txn.execute(sql, args)
rows = txn.fetchall()
# Put the results in the necessary format for
# `_add_chain_cover_index`
event_to_room_id = {row[0]: current_room_id for row in rows}
event_to_types = {row[0]: (row[1], row[2]) for row in rows}
new_last_depth = rows[-1][3] if rows else last_depth # type: int
new_last_stream = rows[-1][4] if rows else last_stream # type: int
count = len(rows)
# We also need to fetch the auth events for them.
auth_events = self.db_pool.simple_select_many_txn(
txn,
table="event_auth",
column="event_id",
iterable=event_to_room_id,
keyvalues={},
retcols=("event_id", "auth_id"),
)
event_to_auth_chain = {} # type: Dict[str, List[str]]
for row in auth_events:
event_to_auth_chain.setdefault(row["event_id"], []).append(
row["auth_id"]
)
# Calculate and persist the chain cover index for this set of events.
#
# Annoyingly we need to gut wrench into the persit event store so that
# we can reuse the function to calculate the chain cover for rooms.
self.hs.get_datastores().persist_events._add_chain_cover_index(
txn, event_to_room_id, event_to_types, event_to_auth_chain,
)
return new_last_depth, new_last_stream, count
last_depth, last_stream, count = await self.db_pool.runInteraction(
"_chain_cover_index", _calculate_auth_chain, last_depth, last_stream
)
total_rows_processed = count
if count < batch_size and not has_set_room_has_chain_index:
# If we've done all the events in the room we flip the
# `has_auth_chain_index` in the DB. Note that its possible for
# further events to be persisted between the above and setting the
# flag without having the chain cover calculated for them. This is
# fine as a) the code gracefully handles these cases and b) we'll
# calculate them below.
await self.db_pool.simple_update(
table="rooms",
keyvalues={"room_id": current_room_id},
updatevalues={"has_auth_chain_index": True},
desc="_chain_cover_index",
)
has_set_room_has_chain_index = True
# Handle any events that might have raced with us flipping the
# bit above.
last_depth, last_stream, count = await self.db_pool.runInteraction(
"_chain_cover_index", _calculate_auth_chain, last_depth, last_stream
)
total_rows_processed += count
# Note that at this point its technically possible that more events
# than our `batch_size` have been persisted without their chain
# cover, so we need to continue processing this room if the last
# count returned was equal to the `batch_size`.
if count < batch_size:
# We've finished calculating the index for this room, move on to the
# next room.
await self.db_pool.updates._background_update_progress(
"chain_cover", {"current_room_id": current_room_id, "finished": True},
)
else:
# We still have outstanding events to calculate the index for.
await self.db_pool.updates._background_update_progress(
"chain_cover",
{
"current_room_id": current_room_id,
"last_depth": last_depth,
"last_stream": last_stream,
"has_auth_chain_index": has_set_room_has_chain_index,
"finished": False,
},
)
return total_rows_processed

17
synapse/storage/databases/main/schema/delta/59/06chain_cover_index.sql Normal file
View File

@ -0,0 +1,17 @@
/* Copyright 2020 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.
*/
INSERT INTO background_updates (ordering, update_name, progress_json, depends_on) VALUES
(5906, 'chain_cover', '{}', 'rejected_events_metadata');

114
tests/storage/test_event_chain.py
View File

@ -20,7 +20,10 @@ from twisted.trial import unittest
from synapse.api.constants import EventTypes
from synapse.api.room_versions import RoomVersions
from synapse.events import EventBase
from synapse.rest import admin
from synapse.rest.client.v1 import login, room
from synapse.storage.databases.main.events import _LinkMap
from synapse.types import create_requester
from tests.unittest import HomeserverTestCase
@ -470,3 +473,114 @@ class LinkMapTestCase(unittest.TestCase):
self.assertCountEqual(link_map.get_links_between(1, 2), [(1, 1), (3, 3)])
self.assertCountEqual(link_map.get_additions(), [(1, 3, 2, 3), (2, 5, 1, 3)])
class EventChainBackgroundUpdateTestCase(HomeserverTestCase):
servlets = [
admin.register_servlets,
room.register_servlets,
login.register_servlets,
]
def test_background_update(self):
"""Test that the background update to calculate auth chains for historic
rooms works correctly.
"""
# Create a room
user_id = self.register_user("foo", "pass")
token = self.login("foo", "pass")
room_id = self.helper.create_room_as(user_id, tok=token)
requester = create_requester(user_id)
store = self.hs.get_datastore()
# Mark the room as not having a chain cover index
self.get_success(
store.db_pool.simple_update(
table="rooms",
keyvalues={"room_id": room_id},
updatevalues={"has_auth_chain_index": False},
desc="test",
)
)
# Create a fork in the DAG with different events.
event_handler = self.hs.get_event_creation_handler()
latest_event_ids = self.get_success(store.get_prev_events_for_room(room_id))
event, context = self.get_success(
event_handler.create_event(
requester,
{
"type": "some_state_type",
"state_key": "",
"content": {},
"room_id": room_id,
"sender": user_id,
},
prev_event_ids=latest_event_ids,
)
)
self.get_success(
event_handler.handle_new_client_event(requester, event, context)
)
state1 = list(self.get_success(context.get_current_state_ids()).values())
event, context = self.get_success(
event_handler.create_event(
requester,
{
"type": "some_state_type",
"state_key": "",
"content": {},
"room_id": room_id,
"sender": user_id,
},
prev_event_ids=latest_event_ids,
)
)
self.get_success(
event_handler.handle_new_client_event(requester, event, context)
)
state2 = list(self.get_success(context.get_current_state_ids()).values())
# Delete the chain cover info.
def _delete_tables(txn):
txn.execute("DELETE FROM event_auth_chains")
txn.execute("DELETE FROM event_auth_chain_links")
self.get_success(store.db_pool.runInteraction("test", _delete_tables))
# Insert and run the background update.
self.get_success(
store.db_pool.simple_insert(
"background_updates",
{"update_name": "chain_cover", "progress_json": "{}"},
)
)
# Ugh, have to reset this flag
store.db_pool.updates._all_done = False
while not self.get_success(
store.db_pool.updates.has_completed_background_updates()
):
self.get_success(
store.db_pool.updates.do_next_background_update(100), by=0.1
)
# Test that the `has_auth_chain_index` has been set
self.assertTrue(self.get_success(store.has_auth_chain_index(room_id)))
# Test that calculating the auth chain difference using the newly
# calculated chain cover works.
self.get_success(
store.db_pool.runInteraction(
"test",
store._get_auth_chain_difference_using_cover_index_txn,
room_id,
[state1, state2],
)
)