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Merge pull request #6295 from matrix-org/erikj/split_purge_history

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Split purge API into events vs state and add PurgeEventsStorage
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Erik Johnston 2019-11-08 10:19:15 +00:00 committed by GitHub
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8 changed files with 335 additions and 182 deletions
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1
changelog.d/6295.misc Normal file
View file

@ -0,0 +1 @@
Split out state storage into separate data store.

6
synapse/handlers/pagination.py
View file

@ -127,7 +127,9 @@ class PaginationHandler(object):
self._purges_in_progress_by_room.add(room_id)
try:
with (yield self.pagination_lock.write(room_id)):
yield self.store.purge_history(room_id, token, delete_local_events)
yield self.storage.purge_events.purge_history(
room_id, token, delete_local_events
)
logger.info("[purge] complete")
self._purges_by_id[purge_id].status = PurgeStatus.STATUS_COMPLETE
except Exception:
@ -170,7 +172,7 @@ class PaginationHandler(object):
if joined:
raise SynapseError(400, "Users are still joined to this room")
await self.store.purge_room(room_id)
await self.storage.purge_events.purge_room(room_id)
@defer.inlineCallbacks
def get_messages(

2
synapse/storage/__init__.py
View file

@ -30,6 +30,7 @@ stored in `synapse.storage.schema`.
from synapse.storage.data_stores import DataStores
from synapse.storage.data_stores.main import DataStore
from synapse.storage.persist_events import EventsPersistenceStorage
from synapse.storage.purge_events import PurgeEventsStorage
from synapse.storage.state import StateGroupStorage
__all__ = ["DataStores", "DataStore"]
@ -46,6 +47,7 @@ class Storage(object):
self.main = stores.main
self.persistence = EventsPersistenceStorage(hs, stores)
self.purge_events = PurgeEventsStorage(hs, stores)
self.state = StateGroupStorage(hs, stores)

349
synapse/storage/data_stores/main/events.py
View file

@ -1375,6 +1375,10 @@ class EventsStore(
if True, we will delete local events as well as remote ones
(instead of just marking them as outliers and deleting their
state groups).
Returns:
Deferred[set[int]]: The set of state groups that are referenced by
deleted events.
"""
return self.runInteraction(
@ -1511,11 +1515,10 @@ class EventsStore(
[(room_id, event_id) for event_id, in new_backwards_extrems],
)
logger.info("[purge] finding redundant state groups")
logger.info("[purge] finding state groups referenced by deleted events")
# Get all state groups that are referenced by events that are to be
# deleted. We then go and check if they are referenced by other events
# or state groups, and if not we delete them.
# deleted.
txn.execute(
"""
SELECT DISTINCT state_group FROM events_to_purge
@ -1528,60 +1531,6 @@ class EventsStore(
"[purge] found %i referenced state groups", len(referenced_state_groups)
)
logger.info("[purge] finding state groups that can be deleted")
_ = self._find_unreferenced_groups_during_purge(txn, referenced_state_groups)
state_groups_to_delete, remaining_state_groups = _
logger.info(
"[purge] found %i state groups to delete", len(state_groups_to_delete)
)
logger.info(
"[purge] de-delta-ing %i remaining state groups",
len(remaining_state_groups),
)
# Now we turn the state groups that reference to-be-deleted state
# groups to non delta versions.
for sg in remaining_state_groups:
logger.info("[purge] de-delta-ing remaining state group %s", sg)
curr_state = self._get_state_groups_from_groups_txn(txn, [sg])
curr_state = curr_state[sg]
self._simple_delete_txn(
txn, table="state_groups_state", keyvalues={"state_group": sg}
)
self._simple_delete_txn(
txn, table="state_group_edges", keyvalues={"state_group": sg}
)
self._simple_insert_many_txn(
txn,
table="state_groups_state",
values=[
{
"state_group": sg,
"room_id": room_id,
"type": key[0],
"state_key": key[1],
"event_id": state_id,
}
for key, state_id in iteritems(curr_state)
],
)
logger.info("[purge] removing redundant state groups")
txn.executemany(
"DELETE FROM state_groups_state WHERE state_group = ?",
((sg,) for sg in state_groups_to_delete),
)
txn.executemany(
"DELETE FROM state_groups WHERE id = ?",
((sg,) for sg in state_groups_to_delete),
)
logger.info("[purge] removing events from event_to_state_groups")
txn.execute(
"DELETE FROM event_to_state_groups "
@ -1668,138 +1617,35 @@ class EventsStore(
logger.info("[purge] done")
def _find_unreferenced_groups_during_purge(self, txn, state_groups):
"""Used when purging history to figure out which state groups can be
deleted and which need to be de-delta'ed (due to one of its prev groups
being scheduled for deletion).
Args:
txn
state_groups (set[int]): Set of state groups referenced by events
that are going to be deleted.
Returns:
tuple[set[int], set[int]]: The set of state groups that can be
deleted and the set of state groups that need to be de-delta'ed
"""
# Graph of state group -> previous group
graph = {}
# Set of events that we have found to be referenced by events
referenced_groups = set()
# Set of state groups we've already seen
state_groups_seen = set(state_groups)
# Set of state groups to handle next.
next_to_search = set(state_groups)
while next_to_search:
# We bound size of groups we're looking up at once, to stop the
# SQL query getting too big
if len(next_to_search) < 100:
current_search = next_to_search
next_to_search = set()
else:
current_search = set(itertools.islice(next_to_search, 100))
next_to_search -= current_search
# Check if state groups are referenced
sql = """
SELECT DISTINCT state_group FROM event_to_state_groups
LEFT JOIN events_to_purge AS ep USING (event_id)
WHERE ep.event_id IS NULL AND
"""
clause, args = make_in_list_sql_clause(
txn.database_engine, "state_group", current_search
)
txn.execute(sql + clause, list(args))
referenced = set(sg for sg, in txn)
referenced_groups |= referenced
# We don't continue iterating up the state group graphs for state
# groups that are referenced.
current_search -= referenced
rows = self._simple_select_many_txn(
txn,
table="state_group_edges",
column="prev_state_group",
iterable=current_search,
keyvalues={},
retcols=("prev_state_group", "state_group"),
)
prevs = set(row["state_group"] for row in rows)
# We don't bother re-handling groups we've already seen
prevs -= state_groups_seen
next_to_search |= prevs
state_groups_seen |= prevs
for row in rows:
# Note: Each state group can have at most one prev group
graph[row["state_group"]] = row["prev_state_group"]
to_delete = state_groups_seen - referenced_groups
to_dedelta = set()
for sg in referenced_groups:
prev_sg = graph.get(sg)
if prev_sg and prev_sg in to_delete:
to_dedelta.add(sg)
return to_delete, to_dedelta
return referenced_state_groups
def purge_room(self, room_id):
"""Deletes all record of a room
Args:
room_id (str):
room_id (str)
Returns:
Deferred[List[int]]: The list of state groups to delete.
"""
return self.runInteraction("purge_room", self._purge_room_txn, room_id)
def _purge_room_txn(self, txn, room_id):
# first we have to delete the state groups states
logger.info("[purge] removing %s from state_groups_state", room_id)
# First we fetch all the state groups that should be deleted, before
# we delete that information.
txn.execute(
"""
DELETE FROM state_groups_state WHERE state_group IN (
SELECT state_group FROM events JOIN event_to_state_groups USING(event_id)
WHERE events.room_id=?
)
SELECT DISTINCT state_group FROM events
INNER JOIN event_to_state_groups USING(event_id)
WHERE events.room_id = ?
""",
(room_id,),
)
# ... and the state group edges
logger.info("[purge] removing %s from state_group_edges", room_id)
state_groups = [row[0] for row in txn]
txn.execute(
"""
DELETE FROM state_group_edges WHERE state_group IN (
SELECT state_group FROM events JOIN event_to_state_groups USING(event_id)
WHERE events.room_id=?
)
""",
(room_id,),
)
# ... and the state groups
logger.info("[purge] removing %s from state_groups", room_id)
txn.execute(
"""
DELETE FROM state_groups WHERE id IN (
SELECT state_group FROM events JOIN event_to_state_groups USING(event_id)
WHERE events.room_id=?
)
""",
(room_id,),
)
# and then tables which lack an index on room_id but have one on event_id
# Now we delete tables which lack an index on room_id but have one on event_id
for table in (
"event_auth",
"event_edges",
@ -1887,6 +1733,165 @@ class EventsStore(
logger.info("[purge] done")
return state_groups
def purge_unreferenced_state_groups(
self, room_id: str, state_groups_to_delete
) -> defer.Deferred:
"""Deletes no longer referenced state groups and de-deltas any state
groups that reference them.
Args:
room_id: The room the state groups belong to (must all be in the
same room).
state_groups_to_delete (Collection[int]): Set of all state groups
to delete.
"""
return self.runInteraction(
"purge_unreferenced_state_groups",
self._purge_unreferenced_state_groups,
room_id,
state_groups_to_delete,
)
def _purge_unreferenced_state_groups(self, txn, room_id, state_groups_to_delete):
logger.info(
"[purge] found %i state groups to delete", len(state_groups_to_delete)
)
rows = self._simple_select_many_txn(
txn,
table="state_group_edges",
column="prev_state_group",
iterable=state_groups_to_delete,
keyvalues={},
retcols=("state_group",),
)
remaining_state_groups = set(
row["state_group"]
for row in rows
if row["state_group"] not in state_groups_to_delete
)
logger.info(
"[purge] de-delta-ing %i remaining state groups",
len(remaining_state_groups),
)
# Now we turn the state groups that reference to-be-deleted state
# groups to non delta versions.
for sg in remaining_state_groups:
logger.info("[purge] de-delta-ing remaining state group %s", sg)
curr_state = self._get_state_groups_from_groups_txn(txn, [sg])
curr_state = curr_state[sg]
self._simple_delete_txn(
txn, table="state_groups_state", keyvalues={"state_group": sg}
)
self._simple_delete_txn(
txn, table="state_group_edges", keyvalues={"state_group": sg}
)
self._simple_insert_many_txn(
txn,
table="state_groups_state",
values=[
{
"state_group": sg,
"room_id": room_id,
"type": key[0],
"state_key": key[1],
"event_id": state_id,
}
for key, state_id in iteritems(curr_state)
],
)
logger.info("[purge] removing redundant state groups")
txn.executemany(
"DELETE FROM state_groups_state WHERE state_group = ?",
((sg,) for sg in state_groups_to_delete),
)
txn.executemany(
"DELETE FROM state_groups WHERE id = ?",
((sg,) for sg in state_groups_to_delete),
)
@defer.inlineCallbacks
def get_previous_state_groups(self, state_groups):
"""Fetch the previous groups of the given state groups.
Args:
state_groups (Iterable[int])
Returns:
Deferred[dict[int, int]]: mapping from state group to previous
state group.
"""
rows = yield self._simple_select_many_batch(
table="state_group_edges",
column="prev_state_group",
iterable=state_groups,
keyvalues={},
retcols=("prev_state_group", "state_group"),
desc="get_previous_state_groups",
)
return {row["state_group"]: row["prev_state_group"] for row in rows}
def purge_room_state(self, room_id, state_groups_to_delete):
"""Deletes all record of a room from state tables
Args:
room_id (str):
state_groups_to_delete (list[int]): State groups to delete
"""
return self.runInteraction(
"purge_room_state",
self._purge_room_state_txn,
room_id,
state_groups_to_delete,
)
def _purge_room_state_txn(self, txn, room_id, state_groups_to_delete):
# first we have to delete the state groups states
logger.info("[purge] removing %s from state_groups_state", room_id)
self._simple_delete_many_txn(
txn,
table="state_groups_state",
column="state_group",
iterable=state_groups_to_delete,
keyvalues={},
)
# ... and the state group edges
logger.info("[purge] removing %s from state_group_edges", room_id)
self._simple_delete_many_txn(
txn,
table="state_group_edges",
column="state_group",
iterable=state_groups_to_delete,
keyvalues={},
)
# ... and the state groups
logger.info("[purge] removing %s from state_groups", room_id)
self._simple_delete_many_txn(
txn,
table="state_groups",
column="id",
iterable=state_groups_to_delete,
keyvalues={},
)
async def is_event_after(self, event_id1, event_id2):
"""Returns True if event_id1 is after event_id2 in the stream
"""

23
synapse/storage/data_stores/main/state.py
View file

@ -995,6 +995,29 @@ class StateGroupWorkerStore(
return self.runInteraction("store_state_group", _store_state_group_txn)
@defer.inlineCallbacks
def get_referenced_state_groups(self, state_groups):
"""Check if the state groups are referenced by events.
Args:
state_groups (Iterable[int])
Returns:
Deferred[set[int]]: The subset of state groups that are
referenced.
"""
rows = yield self._simple_select_many_batch(
table="event_to_state_groups",
column="state_group",
iterable=state_groups,
keyvalues={},
retcols=("DISTINCT state_group",),
desc="get_referenced_state_groups",
)
return set(row["state_group"] for row in rows)
class StateBackgroundUpdateStore(
StateGroupBackgroundUpdateStore, BackgroundUpdateStore

117
synapse/storage/purge_events.py Normal file
View file

@ -0,0 +1,117 @@
# -*- coding: utf-8 -*-
# Copyright 2019 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.
import itertools
import logging
from twisted.internet import defer
logger = logging.getLogger(__name__)
class PurgeEventsStorage(object):
"""High level interface for purging rooms and event history.
"""
def __init__(self, hs, stores):
self.stores = stores
@defer.inlineCallbacks
def purge_room(self, room_id: str):
"""Deletes all record of a room
"""
state_groups_to_delete = yield self.stores.main.purge_room(room_id)
yield self.stores.main.purge_room_state(room_id, state_groups_to_delete)
@defer.inlineCallbacks
def purge_history(self, room_id, token, delete_local_events):
"""Deletes room history before a certain point
Args:
room_id (str):
token (str): A topological token to delete events before
delete_local_events (bool):
if True, we will delete local events as well as remote ones
(instead of just marking them as outliers and deleting their
state groups).
"""
state_groups = yield self.stores.main.purge_history(
room_id, token, delete_local_events
)
logger.info("[purge] finding state groups that can be deleted")
sg_to_delete = yield self._find_unreferenced_groups(state_groups)
yield self.stores.main.purge_unreferenced_state_groups(room_id, sg_to_delete)
@defer.inlineCallbacks
def _find_unreferenced_groups(self, state_groups):
"""Used when purging history to figure out which state groups can be
deleted.
Args:
state_groups (set[int]): Set of state groups referenced by events
that are going to be deleted.
Returns:
Deferred[set[int]] The set of state groups that can be deleted.
"""
# Graph of state group -> previous group
graph = {}
# Set of events that we have found to be referenced by events
referenced_groups = set()
# Set of state groups we've already seen
state_groups_seen = set(state_groups)
# Set of state groups to handle next.
next_to_search = set(state_groups)
while next_to_search:
# We bound size of groups we're looking up at once, to stop the
# SQL query getting too big
if len(next_to_search) < 100:
current_search = next_to_search
next_to_search = set()
else:
current_search = set(itertools.islice(next_to_search, 100))
next_to_search -= current_search
referenced = yield self.stores.main.get_referenced_state_groups(
current_search
)
referenced_groups |= referenced
# We don't continue iterating up the state group graphs for state
# groups that are referenced.
current_search -= referenced
edges = yield self.stores.main.get_previous_state_groups(current_search)
prevs = set(edges.values())
# We don't bother re-handling groups we've already seen
prevs -= state_groups_seen
next_to_search |= prevs
state_groups_seen |= prevs
graph.update(edges)
to_delete = state_groups_seen - referenced_groups
return to_delete

4
tests/rest/admin/test_admin.py
View file

@ -628,10 +628,12 @@ class PurgeRoomTestCase(unittest.HomeserverTestCase):
"local_invites",
"room_account_data",
"room_tags",
"state_groups",
"state_groups_state",
):
count = self.get_success(
self.store._simple_select_one_onecol(
table="events",
table=table,
keyvalues={"room_id": room_id},
retcol="COUNT(*)",
desc="test_purge_room",

15
tests/storage/test_purge.py
View file

@ -40,23 +40,24 @@ class PurgeTests(HomeserverTestCase):
third = self.helper.send(self.room_id, body="test3")
last = self.helper.send(self.room_id, body="test4")
storage = self.hs.get_datastore()
store = self.hs.get_datastore()
storage = self.hs.get_storage()
# Get the topological token
event = storage.get_topological_token_for_event(last["event_id"])
event = store.get_topological_token_for_event(last["event_id"])
self.pump()
event = self.successResultOf(event)
# Purge everything before this topological token
purge = storage.purge_history(self.room_id, event, True)
purge = storage.purge_events.purge_history(self.room_id, event, True)
self.pump()
self.assertEqual(self.successResultOf(purge), None)
# Try and get the events
get_first = storage.get_event(first["event_id"])
get_second = storage.get_event(second["event_id"])
get_third = storage.get_event(third["event_id"])
get_last = storage.get_event(last["event_id"])
get_first = store.get_event(first["event_id"])
get_second = store.get_event(second["event_id"])
get_third = store.get_event(third["event_id"])
get_last = store.get_event(last["event_id"])
self.pump()
# 1-3 should fail and last will succeed, meaning that 1-3 are deleted