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Batch fetch bundled references (#14508)

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Avoid an n+1 query problem and fetch the bundled aggregations for
m.reference relations in a single query instead of a query per event.

This applies similar logic for as was previously done for edits in
8b309adb43 (#11660; threads
in b65acead42 (#11752); and
annotations in 1799a54a54 (#14491).
This commit is contained in:
Patrick Cloke 2022-11-22 09:41:09 -05:00 committed by GitHub
parent 1799a54a54
commit 6d7523ef14
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6 changed files with 133 additions and 79 deletions
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1
changelog.d/14508.feature Normal file
View file

@ -0,0 +1 @@
Reduce database load of [Client-Server endpoints](https://spec.matrix.org/v1.4/client-server-api/#aggregations) which return bundled aggregations.

128
synapse/handlers/relations.py
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@ -13,16 +13,7 @@
# limitations under the License.
import enum
import logging
from typing import (
TYPE_CHECKING,
Collection,
Dict,
FrozenSet,
Iterable,
List,
Optional,
Tuple,
)
from typing import TYPE_CHECKING, Collection, Dict, FrozenSet, Iterable, List, Optional
import attr
@ -32,7 +23,7 @@ from synapse.events import EventBase, relation_from_event
from synapse.logging.opentracing import trace
from synapse.storage.databases.main.relations import ThreadsNextBatch, _RelatedEvent
from synapse.streams.config import PaginationConfig
from synapse.types import JsonDict, Requester, StreamToken, UserID
from synapse.types import JsonDict, Requester, UserID
from synapse.visibility import filter_events_for_client
if TYPE_CHECKING:
@ -181,40 +172,6 @@ class RelationsHandler:
return return_value
async def get_relations_for_event(
self,
event_id: str,
event: EventBase,
room_id: str,
relation_type: str,
ignored_users: FrozenSet[str] = frozenset(),
) -> Tuple[List[_RelatedEvent], Optional[StreamToken]]:
"""Get a list of events which relate to an event, ordered by topological ordering.
Args:
event_id: Fetch events that relate to this event ID.
event: The matching EventBase to event_id.
room_id: The room the event belongs to.
relation_type: The type of relation.
ignored_users: The users ignored by the requesting user.
Returns:
List of event IDs that match relations requested. The rows are of
the form `{"event_id": "..."}`.
"""
# Call the underlying storage method, which is cached.
related_events, next_token = await self._main_store.get_relations_for_event(
event_id, event, room_id, relation_type, direction="f"
)
# Filter out ignored users and convert to the expected format.
related_events = [
event for event in related_events if event.sender not in ignored_users
]
return related_events, next_token
async def redact_events_related_to(
self,
requester: Requester,
@ -329,6 +286,46 @@ class RelationsHandler:
return filtered_results
async def get_references_for_events(
self, event_ids: Collection[str], ignored_users: FrozenSet[str] = frozenset()
) -> Dict[str, List[_RelatedEvent]]:
"""Get a list of references to the given events.
Args:
event_ids: Fetch events that relate to this event ID.
ignored_users: The users ignored by the requesting user.
Returns:
A map of event IDs to a list related events.
"""
related_events = await self._main_store.get_references_for_events(event_ids)
# Avoid additional logic if there are no ignored users.
if not ignored_users:
return {
event_id: results
for event_id, results in related_events.items()
if results
}
# Filter out ignored users.
results = {}
for event_id, events in related_events.items():
# If no references, skip.
if not events:
continue
# Filter ignored users out.
events = [event for event in events if event.sender not in ignored_users]
# If there are no events left, skip this event.
if not events:
continue
results[event_id] = events
return results
async def _get_threads_for_events(
self,
events_by_id: Dict[str, EventBase],
@ -412,14 +409,18 @@ class RelationsHandler:
if event is None:
continue
potential_events, _ = await self.get_relations_for_event(
event_id,
event,
room_id,
RelationTypes.THREAD,
ignored_users,
# Attempt to find another event to use as the latest event.
potential_events, _ = await self._main_store.get_relations_for_event(
event_id, event, room_id, RelationTypes.THREAD, direction="f"
)
# Filter out ignored users.
potential_events = [
event
for event in potential_events
if event.sender not in ignored_users
]
# If all found events are from ignored users, do not include
# a summary of the thread.
if not potential_events:
@ -534,27 +535,16 @@ class RelationsHandler:
"chunk": annotations
}
# Fetch other relations per event.
for event in events_by_id.values():
# Fetch any references to bundle with this event.
references, next_token = await self.get_relations_for_event(
event.event_id,
event,
event.room_id,
RelationTypes.REFERENCE,
ignored_users=ignored_users,
)
# Fetch any references to bundle with this event.
references_by_event_id = await self.get_references_for_events(
events_by_id.keys(), ignored_users=ignored_users
)
for event_id, references in references_by_event_id.items():
if references:
aggregations = results.setdefault(event.event_id, BundledAggregations())
aggregations.references = {
results.setdefault(event_id, BundledAggregations()).references = {
"chunk": [{"event_id": ev.event_id} for ev in references]
}
if next_token:
aggregations.references["next_batch"] = await next_token.to_string(
self._main_store
)
# Fetch any edits (but not for redacted events).
#
# Note that there is no use in limiting edits by ignored users since the
@ -600,7 +590,7 @@ class RelationsHandler:
room_id, requester, allow_departed_users=True
)
# Note that ignored users are not passed into get_relations_for_event
# Note that ignored users are not passed into get_threads
# below. Ignored users are handled in filter_events_for_client (and by
# not passing them in here we should get a better cache hit rate).
thread_roots, next_batch = await self._main_store.get_threads(

1
synapse/storage/databases/main/cache.py
View file

@ -259,6 +259,7 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
if relates_to:
self._attempt_to_invalidate_cache("get_relations_for_event", (relates_to,))
self._attempt_to_invalidate_cache("get_references_for_event", (relates_to,))
self._attempt_to_invalidate_cache(
"get_aggregation_groups_for_event", (relates_to,)
)

4
synapse/storage/databases/main/events.py
View file

@ -2049,6 +2049,10 @@ class PersistEventsStore:
self.store._invalidate_cache_and_stream(
txn, self.store.get_aggregation_groups_for_event, (redacted_relates_to,)
)
if rel_type == RelationTypes.REFERENCE:
self.store._invalidate_cache_and_stream(
txn, self.store.get_references_for_event, (redacted_relates_to,)
)
if rel_type == RelationTypes.REPLACE:
self.store._invalidate_cache_and_stream(
txn, self.store.get_applicable_edit, (redacted_relates_to,)

74
synapse/storage/databases/main/relations.py
View file

@ -82,8 +82,6 @@ class _RelatedEvent:
event_id: str
# The sender of the related event.
sender: str
topological_ordering: Optional[int]
stream_ordering: int
class RelationsWorkerStore(SQLBaseStore):
@ -246,13 +244,17 @@ class RelationsWorkerStore(SQLBaseStore):
txn.execute(sql, where_args + [limit + 1])
events = []
for event_id, relation_type, sender, topo_ordering, stream_ordering in txn:
topo_orderings: List[int] = []
stream_orderings: List[int] = []
for event_id, relation_type, sender, topo_ordering, stream_ordering in cast(
List[Tuple[str, str, str, int, int]], txn
):
# Do not include edits for redacted events as they leak event
# content.
if not is_redacted or relation_type != RelationTypes.REPLACE:
events.append(
_RelatedEvent(event_id, sender, topo_ordering, stream_ordering)
)
events.append(_RelatedEvent(event_id, sender))
topo_orderings.append(topo_ordering)
stream_orderings.append(stream_ordering)
# If there are more events, generate the next pagination key from the
# last event returned.
@ -261,9 +263,11 @@ class RelationsWorkerStore(SQLBaseStore):
# Instead of using the last row (which tells us there is more
# data), use the last row to be returned.
events = events[:limit]
topo_orderings = topo_orderings[:limit]
stream_orderings = stream_orderings[:limit]
topo = events[-1].topological_ordering
token = events[-1].stream_ordering
topo = topo_orderings[-1]
token = stream_orderings[-1]
if direction == "b":
# Tokens are positions between events.
# This token points *after* the last event in the chunk.
@ -530,6 +534,60 @@ class RelationsWorkerStore(SQLBaseStore):
"get_aggregation_groups_for_users", _get_aggregation_groups_for_users_txn
)
@cached()
async def get_references_for_event(self, event_id: str) -> List[JsonDict]:
raise NotImplementedError()
@cachedList(cached_method_name="get_references_for_event", list_name="event_ids")
async def get_references_for_events(
self, event_ids: Collection[str]
) -> Mapping[str, Optional[List[_RelatedEvent]]]:
"""Get a list of references to the given events.
Args:
event_ids: Fetch events that relate to these event IDs.
Returns:
A map of event IDs to a list of related event IDs (and their senders).
"""
clause, args = make_in_list_sql_clause(
self.database_engine, "relates_to_id", event_ids
)
args.append(RelationTypes.REFERENCE)
sql = f"""
SELECT relates_to_id, ref.event_id, ref.sender
FROM events AS ref
INNER JOIN event_relations USING (event_id)
INNER JOIN events AS parent ON
parent.event_id = relates_to_id
AND parent.room_id = ref.room_id
WHERE
{clause}
AND relation_type = ?
ORDER BY ref.topological_ordering, ref.stream_ordering
"""
def _get_references_for_events_txn(
txn: LoggingTransaction,
) -> Mapping[str, List[_RelatedEvent]]:
txn.execute(sql, args)
result: Dict[str, List[_RelatedEvent]] = {}
for relates_to_id, event_id, sender in cast(
List[Tuple[str, str, str]], txn
):
result.setdefault(relates_to_id, []).append(
_RelatedEvent(event_id, sender)
)
return result
return await self.db_pool.runInteraction(
"_get_references_for_events_txn", _get_references_for_events_txn
)
@cached()
def get_applicable_edit(self, event_id: str) -> Optional[EventBase]:
raise NotImplementedError()

4
tests/rest/client/test_relations.py
View file

@ -1108,7 +1108,7 @@ class BundledAggregationsTestCase(BaseRelationsTestCase):
# The "user" sent the root event and is making queries for the bundled
# aggregations: they have participated.
self._test_bundled_aggregations(RelationTypes.THREAD, _gen_assert(True), 8)
self._test_bundled_aggregations(RelationTypes.THREAD, _gen_assert(True), 7)
# The "user2" sent replies in the thread and is making queries for the
# bundled aggregations: they have participated.
#
@ -1170,7 +1170,7 @@ class BundledAggregationsTestCase(BaseRelationsTestCase):
bundled_aggregations["latest_event"].get("unsigned"),
)
self._test_bundled_aggregations(RelationTypes.THREAD, assert_thread, 8)
self._test_bundled_aggregations(RelationTypes.THREAD, assert_thread, 7)
def test_nested_thread(self) -> None:
"""