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Add membership column to current_state_events table.

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It turns out that doing a join is surprisingly expensive for the DB to
do when room_membership table is larger than the disk cache.
This commit is contained in:
Erik Johnston 2019-07-17 15:33:37 +01:00
parent c831c5b2bb
commit 6de09e07a6
5 changed files with 41 additions and 20 deletions
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26
synapse/storage/events.py
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@ -918,8 +918,6 @@ class EventsStore(
min_stream_order = events_and_contexts[0][0].internal_metadata.stream_ordering
max_stream_order = events_and_contexts[-1][0].internal_metadata.stream_ordering
self._update_current_state_txn(txn, state_delta_for_room, min_stream_order)
self._update_forward_extremities_txn(
txn,
new_forward_extremities=new_forward_extremeties,
@ -993,6 +991,10 @@ class EventsStore(
backfilled=backfilled,
)
# We call this last as it assumes we've inserted the events into
# room_memberships, where applicable.
self._update_current_state_txn(txn, state_delta_for_room, min_stream_order)
def _update_current_state_txn(self, txn, state_delta_by_room, stream_id):
for room_id, current_state_tuple in iteritems(state_delta_by_room):
to_delete, to_insert = current_state_tuple
@ -1062,16 +1064,16 @@ class EventsStore(
),
)
self._simple_insert_many_txn(
txn,
table="current_state_events",
values=[
{
"event_id": ev_id,
"room_id": room_id,
"type": key[0],
"state_key": key[1],
}
# We include the membership in the current state table, hence we do
# a lookup when we insert. This assumes that all events have already
# been inserted into room_memberships.
txn.executemany(
"""INSERT INTO current_state_events
(room_id, type, state_key, event_id, membership)
VALUES (?, ?, ?, ?, (SELECT membership FROM room_memberships WHERE event_id = ?))
""",
[
(room_id, key[0], key[1], ev_id, ev_id)
for key, ev_id in iteritems(to_insert)
],
)