Add to slave store

synapse/replication/slave/storage/events.py

@@ -123,6 +123,11 @@ class SlavedEventStore(BaseSlavedStore):
     get_state_groups_ids = DataStore.get_state_groups_ids.__func__
     get_state_ids_for_event = DataStore.get_state_ids_for_event.__func__
     get_state_ids_for_events = DataStore.get_state_ids_for_events.__func__
+    get_joined_users_from_context = DataStore.get_joined_users_from_context.__func__
+    _get_joined_users_from_context = (
+        RoomMemberStore.__dict__["_get_joined_users_from_context"]
+    )
+
     get_recent_events_for_room = DataStore.get_recent_events_for_room.__func__
     get_room_events_stream_for_rooms = (
         DataStore.get_room_events_stream_for_rooms.__func__