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Merge pull request #1123 from matrix-org/erikj/public_room_cache

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Use stream_change cache to make get_forward_extremeties_for_room cache more effective
This commit is contained in:
Erik Johnston 2016-09-15 14:50:09 +01:00 committed by GitHub
commit 1535f21eb5
3 changed files with 19 additions and 2 deletions
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5
synapse/replication/slave/storage/events.py
View File

@ -173,7 +173,10 @@ class SlavedEventStore(BaseSlavedStore):
get_room_max_stream_ordering = DataStore.get_room_max_stream_ordering.__func__
get_forward_extremeties_for_room = (
EventFederationStore.__dict__["get_forward_extremeties_for_room"]
DataStore.get_forward_extremeties_for_room.__func__
)
_get_forward_extremeties_for_room = (
EventFederationStore.__dict__["_get_forward_extremeties_for_room"]
)
def stream_positions(self):

11
synapse/storage/event_federation.py
View File

@ -344,8 +344,17 @@ class EventFederationStore(SQLBaseStore):
self.get_latest_event_ids_in_room.invalidate, (room_id,)
)
@cached(max_entries=5000, num_args=2)
def get_forward_extremeties_for_room(self, room_id, stream_ordering):
# We want to make the cache more effective, so we clamp to the last
# change before the given ordering.
last_change = self._events_stream_cache.get_pos_of_last_change(room_id)
if last_change:
stream_ordering = min(last_change, stream_ordering)
return self._get_forward_extremeties_for_room(room_id, stream_ordering)
@cached(max_entries=5000, num_args=2)
def _get_forward_extremeties_for_room(self, room_id, stream_ordering):
"""For a given room_id and stream_ordering, return the forward
extremeties of the room at that point in "time".

5
synapse/util/caches/stream_change_cache.py
View File

@ -121,3 +121,8 @@ class StreamChangeCache(object):
k, r = self._cache.popitem()
self._earliest_known_stream_pos = max(k, self._earliest_known_stream_pos)
self._entity_to_key.pop(r, None)
def get_pos_of_last_change(self, entity):
"""Returns the stream pos of the last change for an entitiy, if known.
"""
return self._entity_to_key.get(entity, None)