From 3f5dd18bd44ae426d3b1ff062dd64acbad72f8ae Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Thu, 28 Jan 2016 18:11:41 +0000 Subject: [PATCH] If the same as the earliest key, assume nothing has changed. --- synapse/util/caches/stream_change_cache.py | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/synapse/util/caches/stream_change_cache.py b/synapse/util/caches/stream_change_cache.py index 22a9f8f46..c673b1bdf 100644 --- a/synapse/util/caches/stream_change_cache.py +++ b/synapse/util/caches/stream_change_cache.py @@ -49,6 +49,11 @@ class StreamChangeCache(object): cache_counter.inc_misses(self.name) return True + if stream_pos == self._earliest_known_stream_pos: + # If the same as the earliest key, assume nothing has changed. + cache_counter.inc_hits(self.name) + return False + latest_entity_change_pos = self._entity_to_key.get(entity, None) if latest_entity_change_pos is None: cache_counter.inc_misses(self.name)