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If the same as the earliest key, assume nothing has changed.

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This commit is contained in:
Erik Johnston 2016-01-28 18:11:41 +00:00
parent 40431251cb
commit 3f5dd18bd4
1 changed files with 5 additions and 0 deletions
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5
synapse/util/caches/stream_change_cache.py
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@ -49,6 +49,11 @@ class StreamChangeCache(object):
cache_counter.inc_misses(self.name) cache_counter.inc_misses(self.name)
return True 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) latest_entity_change_pos = self._entity_to_key.get(entity, None)
if latest_entity_change_pos is None: if latest_entity_change_pos is None:
cache_counter.inc_misses(self.name) cache_counter.inc_misses(self.name)