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Merge pull request #3521 from matrix-org/rav/optimise_stream_change_cache

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Reduce set building in get_entities_changed
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Richard van der Hoff 2018-07-12 12:08:49 +01:00 committed by GitHub
commit 6dff49b8a9
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2 changed files with 12 additions and 7 deletions
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1
changelog.d/3521.feature Normal file
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@ -0,0 +1 @@
Cache optimisation for /sync requests

18
synapse/util/caches/stream_change_cache.py
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@ -74,14 +74,18 @@ class StreamChangeCache(object):
assert type(stream_pos) is int
if stream_pos >= self._earliest_known_stream_pos:
not_known_entities = set(entities) - set(self._entity_to_key)
changed_entities = {
self._cache[k] for k in self._cache.islice(
start=self._cache.bisect_right(stream_pos),
)
}
result = (
{self._cache[k] for k in self._cache.islice(
start=self._cache.bisect_right(stream_pos))}
.intersection(entities)
.union(not_known_entities)
)
# we need to include entities which we don't know about, as well as
# those which are known to have changed since the stream pos.
result = {
e for e in entities
if e in changed_entities or e not in self._entity_to_key
}
self.metrics.inc_hits()
else: