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Merge pull request #3521 from matrix-org/rav/optimise_stream_change_cache
Reduce set building in get_entities_changed
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changelog.d/3521.feature
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changelog.d/3521.feature
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Cache optimisation for /sync requests
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@ -74,14 +74,18 @@ class StreamChangeCache(object):
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assert type(stream_pos) is int
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if stream_pos >= self._earliest_known_stream_pos:
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not_known_entities = set(entities) - set(self._entity_to_key)
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changed_entities = {
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self._cache[k] for k in self._cache.islice(
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start=self._cache.bisect_right(stream_pos),
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)
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}
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result = (
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{self._cache[k] for k in self._cache.islice(
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start=self._cache.bisect_right(stream_pos))}
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.intersection(entities)
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.union(not_known_entities)
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)
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# we need to include entities which we don't know about, as well as
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# those which are known to have changed since the stream pos.
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result = {
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e for e in entities
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if e in changed_entities or e not in self._entity_to_key
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}
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self.metrics.inc_hits()
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else:
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