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Merge remote-tracking branch 'origin/erikj/stream_change_cache' into anoa/configure_workers_updates

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This commit is contained in:
Olivier 'reivilibre 2024-09-27 15:29:02 +01:00
commit be472547bb
3 changed files with 19 additions and 14 deletions
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1
changelog.d/17767.misc Normal file
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@ -0,0 +1 @@
Fix perf when streams don't change often.

14
synapse/util/caches/stream_change_cache.py
View file

@ -142,9 +142,9 @@ class StreamChangeCache:
"""
assert isinstance(stream_pos, int)
# _cache is not valid at or before the earliest known stream position, so
# _cache is not valid before the earliest known stream position, so
# return that the entity has changed.
if stream_pos <= self._earliest_known_stream_pos:
if stream_pos < self._earliest_known_stream_pos:
self.metrics.inc_misses()
return True
@ -186,7 +186,7 @@ class StreamChangeCache:
This will be all entities if the given stream position is at or earlier
than the earliest known stream position.
"""
if not self._cache or stream_pos <= self._earliest_known_stream_pos:
if not self._cache or stream_pos < self._earliest_known_stream_pos:
self.metrics.inc_misses()
return set(entities)
@ -238,9 +238,9 @@ class StreamChangeCache:
"""
assert isinstance(stream_pos, int)
# _cache is not valid at or before the earliest known stream position, so
# _cache is not valid before the earliest known stream position, so
# return that an entity has changed.
if stream_pos <= self._earliest_known_stream_pos:
if stream_pos < self._earliest_known_stream_pos:
self.metrics.inc_misses()
return True
@ -270,9 +270,9 @@ class StreamChangeCache:
"""
assert isinstance(stream_pos, int)
# _cache is not valid at or before the earliest known stream position, so
# _cache is not valid before the earliest known stream position, so
# return None to mark that it is unknown if an entity has changed.
if stream_pos <= self._earliest_known_stream_pos:
if stream_pos < self._earliest_known_stream_pos:
return AllEntitiesChangedResult(None)
changed_entities: List[EntityType] = []

18
tests/util/test_stream_change_cache.py
View file

@ -53,8 +53,8 @@ class StreamChangeCacheTests(unittest.HomeserverTestCase):
# return True, whether it's a known entity or not.
self.assertTrue(cache.has_entity_changed("user@foo.com", 0))
self.assertTrue(cache.has_entity_changed("not@here.website", 0))
self.assertTrue(cache.has_entity_changed("user@foo.com", 3))
self.assertTrue(cache.has_entity_changed("not@here.website", 3))
self.assertTrue(cache.has_entity_changed("user@foo.com", 2))
self.assertTrue(cache.has_entity_changed("not@here.website", 2))
def test_entity_has_changed_pops_off_start(self) -> None:
"""
@ -76,9 +76,11 @@ class StreamChangeCacheTests(unittest.HomeserverTestCase):
self.assertTrue("user@foo.com" not in cache._entity_to_key)
self.assertEqual(
cache.get_all_entities_changed(3).entities, ["user@elsewhere.org"]
cache.get_all_entities_changed(2).entities,
["bar@baz.net", "user@elsewhere.org"],
)
self.assertFalse(cache.get_all_entities_changed(2).hit)
self.assertFalse(cache.get_all_entities_changed(1).hit)
self.assertTrue(cache.get_all_entities_changed(2).hit)
# If we update an existing entity, it keeps the two existing entities
cache.entity_has_changed("bar@baz.net", 5)
@ -89,7 +91,8 @@ class StreamChangeCacheTests(unittest.HomeserverTestCase):
cache.get_all_entities_changed(3).entities,
["user@elsewhere.org", "bar@baz.net"],
)
self.assertFalse(cache.get_all_entities_changed(2).hit)
self.assertFalse(cache.get_all_entities_changed(1).hit)
self.assertTrue(cache.get_all_entities_changed(2).hit)
def test_get_all_entities_changed(self) -> None:
"""
@ -114,7 +117,8 @@ class StreamChangeCacheTests(unittest.HomeserverTestCase):
self.assertEqual(
cache.get_all_entities_changed(3).entities, ["user@elsewhere.org"]
)
self.assertFalse(cache.get_all_entities_changed(1).hit)
self.assertFalse(cache.get_all_entities_changed(0).hit)
self.assertTrue(cache.get_all_entities_changed(1).hit)
# ... later, things gest more updates
cache.entity_has_changed("user@foo.com", 5)
@ -149,7 +153,7 @@ class StreamChangeCacheTests(unittest.HomeserverTestCase):
# With no entities, it returns True for the past, present, and False for
# the future.
self.assertTrue(cache.has_any_entity_changed(0))
self.assertTrue(cache.has_any_entity_changed(1))
self.assertFalse(cache.has_any_entity_changed(1))
self.assertFalse(cache.has_any_entity_changed(2))
# We add an entity