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Speed up fetching device lists changes in sync.

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Currently we copy `users_who_share_room` needlessly about three times,
which is expensive when the set is large (which it can easily be).
This commit is contained in:
Erik Johnston 2020-05-05 17:07:59 +01:00
parent b2dba06079
commit f9073893af
3 changed files with 24 additions and 9 deletions
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4
synapse/storage/data_stores/main/devices.py
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@ -541,8 +541,8 @@ class DeviceWorkerStore(SQLBaseStore):
# Get set of users who *may* have changed. Users not in the returned
# list have definitely not changed.
to_check = list(
self._device_list_stream_cache.get_entities_changed(user_ids, from_key)
to_check = self._device_list_stream_cache.get_entities_changed(
user_ids, from_key
)
if not to_check: