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There is a bug with the `StreamChangeCache` where it would incorrectly return that all entities had changed if asked for entities changed *since* the earliest stream position. Note that for streams we use the inequalities: `$min_stream_id < stream_id <= $max_stream_id`, i.e. when we ask the stream change cache for all things that have changed since `$stream_id` we don't care for events that happened *at* `$stream_id`. Specifically: `_earliest_known_stream_pos` is the position at which we know that we'll have entries for all changes since that point, we can use the cache for any stream IDs that equal `_earliest_known_stream_pos`. `_earliest_known_stream_pos` is set in three places: - On startup we set it either to: - the current maximum stream ID, with not prefilled values; or - the minimum of the latest N values we pulled from the DB - When we evict items from the bottom, we set it to the stream ID of the evicted items. This was changed in https://github.com/matrix-org/synapse/pull/14435, but I think we were overly conservative there. --------- Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com> |
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| .. | ||
| api | ||
| app | ||
| appservice | ||
| config | ||
| crypto | ||
| events | ||
| federation | ||
| handlers | ||
| http | ||
| logging | ||
| media | ||
| metrics | ||
| module_api | ||
| push | ||
| replication | ||
| rest | ||
| scripts | ||
| server_notices | ||
| state | ||
| storage | ||
| test_utils | ||
| types | ||
| util | ||
| __init__.py | ||
| server.py | ||
| test_distributor.py | ||
| test_event_auth.py | ||
| test_federation.py | ||
| test_mau.py | ||
| test_phone_home.py | ||
| test_rust.py | ||
| test_server.py | ||
| test_state.py | ||
| test_terms_auth.py | ||
| test_test_utils.py | ||
| test_types.py | ||
| test_visibility.py | ||
| unittest.py | ||
| utils.py | ||