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Sliding Sync: Fix _bulk_get_max_event_pos(...) being inefficient (#17728)

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Fix `_bulk_get_max_event_pos(...)` being inefficient. It kept adding all
of the `batch_results` to the `results` over and over every time we
checked a single room in the batch.

I think we still ended up with the right answer before because we
accumulate `recheck_rooms` and actually recheck them to overwrite the
bad data we wrote to the `results` before.

Introduced in
https://github.com/element-hq/synapse/pull/17606/files#diff-cbd54e4b5a2a1646299d659a2d5884d6cb14e608efd2e1658e72b465bb66e31bR1481
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Eric Eastwood 2024-09-19 03:32:16 -05:00 committed by GitHub
parent af998e6c66
commit faf5b40520
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2 changed files with 2 additions and 1 deletions
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1
changelog.d/17728.misc Normal file
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@ -0,0 +1 @@
Fix `_bulk_get_max_event_pos` being inefficient.

2
synapse/storage/databases/main/stream.py
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@ -1584,7 +1584,7 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
)
for room_id, stream_ordering in batch_results.items():
if stream_ordering <= now_token.stream:
results.update(batch_results)
results[room_id] = stream_ordering
else:
recheck_rooms.add(room_id)