24-3-15-hotfix: Preliminary fix for erase cache consistency problems #13948
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Changelog entry
Fixed consistency issues related to caching deleted ranges.
Changelog category
Additional information
Several issues have been identified using a new jepsen workload that produces and tests deleted rows. The root cause is due to datashard transaction map remapping already committed or rolled back transactions to different committed versions, which doesn't affect correctness when replying to requests (datashards use transaction observers to filter inconsistent results), but confuses LocalDB when it uses these remapped versions for caching.
This temporary fix avoids caching over uncompacted deltas so it's easier to backport.
Fixes KIKIMR-22506.