[Backport 5.4] : compaction: improve partition estimates when using garbage collected sstables #18656
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When a compaction strategy uses garbage collected sstables to track expired tombstones, do not use complete partition estimates for them, instead, use a fraction of it based on the droppable tombstone ratio estimate.
Fixes #18283
Signed-off-by: Lakshmi Narayanan Sreethar lakshmi.sreethar@scylladb.com
Closes #18465
(cherry picked from commit d39adf6)