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" After data segregation feature, anything that cause out-of-order writes, like read repair, can result in small updates to past time windows. This causes compaction to be very aggressive because whenever a past time window is updated like that, that time window is recompacted into a single SSTable. Users expect that once a window is closed, it will no longer be written to, but that has changed since the introduction of the data segregation future. We didn't anticipate the write amplification issues that the feature would cause. To fix this problem, let's perform size-tiered compaction on the windows that are no longer active and were updated because data was segregated. The current behavior where the last active window is merged into one file is kept. But thereafter, that same window will only be compacted using STCS. Fixes #6928. " * 'fix_twcs_agressiveness_after_data_segregation_v2' of github.com:raphaelsc/scylla: compaction/twcs: improve further debug messages compaction/twcs: Improve debug log which shows all windows test: Check that TWCS properly performs size-tiered compaction on past windows compaction/twcs: Make task estimation take into account the size-tiered behavior compaction/stcs: Export static function that estimates pending tasks compaction/stcs: Make get_buckets() static compact/twcs: Perform size-tiered compaction on past time windows compaction/twcs: Make strategy easier to extend by removing duplicated knowledge compaction/twcs: Make newest_bucket() non-static compaction/twcs: Move TWCS implementation into source file