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" Backlog tracker isn't updated correctly when facing a schema change, and may leak a SSTable if compaction strategy is changed, which causes backlog to be computed incorrectly. Most of these problems happen because sstable set and tracker are updated independently, so it could happen that tracker lose track (pun intended) of changes applied to set. The first patch will fix the leak when strategy is changed, and the third patch will make sure that tracker is updated atomically with sstable set, so these kind of problems will not happen anymore. Fixes #9157 " * 'fixes_to_backlog_tracker_v4' of github.com:raphaelsc/scylla: compaction: Update backlog tracker correctly when schema is updated compaction: Don't leak backlog of input sstable when compaction strategy is changed compaction: introduce compaction_read_monitor_generator::remove_exhausted_sstables() compaction: simplify removal of monitors