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e5a0b05c15
Currently, compaction only replace input sstables at end of compaction, meaning compaction must be finished for all the space of those sstables to be released. What we can do instead is to delete earlier some input sstable under some conditions: 1) SStable data should be committed to a new, sealed output sstable, meaning it's exhausted. 2) Exhausted sstable mustn't overlap with a non-exhausted sstable because a tombstone in the exhausted could have been purged and the shadowed data in non-exhausted could be ressurected if system crashes. Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>