CompactionPri = kMinOverlappingRatio also uses compensated file size (#4907)
Summary: Right now, CompactionPri = kMinOverlappingRatio provides best write amplification, but it doesn't prioritize files with more tombstones. We combine the two good features: make kMinOverlappingRatio to boost files with lots of tombstones too. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4907 Differential Revision: D13788774 Pulled By: siying fbshipit-source-id: 1991cbb495fb76c8b529de69896e38d81ed9d9b3
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