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// Release the input version for the compaction, once the compaction		// Release the input version for the compaction, once the compaction
// is successful.		// is successful.
void ReleaseInputs();		void ReleaseInputs();

private:		private:
friend class Version;		friend class Version;
friend class VersionSet;		friend class VersionSet;

explicit Compaction(int level);		Compaction(const Options* options, int level);

int level_;		int level_;
uint64_t max_output_file_size_;		uint64_t max_output_file_size_;
Version* input_version_;		Version* input_version_;
VersionEdit edit_;		VersionEdit edit_;

// Each compaction reads inputs from "level_" and "level_+1"		// Each compaction reads inputs from "level_" and "level_+1"
std::vector<FileMetaData*> inputs_[2]; // The two sets of inputs		std::vector<FileMetaData*> inputs_[2]; // The two sets of inputs
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