RocksDB 4.0 发布，key
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新特性
[*] Added support for transactions. See include/rocksdb/utilities/transaction.h for more info.
[*] DB::GetProperty() now accepts "rocksdb.aggregated-table-properties" and "rocksdb.aggregated-table-properties-at-levelN", in which case it returns aggregated table properties of the target column family, or the aggregated table properties of the specified level N if the "at-level" version is used.
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Add compression option kZSTDNotFinalCompression for people to experiment ZSTD>
[*] We removed the need for LATEST_BACKUP file in BackupEngine. We stillkeep writing it when we create new backups (because of backward compatibility), but we don't read it anymore.
公共 API 变化
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Removed>
[*] Renamed DBOptions.num_subcompactions to DBOptions.max_subcompactionsto make the name better match the actual functionality of the option.
[*] Added Equal() method to the Comparator interface that can optionallybe overwritten in cases where equality comparisons can be done more efficiently than three-way comparisons.
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Previous 'experimental' OptimisticTransaction>
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