RocksDB 4.0 发布，key

11lxm

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　　RocksDB 4.0 发布，更新内容如下：
　　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.
  
• 
  　　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

• 
  　　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.
  
• 
  　　Previous 'experimental' OptimisticTransaction>
  

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