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由 Maysam Yabandeh 提交于
Summary: This patch refactors TransactionImpl by separating the logic for pessimistic concurrency control from the implementation of how to write the data to rocksdb. The existing implementation is named WriteCommittedTxnImpl as it writes committed data to the db. A template named WritePreparedTxnImpl is also added which will be later completed to provide a an alternative implementation. Closes https://github.com/facebook/rocksdb/pull/2676 Differential Revision: D5549998 Pulled By: maysamyabandeh fbshipit-source-id: 16298e86b43ca4849324c1f35c731913c6d17bec
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