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由 Igor Canadi 提交于
Summary: ReadFirstRecord() reads the actual log file from disk on every call. This diff introduces a cache layer on top of ReadFirstRecord(), which should significantly speed up repeated calls to GetUpdatesSince(). I also cleaned up some stuff, but the whole TransactionLogIterator could use some refactoring, especially if we see increased usage. Test Plan: make check Reviewers: haobo, sdong, dhruba Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D18387
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