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由 Igor Canadi 提交于
Summary: This one is big. It adds ability to write to and read from different column families (see the unit test). It also supports recovery of different column families from log, which was the hardest part to reason about. We need to make sure to never delete the log file which has unflushed data from any column family. To support that, I added another concept, which is versions_->MinLogNumber() Test Plan: Added a unit test in column_family_test Reviewers: dhruba, haobo, sdong, kailiu CC: leveldb Differential Revision: https://reviews.facebook.net/D15537
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