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由 Igor Canadi 提交于
Summary: Added an option to BackupableDB implementation that allows users to persist in-memory databases. When the restore happens with keep_log_files = true, it will *) Not delete existing log files in wal_dir *) Move log files from archive directory to wal_dir, so that DB can replay them if necessary Test Plan: Added an unit test Reviewers: dhruba, ljin Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D16941
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