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由 Igor Canadi 提交于
Summary: With multiple column families, especially when manual Flush is executed, we might roll the log file, although the current log file is empty (no data has been written to the log). After the diff, we won't create new log file if current is empty. Next, I will write an algorithm that will flush column families that reference old log files (i.e., that weren't flushed in a while) Test Plan: Added an unit test. Confirmed that unit test failes in master Reviewers: dhruba, haobo, ljin, sdong Reviewed By: ljin CC: leveldb Differential Revision: https://reviews.facebook.net/D17631
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