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由 Yueh-Hsuan Chiang 提交于
Summary: Having if-then branch for different compaction strategies is considered hacky and make CompactionPicker less pluggable. This diff removes two of such if-then branches in version_set.cc by adding MaxInputLevel() to CompactionPicker. // Given the current number of levels, returns the lowest allowed level // for compaction input. virtual int MaxInputLevel(int current_num_levels) const; Test Plan: make db_test export ROCKSDB_TESTS=Compaction ./db_test Reviewers: igor, sdong, ljin Reviewed By: ljin Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D19971
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