c++ - leveldb DeleteObsoleteFiles 是私有的

Question

有谁知道为什么 DeleteObsoleteFiles 成员函数在 leveldb 中是私有的？在某些情况下，我需要释放一些磁盘空间，其中一种方法是尝试删除 leveldb 过时的文件。那么我可以将其公开并安全调用吗？

Answer 1

压缩后文件变得“过时”：

DeleteObsoleteFiles()在每次压缩结束和恢复结束时调用。它查找数据库中所有文件的名称。它删除所有不是当前日志文件的日志文件。它会删除所有未从某个级别引用且不是活动压缩的输出的表文件。

如果要减少占用的磁盘空间，可以运行压缩

  // Compact the underlying storage for the key range [*begin,*end].
  // In particular, deleted and overwritten versions are discarded,
  // and the data is rearranged to reduce the cost of operations
  // needed to access the data.  This operation should typically only
  // be invoked by users who understand the underlying implementation.
  //
  // begin==NULL is treated as a key before all keys in the database.
  // end==NULL is treated as a key after all keys in the database.
  // Therefore the following call will compact the entire database:
  //    db->CompactRange(NULL, NULL);
  virtual void CompactRange(const Slice* begin, const Slice* end)