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大致流程

  • 空间内合并的文件选择
    • 空间内合并是从低层向高层搜索某层若满足连续10个文件或文件总大小超过2G则将该批文件封装到一个合并任务里,因此一次搜索某层可能出现好几批待合并文件,分别封装成好几个合并任务

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