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    用户写入root.sg1.d1.s1, root.sg1.d2.s1, root.sg1.d3.s1, root.sg2.d1.s1, root.sg2.d2.s1五条序列,假设在给定的hash函数下root.sg1.d1映射为0, root.sg1.d2映射为1, root.sg1.d2映射为0,root.sg2.d1映射为0,root.sg2.d2映射为1,给定逻辑存储组数量为2,虚拟存储组数量也为2。d2映射为1,给定逻辑存储组数量为2,虚拟存储组数量也为2,假设写入数据均为顺序写入。

1.2 方案一目录结构(简洁起见,不考虑时间分区)

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