将副本定位索引信息平均分布在多个索引结点上，并且能够自适应索引结点的动态加入或退出；
Replica location index information are spread evenly on index nodes which can adapt to the joining or departing of index nodes.
然而有的索引不包含所有的元素结点，因而在进行查询时许多路径仍需要检测；
Nevertheless, some indices do not contain all element nodes, many paths need to still be examined in the query;
然而有的索引不包含所有的元素结点，因而在进行查询时许多路径仍需要检测；
Nevertheless, some indices do not contain all element nodes, many paths need to still be examined in the query;
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