注意：如果您没有看到数据均匀分布在多个节点上，那就说明您没有指定正确的分区键。
Note: If you do not see an even distribution of the data on the multiple nodes, that indicates that you have not identified the correct partitioning key.
节点非均匀分布策略能缓解无线传感器网络中的能量空洞问题。
The nonuniform node distribution strategy can be used to mitigate the energy hole problem in wireless sensor networks.
三分一个的副本放置在一个节点上，三分之二的副本放置在一个机架上，而另外三分之一均匀分布在剩余的机架上。
One third of replicas are on one node, two thirds of replicas are on one rack, and the other third are evenly distributed across the remaining racks.
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