随着集群规模的扩大，集群系统失效的概率也在增加。

With the increase of the cluster scale, the probability of system fault is increasing.

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机架失效的概率要远低于节点失效；

The chance of rack failure is far less than that of node failure;

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机架失效的概率要远低于节点失效；

The chance of rack failure is far less than that of node failure;

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