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      <title>宽依赖窄依赖总结</title>
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      <description>宽依赖与窄依赖 窄依赖（narrow dependency）和宽依赖（wide dependency, 也称 shuffle dependency）. 窄依赖是指父RDD的每个分区只被子RDD的一个分区所使用， 子RDD分区通常对应常数个父RDD分区(O(1)，与数据规模无关), map/filter和union 相应的，宽依赖是</description>
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