第137课： Spark面试经典系列之数据倾斜解决之Map 端Reduce及问题思考

段智华发布时间：2016-07-05 20:29:38 ，浏览量：4

第137课： Spark面试经典系列之数据倾斜解决之Map 端Reduce及问题思考 1 spark 数据倾斜解决之map端reduce

2 map 端reduce 的问题思考

看一个join的例子

上面的join怎么计算出来的呢？粉丝请看这个：先做cogroup然后 join用了笛卡尔积

如果发生了数据倾斜，假设一个情况大rdd和小rdd

解决方式：RDD1使

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第137课： Spark面试经典系列之数据倾斜解决之Map 端Reduce及问题思考

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