Spark API 詳解/大白話解釋 之 groupBy、groupByKey

groupBy(function) function返回key，傳入的RDD的各個元素根據這個key進行分組python val a = sc.parallelize(1 to 9, 3) a.groupBy(x => { if (x % 2 == 0) "even" else "odd" }).collect//分紅兩組 /*結果 Array( (even,ArrayBuffer(2, 4, 6

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