error:value reduceByKey is not a member of Array[(String, Int)]
Scala報錯value reduceByKey is not a member of Array[(String, Int)]
1.原因在於在spark中,使用scala程式設計時,沒有使用pairRDD
。
2.錯誤程式碼示例:
val book = Array(("spark",2),("hadoop",6),("hadoop",4),("spark",6))
val result = book.reduceByKey(_+_)
3.修正如下:
val book = Array(("spark",2),("hadoop",6),("hadoop",4),("spark",6 ))
val rdd = sc.parallelize(book)
val result = book.reduceByKey(_+_)
4.原理分析:【待整理】
- 什麼是pairRDD
- 為什麼需要sc.parallelize()?
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