如何解决此类错误“显示不是会员”

Question

scala> us.show
<console>:32: error: value show is not a member of org.apache.spark.rdd.RDD[(Int, String)]
              us.show

Answer 1

org.apache.spark.rdd.RDD[(Int, String)]没有方法show()

您必须将数据框更改为

import spark.implicits._

us.toDF().show()

us.toDF("id", "name").show //You can provide the column name here 

希望这会有所帮助！

Answer 2

RDD没有显示为方法。您可以将rdd转换为数据帧或数据集。

import spark.implicits._

assuming spark is your spark session. 

您可以在RDD中使用take方法

 
rdd.take(10).foreach(println)
here it will take 10 records from rdd and will print the result.