idea显示toDF()没有这个函数,显示错误:Error:(82,8)value toDF is not a member of org.apache.spark.rdd.RDD[com.didichuxing.scala.BaseIndex]possible cause:maybe a semicolon is missing before `value toDF'?}).toDF()解决:增加一...
val lines=sc.textFile("data.txt")val lineLengths=lines.map(s=>s.length)val totalLength=lineLengths.reduce((a,b)=>a+b)通常,SparkRDD的常用操作有两种,分别为Transform操作和Action操作。Transform操作并不会立即执行,而是到了...
at org.apache.spark.rdd.RDD$anonfun$mapPartitionsInternal$1$anonfun$apply$25.apply(RDD.scala:830) at org.apache.spark.rdd.RDD$anonfun$mapPartitionsInternal$1$anonfun$apply$25.apply(RDD.scala:830) at ...
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:349) at org.apache.spark.rdd.RDD.iterator(RDD.scala:313) at ...
at org.apache.spark.rdd.MapPartitionsRDD.getPartitions(MapPartitionsRDD.scala:32) at org.apache.spark.rdd.RDD$anonfun$partitions$2.apply(RDD.scala:219) at org.apache.spark.rdd.RDD$anonfun$partitions$2...