值 toDF 不是 org.apache.spark.rdd.RDD 的成员 [英] value toDF is not a member of org.apache.spark.rdd.RDD
问题描述
我已经在其他 SO 帖子中读到过这个问题,但我仍然不知道我做错了什么.原则上,添加这两行:
I've read about this issue in other SO posts and I still don't know what I'm doing wrong. In principle, adding these two lines:
val sqlContext = new org.apache.spark.sql.SQLContext(sc)
import sqlContext.implicits._
应该已经完成了,但错误仍然存在
should have done the trick but the error persists
这是我的 build.sbt:
This my build.sbt:
name := "PickACustomer"
version := "1.0"
scalaVersion := "2.11.7"
libraryDependencies ++= Seq("com.databricks" %% "spark-avro" % "2.0.1",
"org.apache.spark" %% "spark-sql" % "1.6.0",
"org.apache.spark" %% "spark-core" % "1.6.0")
我的Scala代码是:
and my scala code is:
import scala.collection.mutable.Map
import scala.collection.immutable.Vector
import org.apache.spark.rdd.RDD
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf
import org.apache.spark.sql._
object Foo{
def reshuffle_rdd(rawText: RDD[String]): RDD[Map[String, (Vector[(Double, Double, String)], Map[String, Double])]] = {...}
def do_prediction(shuffled:RDD[Map[String, (Vector[(Double, Double, String)], Map[String, Double])]], prediction:(Vector[(Double, Double, String)] => Map[String, Double]) ) : RDD[Map[String, Double]] = {...}
def get_match_rate_from_results(results : RDD[Map[String, Double]]) : Map[String, Double] = {...}
def retrieve_duid(element: Map[String,(Vector[(Double, Double, String)], Map[String,Double])]): Double = {...}
def main(args: Array[String]){
val conf = new SparkConf().setAppName(this.getClass.getSimpleName)
if (!conf.getOption("spark.master").isDefined) conf.setMaster("local")
val sc = new SparkContext(conf)
//This should do the trick
val sqlContext = new org.apache.spark.sql.SQLContext(sc)
import sqlContext.implicits._
val PATH_FILE = "/mnt/fast_export_file_clean.csv"
val rawText = sc.textFile(PATH_FILE)
val shuffled = reshuffle_rdd(rawText)
// PREDICT AS A FUNCTION OF THE LAST SEEN UID
val results = do_prediction(shuffled.filter(x => retrieve_duid(x) > 1) , predict_as_last_uid)
results.cache()
case class Summary(ismatch: Double, t_to_last:Double, nflips:Double,d_uid: Double, truth:Double, guess:Double)
val summary = results.map(x => Summary(x("match"), x("t_to_last"), x("nflips"), x("d_uid"), x("truth"), x("guess")))
//PROBLEMATIC LINE
val sum_df = summary.toDF()
}
}
我总是得到:
value toDF 不是 org.apache.spark.rdd.RDD[Summary] 的成员
value toDF is not a member of org.apache.spark.rdd.RDD[Summary]
现在有点丢失了.有什么想法吗?
Bit lost now. Any ideas?
推荐答案
将案例类移到 main
之外:
Move your case class outside of main
:
object Foo {
case class Summary(ismatch: Double, t_to_last:Double, nflips:Double,d_uid: Double, truth:Double, guess:Double)
def main(args: Array[String]){
...
}
}
关于它的范围的一些事情阻止了 Spark 能够处理 Summary
模式的自动派生.仅供参考,我实际上从 sbt
得到了不同的错误:
Something about the scoping of it is preventing Spark from being able to handle the automatic derivation of the schema for Summary
. FYI I actually got a different error from sbt
:
没有可用于摘要的 TypeTag
No TypeTag available for Summary
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