我想解决该问题,但无法进一步进行。有人可以帮忙吗
import org.apache.hadoop.mapred.lib.MultipleTextOutputFormat
class KeyBasedOutput[T >: Null, V <: AnyRef] extends MultipleTextOutputFormat[T , V] {
override def generateFileNameForKeyValue(key: T, value: V, leaf: String) = {
key.toString
}
override def generateActualKey(key: T, value: V) = {
null
}
}
val cp1 =sqlContext.sql("select * from d_prev_fact").map(t => t.mkString("\t")).map{x => val parts = x.split("\t")
val partition_key = parts(3)
val rows = parts.slice(0, parts.length).mkString("\t")
("date=" + partition_key.toString, rows.toString)}
cp1.saveAsHadoopFile(FACT_CP)
我遇到如下错误并且无法调试
scala> cp1.saveAsHadoopFile(FACT_CP,classOf[String],classOf[String],classOf[KeyBasedOutput[String, String]])
java.lang.RuntimeException: java.lang.NoSuchMethodException: $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$KeyBasedOutput.<init>()
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:131)
at org.apache.hadoop.mapred.JobConf.getOutputFormat(JobConf.java:709)
at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopDataset(PairRDDFunctions.scala:742)
at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopFile(PairRDDFunctions.scala:674)
这个想法是根据键将值写入多个文件夹
将 KeyBasedOutput 放入 jar 并启动 Spark-shell --jars /path/to/the/jar
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