Question

我有一个RDD，我使用map：

从DataFrame转向

case class Record(id_1: Int, fnam_1: String, lnam_1: String, id_2: Long, fnam_2: String, lnam_2: String)
val rdd = df.map {
  case Row(id_1: Int, fnam_1: String, lnam_1: String, id_2: Long, fnam_2: String, lnam_2: String) =>
    Record(id_1, fnam_1, lnam_1, id_2, fnam_2, lnam_2)
}

然后我使用java语音匹配库对此rdd执行过滤操作（如下所示）：

import edu.ualr.oyster.utilities.DoubleMetaphone

def matchFirstName(rec: Record) = {
  val s1 = Option(rec.fnam_1).getOrElse("")
  val s2 = Option(rec.fnam_2).getOrElse("")
  if (s1.isEmpty || s2.isEmpty)
    false
  else
    new DoubleMetaphone().compareDoubleMetaphone(s1, s2)
}

val rdd_filtered = rdd.filter(matchFirstName(_))

当我运行这个时，我收到一个NPE错误：

17/04/06 19:06:31 WARN scheduler.TaskSetManager: Lost task 0.0 in stage 4.0 (TID 160, my.work.cluster.com): java.lang.NullPointerException
    at edu.ualr.oyster.utilities.DoubleMetaphone.compareDoubleMetaphone(DoubleMetaphone.java:1020)
    at funpackage.EntityResolution$.phoneticMatching(EntityResolution.scala:106)
    at esurance.EntityResolution$.esurance$EntityResolution$$matchNames$1(EntityResolution.scala:118)
    at esurance.EntityResolution$$anonfun$8.apply(EntityResolution.scala:137)
    at esurance.EntityResolution$$anonfun$8.apply(EntityResolution.scala:137)
    at scala.collection.Iterator$$anon$14.hasNext(Iterator.scala:390)
    at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)
    at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)
    at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:308)
    at scala.collection.Iterator$class.foreach(Iterator.scala:727)
    at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
    at scala.collection.generic.Growable$class.$plus$plus$eq(Growable.scala:48)
    at scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:103)
    at scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:47)
    at scala.collection.TraversableOnce$class.to(TraversableOnce.scala:273)
    at scala.collection.AbstractIterator.to(Iterator.scala:1157)
    at scala.collection.TraversableOnce$class.toBuffer(TraversableOnce.scala:265)
    at scala.collection.AbstractIterator.toBuffer(Iterator.scala:1157)
    at scala.collection.TraversableOnce$class.toArray(TraversableOnce.scala:252)
    at scala.collection.AbstractIterator.toArray(Iterator.scala:1157)
    at org.apache.spark.sql.execution.SparkPlan$$anonfun$5.apply(SparkPlan.scala:215)
    at org.apache.spark.sql.execution.SparkPlan$$anonfun$5.apply(SparkPlan.scala:215)
    at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1850)
    at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1850)
    at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)
    at org.apache.spark.scheduler.Task.run(Task.scala:88)
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

我尝试在项目中的一对字符串上使用语音匹配，它确实可以正常工作。我还在用户定义函数中包含的spark sql中使用了相同的库，没有任何问题。我怀疑这个问题可能是因为我的某些值可能会丢失（null）。但我尝试用那里的Option处理这个问题。知道为什么会失败吗？

Answer 1

我没有尝试深入edu.ualr.oyster库以查看它是否导致异常。但似乎是这样。我切换到使用org.apache.commons.codec.language库（相同的双元电话功能），程序在spark上运行没有问题。

当使用java语音匹配库将rdd映射到空值

1 个答案: