来自Spark中PDF的文本

Question

我正在尝试使用pdfBox从hdfs的pdf文件中提取文本。

但是它会引发错误：

"Exception in thread "main" org.apache.spark.SparkException: ...
java.io.FileNotFoundException: /nnAlias:8020/tmp/sample.pdf 
(No such file or directory)"

我想念什么？我应该使用PortableDataStream而不是以下内容的字符串部分吗？

val files: RDD[(String, PortableDataStream)]？

def pdfRead(fileNameFromRDD: (String, PortableDataStream), sparkSession: SparkSession) = {
val file: File = new File(fileNameFromRDD._1.drop(5))
val document = PDDocument.load(file); //It throws an error here.

if (!document.isEncrypted()) {
  val stripper = new PDFTextStripper()
  val text = stripper.getText(document)
  println("Text:" + text)

}
    document.close()

  }

//This is where I call the above pdf to text converter method.
     val files = sparkSession.sparkContext.binaryFiles("hdfs://nnAlias:8020/tmp/sample.pdf")
    files.foreach(println)

    files.foreach(f => println(f._1))

    files.foreach(fileStream => pdfRead(fileStream, sparkSession))