FileUtil.fullyDeleteContents不起作用

Question

我写过一个剧本。它应该将某些类型的文件从某些目录复制到其他目录（它应该事先清理）。它复制了所有内容，但没有清理目录。没有错误或遗漏。

import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs.{FileSystem, Path, FileUtil}

val conf = new Configuration()
val fs = FileSystem.get(conf)

val listOfFileTypes = List("mta", "rcr", "sub")
val listOfPlatforms = List("B", "C", "H", "M", "Y")

for(fileType <- listOfFileTypes){
  FileUtil.fullyDeleteContents(new File("/apps/hive/warehouse/soc.db/fct_evkuzmin/file_" + fileType))
  for (platform <- listOfPlatforms) {
    var srcPaths = fs.globStatus(new Path("/user/com/data/" + "20170404" + "_" + platform + "/*" + fileType + ".gz"))
    var dstPath = new Path("/apps/hive/warehouse/soc.db/fair_usage/fct_evkuzmin/file_" + fileType)

    for(srcPath <- srcPaths){
      println("copying " + srcPath.getPath.toString)
      FileUtil.copy(fs, srcPath.getPath, fs, dstPath, false, conf)
    }
  }
}

为什么FileUtil.fullyDeleteContents不起作用？