世界上没有简单的方法 dbutils 返回目录的大小或目录中的文件数。但是，可以递归地迭代目录进行计算。
1递归计算的文件数：

import scala.annotation.tailrec
import com.databricks.backend.daemon.dbutils.FileInfo
import com.databricks.dbutils_v1

private lazy val dbutils = dbutils_v1.DBUtilsHolder.dbutils

def numberOfFiles(location: String): Int = {
  @tailrec
  def go(items: List[FileInfo], result: Int): Int = items match {
    case head :: tail =>
      val files = dbutils.fs.ls(head.path)
      val directories = files.filter(_.isDir)
      go(tail ++ directories, result + files.size)
    case _ => result
  }

  go(dbutils.fs.ls(location).toList, 0)
}

2文件夹的总大小

import com.databricks.backend.daemon.dbutils.FileInfo

def sizeOfDirectory(location: String): Long = {
  @tailrec
  def go(items: List[FileInfo], result: Long): Long = items match {
    case head :: tail =>
      val files = dbutils.fs.ls(head.path)
      val directories = files.filter(_.isDir)
      val updated = files.map(_.size).foldLeft(result)(_ + _)
      go(tail ++ directories, updated)
    case _ => result
  }

  go(dbutils.fs.ls(location).toList, 0)
}

我希望这有帮助