Spark Scala list folders in directory

Question

I want to list all folders within a hdfs directory using Scala/Spark. In Hadoop I can do this by using the command: hadoop fs -ls hdfs://sandbox.hortonworks.com/demo/<

Answer 1

object HDFSProgram extends App {    
  val uri = new URI("hdfs://HOSTNAME:PORT")    
  val fs = FileSystem.get(uri,new Configuration())    
  val filePath = new Path("/user/hive/")    
  val status = fs.listStatus(filePath)    
  status.map(sts => sts.getPath).foreach(println)    
}

This is sample code to get list of hdfs files or folder present under /user/hive/

Answer 2

val spark = SparkSession.builder().appName("Demo").getOrCreate()
val path = new Path("enter your directory path")
val fs:FileSystem = projects.getFileSystem(spark.sparkContext.hadoopConfiguration)
val it = fs.listLocatedStatus(path)

This will create an iterator it over org.apache.hadoop.fs.LocatedFileStatus that is your subdirectory

Answer 3

We are using hadoop 1.4 and it doesn't have listFiles method so we use listStatus to get directories. It doesn't have recursive option but it is easy to manage recursive lookup.

val fs = FileSystem.get(new Configuration())
val status = fs.listStatus(new Path(YOUR_HDFS_PATH))
status.foreach(x=> println(x.getPath))