how to read HDFS file in spark or Scala

How to read local file using scala is quite simple

import scala.io.source
object ReadLine {
  def main(args:Array[String]) {
    if (args.length>0) {
      for (line <- Source.fromLine(args(0)).getLine())
        println(line)
      }
    }

but when it come to read the file from hdfs its tricky

Spark :

If you want to read from hdfs then I would recommend to use spark where
you would have to use sparkContext.

below code will be helpful for  reading  HDFS file in spark or Scala

simple trick is :

val lines = sc.textFile(args(0))  //args(0) should be hdfs:///usr/local/log_data/file1

No Spark
If you don't want to use spark then you should go with BufferedReader or StreamReader or hadoop filesystem api.
for example

val hdfs = FileSystem.get(new URI("hdfs://yourUrl:port/"), new Configuration()) 
val path = new Path("/path/to/file/")
val stream = hdfs.open(path)
def readLines = Stream.cons(stream.readLine, Stream.continually( stream.readLine))

hope you got how to read  HDFS file in spark or Scala