Read text file from path:

val sc: org.apache.spark.SparkContext = ???
sc.textFile(path="/path/to/input/file") 

Read files using wildcards:

sc.textFile(path="/path/to/*/*") 

Read files specifying minimum number of partitions:

sc.textFile(path="/path/to/input/file", minPartitions=3)

Joins in Spark:

• Read textFile 1

  val txt1=sc.textFile(path="/path/to/input/file1") 
  

  Eg:

    A B
    1 2
    3 4
  

• Read textFile 2

  val txt2=sc.textFile(path="/path/to/input/file2") 
  

  Eg:

    A C
    1 5
    3 6
  

• Join and print the result.

  txt1.join(txt2).foreach(println)
  

  Eg:

    A B C
    1 2 5
    3 4 6
  

The join above is based on the first column.