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Please follow the style of the existing codebase. Apache Spark follows the official Scala style guide, but with the following changes:

Table of Contents

Line Length

Limit lines to 100 characters. The only exceptions are import statements (although even for those, try to keep them under 100 chars).

Indentation

Use 2-space indentation in general. For function declarations, use 4 space indentation for its parameters when they don't fit in a single line. For example:

Code Block
scala
scala

// Correct:
if (true) {
  println("Wow!")
}

// Wrong:
if (true) {
    println("Wow!")
}

// Correct:
def newAPIHadoopFile[K, V, F <: NewInputFormat[K, V]](
    path: String,
    fClass: Class[F],
    kClass: Class[K],
    vClass: Class[V],
    conf: Configuration = hadoopConfiguration): RDD[(K, V)] = {
  // function body
}

// Wrong 
def newAPIHadoopFile[K, V, F <: NewInputFormat[K, V]](
  path: String,
  fClass: Class[F],
  kClass: Class[K],
  vClass: Class[V],
  conf: Configuration = hadoopConfiguration): RDD[(K, V)] = {
  // function body
}

...

Put curly braces even around one-line if, else or loop statements. The only exception is if you are using if/else as an one-line ternary operator.

Code Block
scala
scala

// Correct:
if (true) {
  println("Wow!")
}

// Correct:
if (true) statement1 else statement2

// Wrong:
if (true)
  println("Wow!")

...