(Why) do we need to call cache or persist on a RDD
When a resilient distributed dataset (RDD) is created from a text file or collection (or from another RDD), do we need to call … Read more
scala
How to define “type disjunction” (union types)?
One way that has been suggested to deal with double definitions of overloaded methods is to replace overloading with pattern matching: object Bar … Read more
Add JAR files to a Spark job – spark-submit
True… it has been discussed quite a lot. However, there is a lot of ambiguity and some of the answers provided … including … Read more
What Scala web-frameworks are available? [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Questions asking us to recommend or find a … Read more
Reduce, fold or scan (Left/Right)?
When should I use reduceLeft, reduceRight, foldLeft, foldRight, scanLeft or scanRight? I want an intuition/overview of their differences – possibly with some simple … Read more
How do I cast a variable in Scala?
Given a variable with type Graphics, how do I cast it to Graphics2D in Scala? 2 Answers 2
Spark performance for Scala vs Python
I prefer Python over Scala. But, as Spark is natively written in Scala, I was expecting my code to run faster in the … Read more
What is the difference between JavaConverters and JavaConversions in Scala?
In scala.collection, there are two very similar objects JavaConversions and JavaConverters. What is the difference between these two objects? Why do they both … Read more
When should I choose Vector in Scala?
It seems that Vector was late to the Scala collections party, and all the influential blog posts had already left. In Java ArrayList … Read more