Spark groupBy example can also be compared with groupBy of SQL. In spark, groupBy is a transformation operation. Let’s have some overview first then we’ll understand this operation by some examples in Scala, Java and Python languages.
Looking at spark reduceByKey example, we can say that reduceByKey is one step ahead then reduce function in Spark with the contradiction that it is a transformation operation. Let’s understand this operation by some examples in Scala, Java and Python languages.
In spark filter example, we’ll explore filter method of Spark RDD class in all of three languages Scala, Java and Python. Spark filter operation is a transformation kind of operation so its evaluation is lazy. Let’s dig a bit deeper.
Spark flatMap example is mostly similar operation with RDD map operation. It is also defined in RDD abstract class of spark core library and same as map it also is a transformation kind of operation hence it is lazily evaluated.
In Apache Spark map example, we’ll learn about all ins and outs of map function. Basically map is defined in abstract class RDD in spark and it is a transformation kind of operation which means it is a lazy operation. Let’s explore it in detail.