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.
Here in spark reduce example, we’ll understand how reduce operation works in Spark with examples in languages like Scala, Java and Python. Spark reduce operation is an action kind of operation and it triggers a full DAG execution for all lined up lazy instructions.
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.