---
title: "Common Spark Transformations"
type: concept
source: https://www.jemoka.com/posts/kbhcommon_spark_transformations/
confidence: high
status: active
---

map(func): apply a function on all functions filter(func): filter based on function flatMap(func): flatten returned lists into one giant list union(rdd): create a union of multiple RDD0 subtract(rdd): subtract RDDs cartesian(rdd): cartesian product of rdd parallelize(list): make an RDD from list Special transformations for Pair RDDs reduceByKey(func): key things groupByKey(func): key things sortByKey(func): key things See also Database &ldquo;Join&rdquo;
