Common Spark Transformations

• 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 “Join”