Repartition vs Coalesce in Apache Spark | Rock the JVM
Written version: https://blog.rockthejvm.com/repartiti...
This video is for the Spark programmer who knows the basics and who is ready to dive a little deeper into it. In this video we'll talk about a fundamental Spark distinction between the two ways of redistributing data in between partitions. We'll see how they're similar, how they're different, and we'll do a small performance test, then we'll explain why.
This is one of the many techniques we talk about in the Spark Optimization series at Rock the JVM.
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