Difference between groupByKey() and reduceByKey() in Spark RDD API

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In Apache Spark, both groupByKey and reduceByKey are transformations that can be used to process and manipulate key-value pair RDDs. However, they differ in their functionality and performance characteristics. In this video, detailed explanation of the differences between groupByKey and reduceByKey is shown.
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Datasets api, How to use groupbykey mapgroups map together are very important which has been used in real time projects of scala spark. But, I am not able to find these concepts depth explanation using real time problems.

shashanksinghsisodiya
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groupByKey concept you explained is wrong, it does not aggregates the values, it simply group them same we saw in compactBuffer

SanjayKumar-rwgj
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