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.
  1. Unboxing Big Data
  2. difference between repartition and coalesce
  3. difference between cache and persist
  4. difference between order by and sort by
  5. difference between sortby and sortwithinpartitions
  6. reducebykey and groupbykey difference in spark
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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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