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Big Data Concepts in Hadoop and Spark Data Engineer @ Yahoo Difficulty medium

Explain how Hadoop and Apache Spark handle big data processing. What are the main differences between the two frameworks? Provide examples of use cases where each would be more suitable.
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Difference Between Reduce and GroupBy Functions in Spark Data Engineer @ Yahoo Difficulty medium

In the context of Apache Spark, explain the difference between the reduce function and the groupBy function. Provide examples of when you would use each.
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Processing Large Data Sets Using Apache Spark Data Engineer @ Google Difficulty hard

You have a large dataset stored in a distributed file system like HDFS, and you need to perform complex transformations and aggregations. Explain how you would use Apache Spark to process this dataset. Provide an example of a Spark job that calculates the average value of a specific column.
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