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Real questions from top companies in Spark/Big Data · hard
GroupByKey vs ReduceByKey – Differences and performance implications?
Handling Skewness in Data - salting, broadcast join
Handling custom data types in Spark
Have you worked with UDFs in Spark? When do you use them, and how do they differ from built-in functions?
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How can Spark help in optimizing ingestion?
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