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What does reduce action do?



What does reduce action do?..

Answer / Ravindra Kumar Suman

The reduce action in Apache Spark is used to combine all the elements of a Dataset, DataFrame, or RDD into a single value by repeatedly applying an associative reduction operation (like sum(), min(), max()) until no more intermediate results are needed. This operation can be chained with other transformations like map() and filter() to perform complex operations on large datasets.

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