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How does groupbykey work in spark?

Question Posted / pawan gill


How does groupbykey work in spark?..

Answer / Vaibhav Tripathi

GroupByKey is a transformation that allows you to perform a reduce operation across key-value pairs in distributed collections (RDDs). When used, Spark splits the RDD into several parts, groups them by their keys, and then performs reductions on each group independently. The result is a new RDD with pairs of keys and reduced values.

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