Design an anti-skew strategy for a join on a high-cardinality key with a long-tail distribution (e.g., a few keys hold 80% of rows). Cover salting, split-skew, AQE, and cost/operational trade-offs.
Spark/Big Datahard
3
Difference between var, val, and def in Scala
General/Otherhard
4
Memory Management in Spark - executor, storage, shuffle memory
Spark/Big Datahard
5
Salting Implementation - provide example
Spark/Big Datahard
6
Spark Configurations for Large-Scale Jobs
Spark/Big Datahard
7
Spark Execution Flow - describe
Spark/Big Datahard
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