What is a broadcast variable in Apache Spark, and how is it used?
- A variable cached in memory for faster access
- A variable replicated to every executor node
- A variable shared across all nodes in a cluster
- A variable used for inter-process communication
A broadcast variable in Apache Spark is replicated to every executor node for efficient data distribution. It's used for broadcasting large read-only datasets to all tasks across the cluster to avoid excessive data shuffling.
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