trait PartitionEvaluatorFactory[T, U] extends Serializable
A factory to create PartitionEvaluator. Spark serializes and sends PartitionEvaluatorFactory to executors, and then creates PartitionEvaluator via the factory at the executor side.
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abstract
def
createEvaluator(): PartitionEvaluator[T, U]
Creates a partition evaluator.
Creates a partition evaluator. Each RDD partition will create one evaluator instance, which means one evaluator instance will be used by only one thread.
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