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ResultTask[T, U] is a Task that executes a partition processing function on a partition with records (of type T) to produce a result (of type U) that is sent back to the driver.

T -- [ResultTask] --> U

Creating Instance

ResultTask takes the following to be created:

ResultTask is created when:

Running Task

  context: TaskContext): U

runTask is part of the Task abstraction.

runTask deserializes a RDD and a partition processing function from the broadcast variable (using the Closure Serializer).

In the end, runTask executes the function (on the records from the partition of the RDD).

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