Understanding Spark architecture
A parallel execution involves splitting the workload into subtasks that are executed in different threads or on different nodes. Let's see how Spark does this and how it manages execution and communication between the subtasks.
Task scheduling
Spark workload splitting is determined by the number of partitions for Resilient Distributed Dataset (RDD), the basic abstraction in Spark, and the pipeline structure. An RDD represents an immutable, partitioned collection of elements that can be operated on in parallel. While the specifics might depend on the mode in which Spark runs, the following diagram captures the Spark task/resource scheduling:
Figure 03-2. A generic Spark task scheduling diagram. While not shown explicitly ...
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