September 2018
Intermediate to advanced
398 pages
9h 43m
English
Content preview from Scala Programming Projects
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Execution model
The methods available in Dataset and the RDD are of two kinds:
- Transformations: They return a new Dataset API that will apply the transformation later when an action method is called. For instance, map, filter, join, and flatMap.
- Actions: They trigger the execution of a Spark job, for instance, collect, take, and count.
When a job is triggered by an action method, it is divided into several stages. A stage is a part of a job that can be run without having to shuffle the data across different nodes of the cluster. It can encompass several transformations, such as map and filter. But as soon as one transformation, such as join, requires the data be moved (shuffling), another stage must be introduced.
The data contained in ...
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