March 2019
Beginner to intermediate
778 pages
34h 20m
English
Content preview from Building Google Cloud Platform Solutions
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Transformations
Transformations are the basic building block of Cloud Dataflow pipelines, with each transformation representing a step of the overall processing task. Developers define each transformation by implementing PTransform, which accepts one or more PCollection, operates on the elements within that collection, and returns zero or more PCollection as a result of those operations.
By largely abstracting away the underlying bounded/unbounded nature of the data, PCollection allow developers to focus on the PTransform algorithm while allowing Cloud Dataflow to intelligently handle sharding, parallelization, and dynamic rebalancing. Each PTransform can be categorized into one of three types: element-wise transforms, aggregate transforms, ...
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