November 2017
Beginner to intermediate
290 pages
7h 34m
English
book
Learning Apache Apex
by Ananth Gundabattula, Thomas Weise, Munagala V. Ramanath, David Yan, Kenneth Knowles
Content preview from Learning Apache Apex
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Advanced topic – stateful ParDo
Both ParDo and per key aggregation are standard patterns for parallelism that go back decades. When implementing these in a massive-scale distributed data processing engine, we can highlight a few characteristics that are particularly important.
Characteristics of ParDo:
- You write single-threaded code to process one element
- Elements are processed in an arbitrary order with no dependencies or interaction between processing of elements
Characteristics for per key aggregation:
- Elements for a common key and window are gathered together
- A user-defined operator is applied to these elements
Stateful ParDo is a computational pattern that combines aspects of each of these:
- Elements for a common key and window are ...
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