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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Example – exactly-once counting
The following example is again a variation of the word count that will further illustrate the concepts in this chapter. Incorporating the interaction with external systems, it will be closer to the requirements of real-world streaming applications:
- Read from a source (in this case Kafka)
- A transformation (counting words) that emits incremental aggregates
- A JDBC sink that will maintain totals accumulating the incremental aggregates
The source code for the example can be found at the following link: https://github.com/apache/apex-malhar/tree/master/examples/exactly-once
This scenario will allow us to examine in more detail how the end-to-end exactly-once processing guarantee is supported by Apex and its connectors. ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.