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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Windowed operator configuration
Because we are developing an application for a taxi driver looking for passengers, we are only interested in the last few minutes of data, to have a good advice for the driver where to look. We are accumulating the data in 5-minute sliding windows that slide by 1 minute so that we always use the data from the past 5 minutes for our service. In Application.java:
KeyedWindowedOperatorImpl<String, Double, MutableDouble, Double> windowedOperator = new KeyedWindowedOperatorImpl<>();
// 5-minute windows slide by 1 minute
windowedOperator.setWindowOption(new WindowOption.TimeWindows(Duration.standardMinutes(5)).slideBy(Duration .standardMinutes(1))); // Because we only care about the last 5 minutes, lateness horizon ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.