September 2017
Beginner to intermediate
360 pages
8h 13m
English
book
Practical Real-time Data Processing and Analytics
by Shilpi Saxena, Selva raj Ramasamy, Prateek Bhati, Saurabh Gupta
Content preview from Practical Real-time Data Processing and Analytics
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DataSet API
DataSet API is used for batch processing. It has almost the same type of transformations as DataStream API provides. The following code snippet is a small example of word count using DataSet API:
final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();DataSet<String> text = env.fromElements("Who's there?","I think I hear them. Stand, ho! Who's there?");DataSet<Tuple2<String, Integer>> wordCounts = text.flatMap(new LineSplitter()).groupBy(0).sum(1);
Here the execution environment is different compared to DataStream, that is ExecutionEnviornment. The previous program is doing the same task, but using a different method on bounded data.
The following are the transformations available with DataSet API and they ...
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