March 2017
Beginner to intermediate
356 pages
7h 11m
English
Content preview from Learning Apache Spark 2
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Passing functions to Spark (Java)
In Java, to create a function you will have to implement the interfaces available in the org.apache.spark.api.java function package. There are two popular ways to create such functions:
- Implement the interface in your own class, and pass the instance to Spark.
- Starting Java 8, you can use Lambda expressions to pass off the functions to the Spark framework.
Let's implement the preceding word count examples in Java:
Figure 2.13: Code example of Java implementation of word count (inline functions)
If you belong to a group of programmers who feel that writing inline functions makes the code complex and unreadable (a ...
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