April 2017
Intermediate to advanced
532 pages
12h 39m
English
The Java API is very similar in principle to the Scala API. However, while Scala can call the Java code quite easily, in some cases, it is not possible to call the Scala code from Java. This is particularly the case when Scala code makes use of Scala features such as implicit conversions, default parameters, and the Scala reflection API.
Spark makes heavy use of these features in general, so it is necessary to have a separate API specifically for Java that includes Java versions of the common classes. Hence, SparkContext becomes JavaSparkContext and RDD becomes JavaRDD.
Java versions prior to version 8 do not support anonymous functions and do not have succinct syntax for functional-style programming, ...
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