September 2015
Intermediate to advanced
148 pages
3h 20m
English
Content preview from Apache Spark Graph ProcessingBecome 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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Data operations on VertexRDD and EdgeRDD
All of the operations we've seen previously are graph operations. They are invoked on a graph and they return a new graph object. In this section, we will introduce operations that transform VertexRDD and EdgeRDD collections. The types of these collections are subtypes of RDD[(VertexID, VD)] and RDD[Edge[ED]] respectively.
Mapping VertexRDD and EdgeRDD
First, mapValues takes a map function as input, which transforms each vertex attribute in the VertexRDD. Then, it returns a new VertexRDD object while preserving the original vertex indices. The method mapValues is overloaded so that the map function can take an input with a type VD or (VertexId, VD). The type of the new vertex attributes can be different to ...
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