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Learning PySpark

Learning PySpark

By : Drabas, Lee
3.9 (194)
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Learning PySpark

Learning PySpark

3.9 (194)
By: Drabas, Lee

Overview of this book

Apache Spark is an open source framework for efficient cluster computing with a strong interface for data parallelism and fault tolerance. This book will show you how to leverage the power of Python and put it to use in the Spark ecosystem. You will start by getting a firm understanding of the Spark 2.0 architecture and how to set up a Python environment for Spark. You will get familiar with the modules available in PySpark. You will learn how to abstract data with RDDs and DataFrames and understand the streaming capabilities of PySpark. Also, you will get a thorough overview of machine learning capabilities of PySpark using ML and MLlib, graph processing using GraphFrames, and polyglot persistence using Blaze. Finally, you will learn how to deploy your applications to the cloud using the spark-submit command. By the end of this book, you will have established a firm understanding of the Spark Python API and how it can be used to build data-intensive applications.
Table of Contents (13 chapters)
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12
Index

Understanding vertex degrees


Within the context of graph theory, the degrees around a vertex are the number of edges around the vertex. In our flights example, the degrees are then the total number of edges (that is, flights) to the vertex (that is, airports). Therefore, if we were to obtain the top 20 vertex degrees (in descending order) from our graph, then we would be asking for the top 20 busiest airports (most flights in and out) from our graph. This can be quickly determined using the following query:

display(tripGraph.degrees.sort(desc("degree")).limit(20))

Because we're using the display command, we can quickly view a bar graph of this data:

Diving into more details, here are the top 20 inDegrees (that is, incoming flights):

display(tripGraph.inDegrees.sort(desc("inDegree")).limit(20))

While here are the top 20 outDegrees (that is, outgoing flights):

display(tripGraph.outDegrees.sort(desc("outDegree")).limit(20))

Interestingly, while the top 10 airports (Atlanta/ATL to Charlotte/CLT) are...

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