Book Image

Big Data Analysis with Python

By : Ivan Marin, Ankit Shukla, Sarang VK
Book Image

Big Data Analysis with Python

By: Ivan Marin, Ankit Shukla, Sarang VK

Overview of this book

Processing big data in real time is challenging due to scalability, information inconsistency, and fault tolerance. Big Data Analysis with Python teaches you how to use tools that can control this data avalanche for you. With this book, you'll learn practical techniques to aggregate data into useful dimensions for posterior analysis, extract statistical measurements, and transform datasets into features for other systems. The book begins with an introduction to data manipulation in Python using pandas. You'll then get familiar with statistical analysis and plotting techniques. With multiple hands-on activities in store, you'll be able to analyze data that is distributed on several computers by using Dask. As you progress, you'll study how to aggregate data for plots when the entire data cannot be accommodated in memory. You'll also explore Hadoop (HDFS and YARN), which will help you tackle larger datasets. The book also covers Spark and explains how it interacts with other tools. By the end of this book, you'll be able to bootstrap your own Python environment, process large files, and manipulate data to generate statistics, metrics, and graphs.
Table of Contents (11 chapters)
Big Data Analysis with Python
Preface

Reading Data in Spark from Different Data Sources


One of the advantages of Spark is the ability to read data from various data sources. However, this is not consistent and keeps changing with each Spark version. This section of the chapter will explain how to read files in CSV and JSON.

Exercise 47: Reading Data from a CSV File Using the PySpark Object

To read CSV data, you have to write the spark.read.csv("the file name with .csv") function. Here, we are reading the bank data that was used in the earlier chapters.

Note

The sep function is used here.

We have to ensure that the right sep function is used based on how the data is separated in the source data.

Now let's perform the following steps to read the data from the bank.csv file:

  1. First, let's import the required packages into the Jupyter notebook:

    import os
    import pandas as pd
    import numpy as np
    import collections
    from sklearn.base import TransformerMixin
    import random
    import pandas_profiling
  2. Next, import all the required libraries, as illustrated...