Gain insights into enhancing Python data processing with PySpark. Delve into reading, transforming, aggregating data, and creating user-defined functions, boosting efficiency with Apache Spark.

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Pandas is a popular Python library used to manipulate data, but it has certain limitations in its ability to process large datasets. The Apache Spark analytics library offers significant performance improvements.

This course will help improve your Python-based data processing by leveraging Apache Spark’s multithreading capabilities through the PySpark library. You’ll start by reading data into a PySpark DataFrame before performing basic input/output functions, such as renaming attributes, selecting, and writing data. You’ll move onto transformation functions like aggregation, statistical analysis, and joins before creating custom, user-defined functions. At each step, you’ll get a quick Pandas review before being walked through leveraging the more robust PySpark library to unlock Apache Spark.

By the end of this course, you’ll be able to quickly and reliably process large amounts of data, even stored across multiple files, using PySpark.

From Pandas to PySpark DataFrame

PySpark API already provides a built-in function to read the distributed data. We have to give the main directory location. PySpark will consider the whole directory as a data source. The #key# SparkContext: SparkSession vs SparkContext – Since earlier versions of Spark or Pyspark, SparkContext (JavaSparkContext for Java) is an entry point to Spark programming with RDD and to connect to Spark Cluster, Since Spark 2.0 SparkSession has been introduced and became an entry point to start programming with DataFrame and Dataset. #key# exposes a `spark.read.<filetype>` method using which it is possible to read "CSV", "JSON", "parquet", or other types of files. It can be a single file source or data distributed across multiple files.


Learn to read the parquet data source of PySpark.


Read Parquet Data Source

Learn to read the parquet data source of PySpark.

Introduction

Data Input/Output

Data Transformation

User Defined Function (UDF)

Wrapping Up

Appendix

Read Parquet Data Source