Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Apache Spark 2.x Cookbook
  • Table Of Contents Toc
Apache Spark 2.x Cookbook

Apache Spark 2.x Cookbook

By : Yadav
3.3 (3)
close
close
Apache Spark 2.x Cookbook

Apache Spark 2.x Cookbook

3.3 (3)
By: Yadav

Overview of this book

While Apache Spark 1.x gained a lot of traction and adoption in the early years, Spark 2.x delivers notable improvements in the areas of API, schema awareness, Performance, Structured Streaming, and simplifying building blocks to build better, faster, smarter, and more accessible big data applications. This book uncovers all these features in the form of structured recipes to analyze and mature large and complex sets of data. Starting with installing and configuring Apache Spark with various cluster managers, you will learn to set up development environments. Further on, you will be introduced to working with RDDs, DataFrames and Datasets to operate on schema aware data, and real-time streaming with various sources such as Twitter Stream and Apache Kafka. You will also work through recipes on machine learning, including supervised learning, unsupervised learning & recommendation engines in Spark. Last but not least, the final few chapters delve deeper into the concepts of graph processing using GraphX, securing your implementations, cluster optimization, and troubleshooting.
Table of Contents (13 chapters)
close
close

Optimizing the level of parallelism


Optimizing the level of parallelism is very important to fully utilize the cluster capacity. In the case of HDFS, it means that the number of partitions is the same as the number of input splits, which is mostly the same as the number of blocks. The default block size in HDFS is 128 MB, and that works well in case of Spark as well. 

In this recipe, we will cover different ways to optimize the number of partitions.

How to do it...

Specify the number of partitions when loading a file into RDD with the following steps:

  1. Start the Spark shell:
$ spark-shell
  1. Load the RDD with a custom number of partitions as a second parameter:
scala> sc.textFile("hdfs://localhost:9000/user/hduser/words",10)

Another approach is to change the default parallelism by performing the following steps:

  1. Start the Spark shell with the new value of default parallelism:
$ spark-shell --conf spark.default.parallelism=10

Note

Have the number of partitions two to three times the number of cores to...

CONTINUE READING
83
Tech Concepts
36
Programming languages
73
Tech Tools
Icon Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.
Icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Icon 50+ new titles added per month and exclusive early access to books as they are being written.
Apache Spark 2.x Cookbook
notes
bookmark Notes and Bookmarks search Search in title playlist Add to playlist font-size Font size

Change the font size

margin-width Margin width

Change margin width

day-mode Day/Sepia/Night Modes

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Confirmation

Modal Close icon
claim successful

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY

Submit Your Feedback

Modal Close icon
Modal Close icon
Modal Close icon