Book Image

Mastering Apache Storm

By : Ankit Jain
Book Image

Mastering Apache Storm

By: Ankit Jain

Overview of this book

Apache Storm is a real-time Big Data processing framework that processes large amounts of data reliably, guaranteeing that every message will be processed. Storm allows you to scale your data as it grows, making it an excellent platform to solve your big data problems. This extensive guide will help you understand right from the basics to the advanced topics of Storm. The book begins with a detailed introduction to real-time processing and where Storm fits in to solve these problems. You’ll get an understanding of deploying Storm on clusters by writing a basic Storm Hello World example. Next we’ll introduce you to Trident and you’ll get a clear understanding of how you can develop and deploy a trident topology. We cover topics such as monitoring, Storm Parallelism, scheduler and log processing, in a very easy to understand manner. You will also learn how to integrate Storm with other well-known Big Data technologies such as HBase, Redis, Kafka, and Hadoop to realize the full potential of Storm. With real-world examples and clear explanations, this book will ensure you will have a thorough mastery of Apache Storm. You will be able to use this knowledge to develop efficient, distributed real-time applications to cater to your business needs.
Table of Contents (19 chapters)
Title Page
About the Author
About the Reviewers
Customer Feedback

Non-transactional topology

In non-transactional topology, a spout emits a batch of tuples and doesn't guarantee what's in each batch. With a processing mechanism, we can divide the pipeline into two categories:

  • At-most-once-processing: In this type of topology, failed tuples are not retried. Hence, the spout does not wait for an acknowledgment.
  • At-least-once-processing: Failed tuples are retried in the processing pipeline. Hence, this type of topology guarantees that every tuple that enters the processing pipeline must be processed at least once.

We can write a non-transactional spout by implementing the org.apache.storm.trident.spout.IBatchSpout interface.

This example shows how we can write a Trident spout:

public class FakeTweetSpout implements IBatchSpout{ 
   private static final long serialVersionUID = 10L; 
   private intbatchSize; 
   private HashMap<Long, List<List<Object>>>batchesMap = new HashMap<Long, List<List<Object>>>(); 
   public FakeTweetSpout...