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

Resource-aware scheduler

A resource-aware scheduler helps users specify the amount of resources required for a single instance of any component (spout or bolt). We can enable the resource-aware scheduler by specifying the following property in the storm.yaml file:

storm.scheduler: "org.apache.storm.scheduler.resource.ResourceAwareScheduler" 

Component-level configuration

You can allocate the memory requirement to any component. Here are the methods available to allocate the memory to a single instance of any component:

public T setMemoryLoad(Number onHeap, Number offHeap) 

Alternatively, you can use the following:

public T setMemoryLoad(Number onHeap) 

The following is the definition of each argument:

  • onHeap: The amount of on heap space an instance of this component will consume in megabytes
  • offHeap: The amount of off heap space an instance of this component will consume in megabytes

The data type of both onHeap and offHeap is Number, and the default value is 0.0.

Memory usage example

Let's consider...