Storm Real-time Processing Cookbook Efficiently process unbounded streams of data in real time Quinton Anderson BIRMINGHAM - MUMBAI Storm Real-time Processing Cookbook Copyright © 2013 Packt Publishing All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information. First published: August 2013 Production Reference: 1190813 Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK. ISBN 978-1-78216-442-5 www.packtpub.com Cover Image by Suresh Mogre ([email protected]) FM-2 Credits Author Project Coordinator Quinton Anderson Navu Dhillon Reviewers Proofreaders Maarten Ectors Stephen Copestake Alexey Kachayev Clyde Jenkins Paco Nathan Indexer Acquisition Editor Mariammal Chettiyar Usha Iyer Graphics Lead Technical Editor Abhinash Sahu Madhuja Chaudhari Production Coordinator Technical Editors Prachali Bhiwandkar Hardik B. Soni Cover Work Dennis John Prachali Bhiwandkar Copy Editors Mradula Hegde Alfida Paiva Laxmi Subramanian Aditya Nair Sayanee Mukherjee FM-3 About the Author Quinton Anderson is a software engineer with a background and focus on real-time computational systems. His career has been split between building real-time communication systems for defense systems and building enterprise applications within financial services and banking. Quinton does not align himself with any particular technology or programming language, but rather prefers to focus on sound engineering and polyglot development. He is passionate about open source, and is an active member of the Storm community; he has also enjoyed delivering various Storm-based solutions. Quinton's next area of focus is machine learning; specifically, Deep Belief networks, as they pertain to robotics. Please follow his blog entries on Computational Theory, general IT concepts, and Deep Belief networks for more information. You can find more information on Quinton via his LinkedIn profile (http://au.linkedin. com/pub/quinton-anderson/37/422/11b/) or more importantly, view and contribute to the source code available at his GitHub (https://github.com/quintona) and Bitbucket (https://bitbucket.org/qanderson) accounts. I would like to thank the Storm community for their efforts in building a truly awesome platform for the open source community; a special mention, of course, to the core author of Storm, Nathan Marz. I would like to thank my wife and children for putting up with my long working hours spent on this book and other related projects. Your effort in making up for my absence is greatly appreciated, and I love you all very dearly. I would also like to thank all those who participated in the review process of this book. FM-4 About the Reviewers Maarten Ectors is an executive who is an expert in cloud computing, big data, and disruptive innovations. Maarten's strengths are his combination of deep technical and business skills as well as strategic insights. Currently, Maarten is responsible for the cloud strategy at Canonical—the company behind Ubuntu—where he is changing the future of cloud, big data, and other disruptive innovations. Previously, Maarten had his own company and was defining and executing the cloud strategy of a global mobile company. Maarten worked for Nokia Siemens Networks in several roles. He was heading cloud and disruptive innovation, founded Startups@NSN, was responsible for implementing offshoring in Europe, and so on. Earlier, he worked as the Director of professional services for Telcordia (now Ericsson) and as a Senior Project / Product Manager for a dotcom. Maarten started his career at Accenture, where he was active in Java developments, portals, mobile applications, content management, ecommerce, security, project management, and so on. I would like to thank my family for always being there for me. Especially my wonderful wife, Esther, and my great kids. FM-5 Alexey Kachayev began his development career in a small team creating an open source CMS for social networks. For over 2 years, he had been working as a Software Engineer at CloudMade, developing geo-relative technology for enterprise clients in Python and Scala. Currently, Alexey is the CTO at Attendify and is focused on development of a distributed applications platform in Erlang. He is an active speaker at conferences and an open source contributor (working on projects in Python, Clojure, and Haskell). His area of professional interests include distributed systems and algorithms, types theory, and functional language compilers. I would like to thank Nathan Marz and the Storm project contributors team for developing such a great technology and spreading great ideas. Paco Nathan is the Chief Scientist at Mesosphere in San Francisco. He is a recognized expert in Hadoop, R, Data Science, and Cloud Computing, and has led innovative data teams building large-scale apps for the past decade. Paco is an evangelist for the Mesos and Cascading open source projects. He is also the author of Enterprise Data Workflows with Cascading, O'Reilly. He has a blog about Data Science at http://liber118.com/pxn/. FM-6 www.packtpub.com Support files, eBooks, discount offers and more You might want to visit www.packtpub.com for support files and downloads related to your book. Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.packtpub.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at [email protected] for more details. 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FM-7 Table of Contents Preface 1 Chapter 1: Setting Up Your Development Environment 7 Introduction 7 Setting up your development environment 8 Distributed version control 10 Creating a "Hello World" topology 13 Creating a Storm cluster – provisioning the machines 21 Creating a Storm cluster – provisioning Storm 28 Deriving basic click statistics 33 Unit testing a bolt 43 Implementing an integration test 46 Deploying to the cluster 49 Chapter 2: Log Stream Processing 51 Introduction 51 Creating a log agent 52 Creating the log spout 54 Rule-based analysis of the log stream 60 Indexing and persisting the log data 64 Counting and persisting log statistics 68 Creating an integration test for the log stream cluster 71 Creating a log analytics dashboard 75 Chapter 3: Calculating Term Importance with Trident 89 Introduction 89 Creating a URL stream using a Twitter filter 90 Deriving a clean stream of terms from the documents 95 Calculating the relative importance of each term 101