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IN ACTION Josiah L. Carlson FOREWORD BY Salvatore Sanfilippo M A N N I N G www.it-ebooks.info Redis in Action www.it-ebooks.info www.it-ebooks.info Redis in Action JOSIAH L. CARLSON MANNING Shelter Island www.it-ebooks.info For online information and ordering of this and other Manning books, please visit www.manning.com. The publisher offers discounts on this book when ordered in quantity. For more information, please contact Special Sales Department Manning Publications Co. 20 Baldwin Road PO Box 261 Shelter Island, NY 11964 Email: [email protected] ©2013 by Manning Publications Co. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by means electronic, mechanical, photocopying, or otherwise, without prior written permission of the publisher. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in the book, and Manning Publications was aware of a trademark claim, the designations have been printed in initial caps or all caps. Recognizing the importance of preserving what has been written, it is Manning’s policy to have the books we publish printed on acid-free paper, and we exert our best efforts to that end. Recognizing also our responsibility to conserve the resources of our planet, Manning books are printed on paper that is at least 15 percent recycled and processed without the use of elemental chlorine. Manning Publications Co. Development editor: Elizabeth Lexleigh 20 Baldwin Road Technical proofreaders: James Philips, Kevin Chang, PO Box 261 and Nicholas Lindgren Shelter Island, NY 11964 Java translator: Eric Van Dewoestine Copyeditor: Benjamin Berg Proofreader: Katie Tennant Typesetter: Gordan Salinovic Cover designer: Marija Tudor ISBN 9781935182054 Printed in the United States of America 1 2 3 4 5 6 7 8 9 10 – MAL – 18 17 16 15 14 13 www.it-ebooks.info To my dear wife, See Luan, and to our baby girl, Mikela www.it-ebooks.info www.it-ebooks.info brief contents P 1 G . ..........................................................1 ART ETTING STARTED 1 ■ Getting to know Redis 3 2 ■ Anatomy of a Redis web application 24 P 2 C .............................................................37 ART ORE CONCEPTS 3 ■ Commands in Redis 39 4 ■ Keeping data safe and ensuring performance 63 5 ■ Using Redis for application support 90 6 ■ Application components in Redis 110 7 ■ Search-based applications 154 8 ■ Building a simple social network 185 P 3 N .................................................................207 ART EXT STEPS 9 ■ Reducing memory use 209 10 ■ Scaling Redis 228 11 ■ Scripting Redis with Lua 249 vii www.it-ebooks.info www.it-ebooks.info contents foreword xv preface xvii acknowledgments xix about this book xxi about the cover illustration xxv P 1 G ..................................................1 ART ETTING STARTED 1 Getting to know Redis 3 1.1 What is Redis? 4 Redis compared to other databases and software 4 ■ Other features 6 ■ Why Redis? 6 1.2 What Redis data structures look like 7 Strings in Redis 9 ■ Lists in Redis 10 ■ Sets in Redis 11 Hashes in Redis 12 ■ Sorted sets in Redis 13 1.3 Hello Redis 15 Voting on articles 15 ■ Posting and fetching articles 19 Grouping articles 20 1.4 Getting help 22 1.5 Summary 22 ix www.it-ebooks.info

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Redis in Action JOSIAH L. CARLSON MANNING Shelter Island www.it-ebooks.info