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Flavio Junqueira - ZooKeeper: Distributed process coordination

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Flavio Junqueira ZooKeeper: Distributed process coordination

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Building distributed applications is difficult enough without having to coordinate the actions that make them work. This practical guide shows how Apache ZooKeeper helps you manage distributed systems, so you can focus mainly on application logic. Even with ZooKeeper, implementing coordination tasks is not trivial, but this book provides good practices to give you a head start, and points out caveats that developers and administrators alike need to watch for along the way.

In three separate sections, ZooKeeper contributors Flavio Junqueira and Benjamin Reed introduce the principles of distributed systems, provide ZooKeeper programming techniques, and include the information you need to administer this service.

  • Learn how ZooKeeper solves common coordination tasks
  • Explore the ZooKeeper APIs Java and C implementations and how they differ
  • Use methods to track and react to ZooKeeper state changes
  • Handle failures of the network, application processes, and ZooKeeper itself
  • Learn about ZooKeepers trickier aspects dealing with concurrency, ordering, and configuration
  • Use the Curator high-level interface for connection management
  • Become familiar with ZooKeeper internals and administration tools

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ZooKeeper
Flavio Junqueira
Benjamin Reed
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Preface

Building distributed systems is hard. A lot of the applications people use daily, however, depend on such systems, and it doesnt look like we will stop relying on distributed computer systems any time soon. Apache ZooKeeper has been designed to mitigate the task of building robust distributed systems. It has been built around core distributed computing concepts, with its main goal to present the developer with an interface that is simple to understand and program against, thus simplifying the task of building such systems.

Even with ZooKeeper, the task is not trivialwhich leads us to this book. This book will get you up to speed on building distributed systems with Apache ZooKeeper. We start with basic concepts that will quickly make you feel like youre a distributed systems expert. Perhaps it will be a bit disappointing to see that it is not that simple when we discuss a bunch of caveats that you need to be aware of. But dont worry; if you understand well the key issues we expose, youll be on the right track to building great distributed applications.

Audience

This book is aimed at developers of distributed systems and administratorsof applications using ZooKeeper in production. We assume knowledge of Java,and try to give you enough background in the principles of distributedsystems to use ZooKeeper robustly.

Contents of This Book

covers some motivations for a system like Apache ZooKeeper, and some of the necessary background in distributed systems that you need to use it.

  • , explains what ZooKeeper can accomplish and how its design supports its mission.
  • , goes over the basic concepts and building blocks. It explains how to get a more concrete idea of what ZooKeeper can do by using the command line.

covers the library calls and programmingtechniques that programmers need to know. It is useful but notrequired reading for system administrators. This part focuses on theJava API because it is the most popular. If you are using a differentlanguage, you can read this part to learn the basic techniques andfunctions, then implement them in a different language. We have anadditional chapter covering the C binding for the developers ofapplications in this language.

  • , introduces the Java API.
  • , explains how to track and react to changes to the state of ZooKeeper.
  • , shows how to recover from system or networkproblems.
  • , describes some miscellaneous but importantconsiderations you should look for to avoid problems.
  • , introduces the C API, which is the basis for allthe non-Java implementations of the ZooKeeper API. Therefore, itsvaluable for programmers using any language besides Java.
  • , describes a popular high-levelinterfaces to ZooKeeper.

covers ZooKeeper for systemadministrators. Programmers might also find it useful, in particular the chapter about internals.

  • , describes some of the choices made by ZooKeeperdevelopers that have an impact on administration tasks.
  • , shows how to configure ZooKeeper.
Conventions Used in this Book

The following typographical conventions are used in this book:

Italic Used for emphasis, new terms, URLs, commands and utilities, and file and directory names. Constant width Indicates variables, functions, types, parameters, objects, and other programming constructs. Constant width bold Shows commands or other text that should be typed literally by the user. Also used for emphasis in command output. Constant width italic Indicates placeholders in code or commands that should be replaced by appropriate values.
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Using Code Examples

Supplemental material (code examples, exercises, etc.) is available for download at http://bit.ly/zookeeper-code.

This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: ZooKeeper by Flavio Junqueira and Benjamin Reed (OReilly). Copyright 2014 Flavio Junqueira and Benjamin Reed, 978-1-449-36130-3.

If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at .

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