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  • Book Overview & Buying Apache ZooKeeper Essentials
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Apache ZooKeeper Essentials

Apache ZooKeeper Essentials

By : Haloi
4.3 (4)
Buy this Book
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Apache ZooKeeper Essentials

Apache ZooKeeper Essentials

4.3 (4)
By: Haloi
Buy this Book

Overview of this book

Whether you are a novice to ZooKeeper or already have some experience, you will be able to master the concepts of ZooKeeper and its usage with ease. This book assumes you to have some prior knowledge of distributed systems and high-level programming knowledge of C, Java, or Python, but no experience with Apache ZooKeeper is required.
Table of Contents (9 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. A Crash Course in Apache ZooKeeper
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1. A Crash Course in Apache ZooKeeper
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Defining a distributed system
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Why coordination in a distributed system is so challenging
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Introducing Apache ZooKeeper
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Getting hands-on with Apache ZooKeeper
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Summary
2
2. Understanding the Inner Workings of Apache ZooKeeper
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2. Understanding the Inner Workings of Apache ZooKeeper
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A top-down view of the ZooKeeper service
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The ZooKeeper data model
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The ZooKeeper operations
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Watches and ZooKeeper operations
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The ZooKeeper access control lists
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The ZooKeeper stat structure
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Understanding the inner working of ZooKeeper
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Summary
3
3. Programming with Apache ZooKeeper
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3. Programming with Apache ZooKeeper
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Using the Java client library
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The C client library
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Python client bindings
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Summary
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4. Performing Common Distributed System Tasks
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4. Performing Common Distributed System Tasks
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ZooKeeper recipes
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Summary
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5. Administering Apache ZooKeeper
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5. Administering Apache ZooKeeper
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Configuring a ZooKeeper server
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Configuring a ZooKeeper ensemble
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Quota and authorization
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ZooKeeper best practices
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Monitoring a ZooKeeper instance
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Summary
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6. Decorating ZooKeeper with Apache Curator
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6. Decorating ZooKeeper with Apache Curator
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Curator components
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Exhibitor
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Summary
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7. ZooKeeper in Action
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7. ZooKeeper in Action
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Projects powered by ZooKeeper
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Organizations powered by ZooKeeper
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Summary
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Index
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Index

Watches and ZooKeeper operations

The write operations in ZooKeeper are atomic and durable. There is the guarantee of a successful write operation if it has been written to persistent storage on a majority of ZooKeeper's servers. However, the eventual consistency model of ZooKeeper permits reads to log the latest state of the ZooKeeper service, and the sync operation allows a client to be up-to-date with the most recent state of the ZooKeeper service.

The read operations in znodes, such as exists, getChildren, and getData, allow watches to be set on them. On the other hand, the watches triggered by znode's write operations, such as create, delete, and setData ACL operations do not participate in watches.

The following are the types of watch events that might occur during a znode state change:

  • NodeChildrenChanged: A znode's child is created or deleted
  • NodeCreated: A znode is created in a ZooKeeper path
  • NodeDataChanged: The data associated with a znode is updated
  • NodeDeleted: A znode...
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Tech Concepts
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Programming languages
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Apache ZooKeeper Essentials
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