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Apache ZooKeeper Essentials

By : Haloi

4.3 (4)

Apache ZooKeeper Essentials

4.3 (4)

By: Haloi

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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. A Crash Course in Apache ZooKeeper

1. A Crash Course in Apache ZooKeeper

Defining a distributed system

Why coordination in a distributed system is so challenging

Introducing Apache ZooKeeper

Getting hands-on with Apache ZooKeeper

Summary

2. Understanding the Inner Workings of Apache ZooKeeper

2. Understanding the Inner Workings of Apache ZooKeeper

A top-down view of the ZooKeeper service

The ZooKeeper data model

The ZooKeeper operations

Watches and ZooKeeper operations

The ZooKeeper access control lists

The ZooKeeper stat structure

Understanding the inner working of ZooKeeper

Summary

3. Programming with Apache ZooKeeper

3. Programming with Apache ZooKeeper

Using the Java client library

The C client library

Python client bindings

Summary

4. Performing Common Distributed System Tasks

4. Performing Common Distributed System Tasks

ZooKeeper recipes

Summary

5. Administering Apache ZooKeeper

5. Administering Apache ZooKeeper

Configuring a ZooKeeper server

Configuring a ZooKeeper ensemble

Quota and authorization

ZooKeeper best practices

Monitoring a ZooKeeper instance

Summary

6. Decorating ZooKeeper with Apache Curator

6. Decorating ZooKeeper with Apache Curator

Curator components

Exhibitor

Summary

7. ZooKeeper in Action

7. ZooKeeper in Action

Projects powered by ZooKeeper

Organizations powered by ZooKeeper

Summary

Index

Index

Customer Reviews

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The ZooKeeper operations

ZooKeeper's data model and its API support the following nine basic operations:

Operation	Description
`create`	Creates a znode in a specified path of the ZooKeeper namespace
`delete`	Deletes a znode from a specified path of the ZooKeeper namespace
`exists`	Checks if a znode exists in the path
`getChildren`	Gets a list of children of a znode
`getData`	Gets the data associated with a znode
`setData`	Sets/writes data into the data field of a znode
`getACL`	Gets the ACL of a znode
`setACL`	Sets the ACL in a znode
`sync`	Synchronizes a client's view of a znode with ZooKeeper

Let's look at the ZooKeeper operations mentioned in the preceding table using ZooKeeper Java shell:

Create a znode called root with ThisIsTheRootNode as its data:

[zk: localhost(CONNECTED) 0] create /root "ThisIsTheRootNode"
Created /root

Get the content of the just created znode root:

[zk: localhost(CONNECTED) 1] get /root
"ThisIsTheRootNode"
...

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