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Apache ZooKeeper Essentials

By : Saurav Haloi
Book Image

Apache ZooKeeper Essentials

By: Saurav Haloi

Overview of this book

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Table of Contents (14 chapters)
Apache ZooKeeper Essentials
Apache ZooKeeper Essentials
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
A Crash Course in Apache ZooKeeper
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
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
Programming with Apache ZooKeeper
Using the Java client library
The C client library
Python client bindings
Summary
4
Performing Common Distributed System Tasks
Performing Common Distributed System Tasks
ZooKeeper recipes
Summary
5
Administering Apache ZooKeeper
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
Decorating ZooKeeper with Apache Curator
Curator components
Exhibitor
Summary
7
ZooKeeper in Action
ZooKeeper in Action
Projects powered by ZooKeeper
Organizations powered by ZooKeeper
Summary
Index
Index

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:

  1. Create a znode called root with ThisIsTheRootNode as its data:

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

  2. Get the content of the just created znode root:

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

  3. Create a child znode child...

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