Apache ZooKeeper Essentials: A fast-paced guide to using Apache ZooKeeper to coordinate services in distributed systems

Haloi

€24.99

4.3 (4 Ratings)

Paperback Jan 2015 168 pages 1st Edition

Haloi

€24.99

4.3 (4 Ratings)

Paperback Jan 2015 168 pages 1st Edition

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Apache ZooKeeper Essentials

Chapter 2. Understanding the Inner Workings of Apache ZooKeeper

In the previous chapter, we learned about the general definition of a distributed system and why implementing coordination among components of such a system is hard. We learned how Apache ZooKeeper solves this problem, followed by how to install and configure it. In this chapter, we will read more about the internals and architecture of ZooKeeper. As such, we will cover the following topics here in this second chapter:

The architecture of the ZooKeeper service
The data model behind ZooKeeper
The operations supported by the ZooKeeper data model
Probing the inner workings of ZooKeeper

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"
...

Description

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.

Who is this book for?

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.

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YARN Essentials

Feb 2015 176 pages

4.2 (5)

eBook

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Apache ZooKeeper Essentials

Jan 2015 168 pages

4.3 (4)

eBook

€13.98 ~~€19.99~~

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€24.99

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Oliver Draese Jan 08, 2019

Good book to start ZK based development. Everything you need to know about ZK and surrounding APIs.

Amazon Verified review

The GuN Man Feb 03, 2016

This is a very nice book for a starter who is exploring Zookeeper. It gets you up and running in few hours of skimming through the pages with so much simplicity. Being new to ZK, I started reading O'Reilly book and it seemed pretty dry and soon lost interest. But, when I started with this book, ZK seemed soo much simpler and got a more practical overview of ZK after reading first few pages. So, I continued reading till the end.Now that I've read this book, the O'Reilly book started making much more sense and I use it as a quick reference.I sort of agree with the @Anon's review in that, the O'reilly book is more authoritative and can be used as a reference. However, if you are new to the subject, read "Apache ZooKeeper Essentials" first.

Dick Dowdell Oct 03, 2017

It's a decent book, but pretty thin on programming techniques and examples. Not a lot more than the ZooKeeper Programming section on the Hadoop Web site.

Anon Feb 27, 2015

Overall I think this is a worthy book. It is well written without a lot of filler. However the O'Reilly book is much better and more authoritative. Reading this one I was struck with déjà vu repeatedly since it reads like a summary of existing materials.

Apache ZooKeeper Essentials: A fast-paced guide to using Apache ZooKeeper to coordinate services in distributed systems

What do you get with Print?

Apache ZooKeeper Essentials

Chapter 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

A top-down view of the ZooKeeper service

The ZooKeeper data model

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Apache ZooKeeper Essentials: A fast-paced guide to using Apache ZooKeeper to coordinate services in distributed systems

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