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You're reading from  Learning Neo4j 3.x - Second Edition

Product typeBook
Published inOct 2017
Reading LevelIntermediate
PublisherPackt
ISBN-139781786466143
Edition2nd Edition
Languages
Java
Tools
Neo4j
Concepts
Databases
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Author (1)
Jerome Baton
Jerome Baton
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Jerome Baton

Jérôme Baton started hacking computers at the age of skin problems, gaming first then continued his trip by self-learning Basic on Amstrad CPC, peaking on coding a full screen horizontal starfield, and messing the interlace of the video controller so that sprites appeared twice as high in horizontal beat'em up games. Disks were three inches for 178 Kb then. Then, for gaming reasons, he switched to Commodore Amiga and its fantastic AMOS Basic. Later caught by seriousness and studies, he wrote Turbo Pascal, C, COBOL, Visual C++, and Java on PCs and mainframes at university, and even Logo in high school. Then, Java happened and he became a consultant, mostly on backend code of websites in many different businesses. Jérôme authored several articles in French on Neo4j, JBoss Forge, an Arduino workshop for Devoxx4Kids, and reviewed kilos of books on Android. He has a weakness for wordplay, puns, spoonerisms, and Neo4j that relieves him from join(t) pains. Jérôme also has the joy to teach in French universities, currently at I.U.T de Paris, Université Paris V - René Descartes (Neo4j, Android), and Université de Troyes (Neo4j), where he does his best to enterTRain the students. When not programming, Jérôme enjoys photography, doing electronics, everything DIY, understanding how things work, trying to be clever or funny on Twitter, and spends a lot of time trying to understand his kids and life in general.
Read more about Jerome Baton

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Concepts

In a causal cluster, there can be two categories of servers. Core servers are the most important over read replica servers, as replicas are disposable and can be either added or removed during the scaling of the cluster. Let's go through their roles.

Core servers

Core servers are the most important servers of a cluster. The minimum number of core servers in a cluster is three for a transaction is reported as successful to the user who started it when the update generated is propagated to half the size of the cluster plus 1.

The roles of core servers are as follows:

  • They are the targets of all the updating queries; they uphold data consistency via the consensus commit
  • They are responsible for data safety
  • They do the query routing, along with the bolt protocol drivers
  • They copy data to read replicas (when polled)

Although this is transparent for the users, the admins know that, in a cluster, one server is the leader and is elected by the other core servers.

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Learning Neo4j 3.x - Second Edition
Published in: Oct 2017Publisher: PacktISBN-13: 9781786466143
© 2017 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Jerome Baton

Jérôme Baton started hacking computers at the age of skin problems, gaming first then continued his trip by self-learning Basic on Amstrad CPC, peaking on coding a full screen horizontal starfield, and messing the interlace of the video controller so that sprites appeared twice as high in horizontal beat'em up games. Disks were three inches for 178 Kb then. Then, for gaming reasons, he switched to Commodore Amiga and its fantastic AMOS Basic. Later caught by seriousness and studies, he wrote Turbo Pascal, C, COBOL, Visual C++, and Java on PCs and mainframes at university, and even Logo in high school. Then, Java happened and he became a consultant, mostly on backend code of websites in many different businesses. Jérôme authored several articles in French on Neo4j, JBoss Forge, an Arduino workshop for Devoxx4Kids, and reviewed kilos of books on Android. He has a weakness for wordplay, puns, spoonerisms, and Neo4j that relieves him from join(t) pains. Jérôme also has the joy to teach in French universities, currently at I.U.T de Paris, Université Paris V - René Descartes (Neo4j, Android), and Université de Troyes (Neo4j), where he does his best to enterTRain the students. When not programming, Jérôme enjoys photography, doing electronics, everything DIY, understanding how things work, trying to be clever or funny on Twitter, and spends a lot of time trying to understand his kids and life in general.
Read more about Jerome Baton

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