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Apache Kafka 1.0 Cookbook

You're reading from Apache Kafka 1.0 Cookbook Over 100 practical recipes on using distributed enterprise messaging to handle real-time data

Product type Paperback

Published in Dec 2017

Publisher Packt

ISBN-13 9781787286849

Length 250 pages

Edition 1st Edition

Languages

Java

Tools

Kafka

Concepts

Data Analysis

Authors (2):

Raúl Estrada

Alexey Zinoviev

View More author details

Table of Contents (11) Chapters

Preface

1. Configuring Kafka FREE CHAPTER

2. Kafka Clusters

3. Message Validation

4. Message Enrichment

5. The Confluent Platform

6. Kafka Streams

7. Managing Kafka

8. Operating Kafka

9. Monitoring and Security

10. Third-Party Tool Integration

Balancing leadership

A leader broker of a topic partition can be crashed or stopped, and then the leadership is transferred to another replica. This might produce an imbalance in the lead Kafka brokers (an imbalance is when the leader is dead or unreachable). To recover from this imbalance, we need balancing leadership.

Getting ready

For this recipe, a Kafka cluster setup with several nodes is needed. One of the Kafka nodes is down, and subsequently, it is restored.

How to do it...

Run the following command from the Kafka installation directory:

$ bin/kafka-preferred-replica-election.sh --zookeeperlocalhost:2181/chroot

How it works...

If the list of replicas for a partition is [3, 5, 8], then node 3 is preferred as the leader, rather than nodes 5 or 8. This is because it is earlier in the replica list. By running this command, we tell the Kafka cluster to try to restore leadership to the restored replicas.

To explain how it works, suppose that after the leader stops, new Kafka nodes join the cluster...

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Authors (2)

Zinoviev

Zinoviev

See other products by Zinoviev

Estrada

Estrada

Raúl Estrada has been a programmer since 1996 and a Java developer since 2001. He loves all topics related to computer science. With more than 15 years of experience in high-availability and enterprise software, he has been designing and implementing architectures since 2003. His specialization is in systems integration, and he mainly participates in projects related to the financial sector. He has been an enterprise architect for BEA Systems and Oracle Inc., but he also enjoys web, mobile, and game programming. Raúl is a supporter of free software and enjoys experimenting with new technologies, frameworks, languages, and methods. Raúl is the author of other Packt Publishing titles, such as Fast Data Processing Systems with SMACK and Apache Kafka Cookbook.

See other products by Estrada

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