Overview

This tutorial demonstrates Apache ZooKeeper for load balancing using Apache Curator.

This tutorial demonstrates following features

• TaskWorker Registry via Worker
• TaskWorker Discovery via Manager
• Dynamic Load Publishing via Worker
• ProviderStrategy -> BalancedLoadStrategy (Custom Strategy) for Manager
• Simple REST Worker & Manager

Starting Worker

mvn exec:java@worker_1
mvn exec:java@worker_2
mvn exec:java@worker_3

Starting Manager

mvn exec:java@manager

Starting ZooKeeper

The above assumes that ZooKeeper is running on localhost at port 2181.

• You can also run ZooKeeper using the runConfigurations provided

• Or Maven ZooKeeper plugin Start / Stop

  mvn net.revelc.code:zookeeper-maven-plugin:start
  mvn net.revelc.code:zookeeper-maven-plugin:stop
  

Testing Load Balancer

for i in 1 2 3 4 5 6 7 8 9 10
do
   curl 'http://localhost:18000/delegate'
   echo ""
done

Inspired From

http://tomaszdziurko.com/2014/07/zookeeper-curator-and-microservices-load-balancing/