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Table of Contents

Hazelcast Alibaba Nacos Discovery Plugin

PS: The repository is base on hazelcast-zookeeper, thanks!

This plugin provides a service-based discovery by using nacos-client to communicate with your Nacos server.

You can use this plugin with Discovery SPI enabled Hazelcast 3.6.1 and higher applications.

Configuration

Server XML Config

<hazelcast xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.hazelcast.com/schema/config
                               http://www.hazelcast.com/schema/config/hazelcast-config-4.0.xsd"
           xmlns="http://www.hazelcast.com/schema/config">

  <properties>
    <property name="hazelcast.discovery.enabled">true</property>
  </properties>

  <network>
    <join>
      <multicast enabled="false"/>
      <discovery-strategies>
        <discovery-strategy enabled="true" class="com.hazelcast.nacos.NacosDiscoveryStrategy">
          <properties>
            <property name="server_addr">{nacosServerIp}:{nacosServerPort}</property>
            <property name="application_name">{applicationName}</property>
            <!--defaults to discovery-hazelcast -->
            <property name="namespace">{namespace}</property>
            <!--Name of this Hazelcast cluster. You can have multiple distinct clusters to use the same Nacos installation.-->
            <property name="cluster_name">{clusterName}</property>
          </properties>
        </discovery-strategy>
      </discovery-strategies>
    </join>
  </network>
</hazelcast>

Client XML Config

<hazelcast-client xsi:schemaLocation="http://www.hazelcast.com/schema/client-config hazelcast-client-config-4.0.xsd"
                  xmlns="http://www.hazelcast.com/schema/client-config"
                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

  <properties>
    <property name="hazelcast.discovery.enabled">true</property>
  </properties>

  <network>
    <aws enabled="false"/>
    <discovery-strategies>
      <discovery-strategy enabled="true" class="com.hazelcast.nacos.NacosDiscoveryStrategy">
        <properties>
          <property name="server_addr">{nacosServerIp}:{nacosServerPort}</property>
          <property name="application_name">{applicationName}</property>
          <!--defaults to discovery-hazelcast -->
          <property name="namespace">{namespace}</property>
          <!--Name of this Hazelcast cluster. You can have multiple distinct clusters to use the same Nacos installation.-->
          <property name="cluster_name">{clusterName}</property>
        </properties>
      </discovery-strategy>
    </discovery-strategies>
  </network>

</hazelcast-client>

Server Programmatic Config

Config config = new Config();
config.getNetworkConfig().getJoin().getMulticastConfig().setEnabled(false);
config.setProperty("hazelcast.discovery.enabled", "true");

DiscoveryStrategyConfig discoveryStrategyConfig = new DiscoveryStrategyConfig(new NacosDiscoveryStrategyFactory())
  .addProperty(NacosDiscoveryProperties.SERVER_ADDR.key(), "{nacosServerIp}:{nacosServerPort}")
  .addProperty(NacosDiscoveryProperties.APPLICATION_NAME.key(), "{applicationName}")
  .addProperty(NacosDiscoveryProperties.NAMESPACE.key(), "{namespace}")
  .addProperty(NacosDiscoveryProperties.CLUSTER_NAME.key(), "{clusterName}")
config.getNetworkConfig().getJoin().getDiscoveryConfig().addDiscoveryStrategyConfig(discoveryStrategyConfig);

Hazelcast.newHazelcastInstance(config);

Client Programmatic Config

ClientConfig config = new ClientConfig();

config.setProperty("hazelcast.discovery.enabled", "true");

DiscoveryStrategyConfig discoveryStrategyConfig = new DiscoveryStrategyConfig(new NacosDiscoveryStrategyFactory())
  .addProperty(NacosDiscoveryProperties.SERVER_ADDR.key(), "{nacosServerIp}:{nacosServerPort}")
  .addProperty(NacosDiscoveryProperties.APPLICATION_NAME.key(), "{applicationName}")
  .addProperty(NacosDiscoveryProperties.NAMESPACE.key(), "{namespace}")
  .addProperty(NacosDiscoveryProperties.CLUSTER_NAME.key(), "{clusterName}")
config.getNetworkConfig().getDiscoveryConfig().addDiscoveryStrategyConfig(discoveryStrategyConfig);

HazelcastClient.newHazelcastClient(config);

Configuration via Maven

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
      
    ...  
    <dependencies>
        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <version>${nacos.version}</version>
        </dependency>
        <dependency>
            <groupId>com.hazelcast</groupId>
            <artifactId>hazelcast-nacos</artifactId>
            <version>${hazelcast-nacos.version}</version>
        </dependency>
        <dependency>
            <groupId>com.hazelcast</groupId>
            <artifactId>hazelcast</artifactId>
            <version>${hazelcast.version}</version>
        </dependency>
    </dependencies>
...
</project>

Compatibilities

  • nacos-client-2.2.4 has been tested with Nacos 1.3.2 and Nacos 2.0

Known Issues

There is an issue between Nacos and curator client in some versions. You may get Received packet at server of unknown type 15 error.