Hazelcast Client configuration using Eureka not working...

ama...@gmail.com

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Apr 24, 2019, 3:38:53 AM4/24/19

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Hello,

I am using Eureka for service discovery in my microservices. I have setup the Hazelcast members via Eureka discovery and it is working all good.

Now, I am trying to setup a Hazelcast client and it should discover the member cluster using Eureka. I have done below configuration for client:

public ClientConfig buildConfiguration()

{

ClientConfig config = new ClientConfig();

ClientNetworkConfig netConfig = config.getNetworkConfig();

netConfig.setConnectionAttemptLimit(0); // try forever for connecting with server cluster.

// configure Eureka

netConfig.getEurekaConfig().setEnabled(true).setProperty("namespace", "hz_cache")

.setProperty("use-classpath-eureka-client-props", "false").setProperty("shouldUseDns", "false")

.setProperty("name", "hazelcast_cache").setProperty("serviceUrl.default", eurekaURL);

return config;

}

But, the discovery does not happen through Eureka, it always happens through multicast. Plus, the client tries to register itself as a separate member in the Eureka.

Please help me to solve the issue.

Thanks.

Rafal Leszko

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Apr 24, 2019, 5:46:20 AM4/24/19

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Hi,

Please check the code sample dedicated to the Eureka discovery: https://github.com/hazelcast/hazelcast-code-samples/tree/master/hazelcast-integration/eureka/springboot-embedded.

You can follow this up the "Hazelcast Only" scenario. This will set up the Hazelcast cluster.

Then, I checked the client by modifying hazlecast-only project and changed the Maven dependency `hazelcast` => `hazelcast-all`. Then, the Hazelcast configuration to the following.

@Bean
public ClientConfig hazelcastConfig() {


  ClientConfig config = new ClientConfig();

  config.getNetworkConfig().getEurekaConfig()
      .setEnabled(true)
      .setProperty("self-registration", "false")
      .setProperty("namespace", "hazelcast");

  return config;
}

Client discovered the Hazelcast cluster correctly.

Hope it helps,

Rafał

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Rafał Leszko

Software Engineer

ra...@hazelcast.com

@RafalLeszko

ama...@gmail.com

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Apr 24, 2019, 9:20:18 AM4/24/19

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Could you post the content of the console? I doubt if the client connected to the cluster through Eureka discovery. On my machine the client gets connected with cluster. But when I deploy the cluster on a separate machine (or on docker), the client is not able to connect. Looking at the console, the client is not using Eureka to find out cluster at all.

Please suggest if I am missing anything here. I have exactly the same code as you posted above.

Thanks.

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Rafal Leszko

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Apr 24, 2019, 9:32:45 AM4/24/19

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Sure, here's my output. It looks like it connects via Eureka.

Maybe your issue is somewhere in the Docker's networking? Check this: https://github.com/hazelcast/hazelcast-docker#hazelcast-hello-world

Cheers,

Rafał

2019-04-24 09:41:35.345 INFO 2247 --- [ main] .p.EurekaConfigBasedInstanceInfoProvider : Setting initial instance status as: STARTING

2019-04-24 09:41:35.370 WARN 2247 --- [ main] c.n.config.util.ConfigurationUtils : jar:file:/mnt/c/Users/rafal/Hazelcast/repos/hazelcast-code-samples/hazelcast-integration/eureka/springboot-embedded/hazelcast-client/target/hazelcast-client-0.1-SNAPSHOT.jar!/BOOT-INF/classes!/eureka-client.properties is already loaded

2019-04-24 09:41:35.522 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Initializing Eureka in region us-east-1

2019-04-24 09:41:36.381 INFO 2247 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using JSON encoding codec LegacyJacksonJson

2019-04-24 09:41:36.385 INFO 2247 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using JSON decoding codec LegacyJacksonJson

2019-04-24 09:41:36.953 INFO 2247 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using XML encoding codec XStreamXml

2019-04-24 09:41:36.956 INFO 2247 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using XML decoding codec XStreamXml

2019-04-24 09:41:37.752 INFO 2247 --- [ main] c.n.d.s.r.aws.ConfigClusterResolver : Resolving eureka endpoints via configuration

2019-04-24 09:41:37.875 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Disable delta property : false

2019-04-24 09:41:37.878 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Single vip registry refresh property : null

2019-04-24 09:41:37.883 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Force full registry fetch : false

2019-04-24 09:41:37.885 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Application is null : false

2019-04-24 09:41:37.894 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Registered Applications size is zero : true

2019-04-24 09:41:37.910 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Application version is -1: true

2019-04-24 09:41:37.929 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Getting all instance registry info from the eureka server

2019-04-24 09:41:38.965 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : The response status is 200

2019-04-24 09:41:38.981 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Not registering with Eureka server per configuration

2019-04-24 09:41:39.010 INFO 2247 --- [ main] com.netflix.discovery.DiscoveryClient : Discovery Client initialized at timestamp 1556098899005 with initial instances count: 2

2019-04-24 09:41:39.020 INFO 2247 --- [ main] c.h.s.d.integration.DiscoveryService : hz.client_0 [dev] [3.12] Waiting for registration with Eureka...

2019-04-24 09:41:39.039 INFO 2247 --- [ main] c.h.s.d.integration.DiscoveryService : hz.client_0 [dev] [3.12] Registered in Eureka

2019-04-24 09:41:39.147 INFO 2247 --- [ main] c.h.client.spi.ClientInvocationService : hz.client_0 [dev] [3.12] Running with 2 response threads, dynamic=false

2019-04-24 09:41:39.502 INFO 2247 --- [ main] com.hazelcast.core.LifecycleService : hz.client_0 [dev] [3.12] HazelcastClient 3.12 (20190409 - 915d83a) is STARTING

2019-04-24 09:41:39.513 INFO 2247 --- [ main] com.hazelcast.core.LifecycleService : hz.client_0 [dev] [3.12] HazelcastClient 3.12 (20190409 - 915d83a) is STARTED

2019-04-24 09:41:39.750 INFO 2247 --- [ient_0.cluster-] c.h.c.c.nio.ClusterConnectorService : hz.client_0 [dev] [3.12] Trying to connect to cluster with name: dev

2019-04-24 09:41:39.755 INFO 2247 --- [ient_0.cluster-] c.h.s.d.integration.DiscoveryService : hz.client_0 [dev] [3.12] Waiting for registration with Eureka...

2019-04-24 09:41:39.762 INFO 2247 --- [ient_0.cluster-] c.h.s.d.integration.DiscoveryService : hz.client_0 [dev] [3.12] Registered in Eureka

2019-04-24 09:41:39.800 INFO 2247 --- [ient_0.cluster-] c.h.c.c.nio.ClusterConnectorService : hz.client_0 [dev] [3.12] Trying to connect to [10.0.0.86]:5703 as owner member

2019-04-24 09:41:40.121 INFO 2247 --- [nt_0.internal-1] c.h.c.c.ClientConnectionManager : hz.client_0 [dev] [3.12] Setting ClientConnection{alive=true, connectionId=1, channel=NioChannel{/10.0.0.86:49371->/10.0.0.86:5703}, remoteEndpoint=[10.0.0.86]:5703, lastReadTime=2019-04-24 09:41:40.095, lastWriteTime=2019-04-24 09:41:40.001, closedTime=never, connected server version=3.12} as owner with principal ClientPrincipal{uuid='86e1fdfa-1cda-4523-ae6b-a0e46e4c2454', ownerUuid='7843aafb-be5c-4f18-baf0-027807a956a9'}

2019-04-24 09:41:40.133 INFO 2247 --- [nt_0.internal-1] c.h.c.c.ClientConnectionManager : hz.client_0 [dev] [3.12] Authenticated with server [10.0.0.86]:5703, server version:3.12 Local address: /10.0.0.86:49371

2019-04-24 09:41:40.297 INFO 2247 --- [lient_0.event-1] c.h.c.spi.impl.ClientMembershipListener : hz.client_0 [dev] [3.12]

Members [2] {

Member [10.0.0.86]:5703 - 7843aafb-be5c-4f18-baf0-027807a956a9

Member [10.0.0.86]:5701 - b8d7683f-f07d-4a82-9893-0bc3b51e066f

}

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amey pande

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Apr 24, 2019, 9:36:34 AM4/24/19

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Thanks for quick response Rafal. I think that the connection is not through Eureka here. Any chance we can talk on Gmail phone call? I want to show you my configuration. There's nothing wrong with Docker networking as I run the services in docker swarm where all the services run under same network.

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Rafal Leszko

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Apr 24, 2019, 9:41:35 AM4/24/19

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Then, could I ask you to create GH issue here: https://github.com/hazelcast/hazelcast-eureka with the description and how to reproduce it?

It will make us quicker to resolve the issue then.

Cheers,

Rafał

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amey pande

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Apr 24, 2019, 9:56:44 AM4/24/19

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Thanks.

https://github.com/hazelcast/hazelcast-eureka/issues/29

Please let me know if there's a quick fix which I can try out.

Thank you.

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