Client problem connecting to a cluster with multicast configuration

[Paolo Di Tommaso]

Dear all, 

I'm unable to manage to connect to an Hazelcast cluster, that uses a "multicast" network configuration, from a client application, in the same network, that using this code: 

HazelcastClient.newHazelcastClient( new ClientConfig() )

The exception raised is the following. Any idea what's wrong with it?  

Mar-04 12:09:05.748 [hz.client_0_nextflow.cluster-listener] DEBUG c.h.client.spi.ClientClusterService - IO error during initial connection...

java.net.ConnectException: Connection refused

at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.7.0_51]

at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) ~[na:1.7.0_51]

at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) ~[na:1.7.0_51]

at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) ~[na:1.7.0_51]

at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.7.0_51]

at java.net.Socket.connect(Socket.java:579) ~[na:1.7.0_51]

at com.hazelcast.client.connection.ConnectionImpl.<init>(ConnectionImpl.java:79) ~[hazelcast-all-3.1.6.jar:3.1.6]

at com.hazelcast.client.connection.SmartClientConnectionManager.newConnection(SmartClientConnectionManager.java:101) ~[hazelcast-all-3.1.6.jar:3.1.6]

at com.hazelcast.client.spi.impl.ClientClusterServiceImpl.connectToOne(ClientClusterServiceImpl.java:533) [hazelcast-all-3.1.6.jar:3.1.6]

at com.hazelcast.client.spi.impl.ClientClusterServiceImpl.access$900(ClientClusterServiceImpl.java:59) [hazelcast-all-3.1.6.jar:3.1.6]

at com.hazelcast.client.spi.impl.ClientClusterServiceImpl$ClusterListenerThread.pickConnection(ClientClusterServiceImpl.java:420) [hazelcast-all-3.1.6.jar:3.1.6]

at com.hazelcast.client.spi.impl.ClientClusterServiceImpl$ClusterListenerThread.run(ClientClusterServiceImpl.java:384) [hazelcast-all-3.1.6.jar:3.1.6]

Mar-04 12:09:05.751 [hz.client_0_nextflow.cluster-listener] DEBUG c.h.client.spi.ClientClusterService - IO error during initial connection...

Cheers,

Paolo

[Peter Veentjer]

It could be that multicast is not supported on your network or operating system.

Try to use regular tcpip discovery and see if that works.

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[Peter Veentjer]

Apparently I did not drink enough or too much coffee.

Clients don't have multicast.

The client will connect to localhost if nothing configured. If you Hazelcast cluster members are running on different machines, you need to give the ip address of at least one of them in the client config. It is better to have more than 1 ip address to make sure that the client is able to connect.

[Paolo Di Tommaso]

Hi Pete,

But if it works for the nodes, why should not work for the client app?

Best, p

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[Peter Veentjer]

The client doesn't support multicast. So it isn't able to find members in the cluster. I guess you are using multicast for member discovery, right?

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[Paolo Di Tommaso]

Yes. I was supposing that I could use the multicast discovery also from the client.

Ok, if so I will try changing it.

Best, p

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