Hi, Yes, Ignite will send messages to all nodes, but you may use filter:
ignite.message(ignite.cluster().forAttribute("topic1", Boolean.TRUE));
In this case messages would be sent to all nodes from the cluster group, in
this example - only nodes with set attribute "topic1" [1].
[1]
https://ignite.apache.org/releases/latest/javadoc/org/apache/ignite/configuration/IgniteConfiguration.html#setUserAttributes-java.util.Map-
-Dmitry
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