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In mutinode lets say N1, N2 and N3. I have been directly hitting to the node N1 but what happens is hazelcast communicates to N2 and N3 for some reason. Its not an Heart beat check since its configured for 1 min, But I observed using the wireshark, it clearly shows that the call goes to another node (i.e) from N1 to N2.
It clearly shows that when I hit a query to N1, that query is transmitted to N2. I saw the query and data received in wireshark.
Am pretty confused why its happening, All the data's has to be there in Node 1, But why its going to another node for fetching the data?
Thanks, Harry
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To create multiple nodes we can start the multiple instances of ServerNode application. As a result, Hazelcast will automatically create and add a new member to the cluster. For example, if we run the ServerNode application again, we'll see the following log in the console which says that there are two members in the cluster.
1. Overview This is an introductory article on Hazelcast where we'll see how to create a cluster member, a distributed Map to share data among the cluster nodes, and create a Java client to connect and query data in the cluster. 2. What Is Hazelcast? Hazelcast is a distributed In-Memory Data Grid platform for Java.
It is because, unlike other caches, Hazelcast is a distributed cache, that is, it spreads the data across machines/JVM. Although Hazelcast can work very well on single JVM as well, however, it is more useful is a distributed environment.
Create a Hazelcast Member Members (also called nodes) automatically join together to form a cluster. This automatic joining takes place with various discovery mechanisms that the members use to find each other. Let's create a member that stores data in a Hazelcast distributed map:
Data in Hazelcast is partitioned, therefore it doesn't matter to what node you add the data, there is no guarantee that the record will be stored on this node. That means there is communication going on to store / read data in a partitioned fashion. You probably want to read on data partitioning: http://docs.hazelcast.org/docs/3.6/manual/html-single/index.html#data-partitioning
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