WildFly clustering basics
When two or more WildFly instances are started with an HA configuration (such as standalone-ha.xml), they form a cluster. In each of these instances, the selected web applications and EJBs can be easily clustered. We will look at these later on in this chapter. First, however, we will have investigate the foundations of clustering in WildFly.
The low-level parts of cluster communications in WildFly, such as discovery and group handling, are handled by technologies from an open source project called JGroups (http://www.jgroups.org). Higher-level functions, such as replication and data handling are performed using Infinispan (http://infinispan.org).
JGroups
The following text taken from the JGroups website provides us with a good introduction to JGroups:
JGroups is a toolkit for reliable messaging. It can be used to create clusters whose nodes can send messages to each other. The main features include the following:
- Cluster creation and deletion. Cluster nodes can be...
