Wildfly/Infinispan domain. Keep distributed cache on separate nodes
03 November 2020
Previously i wrote about development of Jakarta EE application using distributed cache with Wildfly and Infinispan. This solution has a good fit for a small clustered environments where data distribution between nodes will not costs too much. In case you are looking for clustered environment where application scaling should have minimum impact on cache and vice versa, but by some reason you wouldn't like to use a separate infinispan-server cluster as remote-cache-container then next topology can be a solution:
To make it work we need to configure distributed-cache for two server groups and provide zero capacity-factor for one of them. Below is simple configuration example:
# clone current profile
/profile=full-ha:clone(to-profile=full-ha-cache)
# Create cache server group based on new profile
/server-group=cache-servers:add(profile=full-ha-cache, socket-binding-group=full-ha-sockets)
# Add cache container and distributed cache for both profiles
/profile=full-ha/subsystem=infinispan/cache-container=mycachecontainer:add(statistics-enabled=true)
/profile=full-ha-cache/subsystem=infinispan/cache-container=mycachecontainer:add(statistics-enabled=true)
/profile=ful-ha-cache/subsystem=infinispan/cache-container=mycachecontainer/distributed-cache=mycache:add()
/profile=full-ha/subsystem=infinispan/cache-container=mycachecontainer/distributed-cache=mycache:add()
# Create cache servers
/host=master/server-config=cache1:add(group=cache-servers,socket-binding-port-offset=500)
/host=master/server-config=cache1:start(blocking=true)
/host=master/server-config=cache2:add(group=cache-servers,socket-binding-port-offset=600)
/host=master/server-config=cache2:start(blocking=true)
# Configure ZERO capacity for profile which we will use for application
/profile=full-ha/subsystem=infinispan/cache-container=mycachecontainer/distributed-cache=mycache:write-attribute(name=capacity-factor, value=0)
# Provide transport
/profile=full-ha/subsystem=infinispan/cache-container=mycachecontainer/transport=jgroups:add()
/profile=ful-ha-cache/subsystem=infinispan/cache-container=mycachecontainer/transport=jgroups:add()
Now let's deploy our application on two server groups
deploy jcache-examples.war --server-groups=backend-servers,cache-servers
You can check cached number-of-entries on each server by
/host=master/server=backend1/subsystem=infinispan/cache-container=mycachecontainer/distributed-cache=mycache:read-resource(include-runtime=true)
/host=master/server=cache1/subsystem=infinispan/cache-container=mycachecontainer/distributed-cache=mycache:read-resource(include-runtime=true)
And be sure that application backend-servers will always show "number-of-entries" => 0