Hazelcast can be used with dotCMS for both Cluster Transport and/or as a Cache Provider. The following documentation and setup information is required when setting up Hazelcast cache or when integrating Hazelcast with a clustered architecture.
For more information about Hazelcast, please visit the official Hazelcast website.
The following parameters in the dotmarketing-config.properties control the behavior of the Hazelcast cache.
- Note: It is strongly recommended that you make all changes to the dotmarketing-config.properties file through a properties extension file.
The following configuration property options enable Hazelcast:
Both Embedded (near) and Client (far) cluster transports are configured through “CACHE_INVALIDATION_TRANSPORT_CLASS” property on file “dotmarketing-config.properties” (Embedded is the default):
CACHE_INVALIDATION_TRANSPORT_CLASS=com.dotcms.cache.transport.HazelcastCacheTransportEmbedded (default) CACHE_INVALIDATION_TRANSPORT_CLASS=com.dotcms.cache.transport.HazelcastCacheTransportClient
Hazelcast Embedded (near) Configuration
To cluster Hazelcast as Embedded (default), use the Hazelcast network configuration on file “hazelcast-embedded.xml”:
This file is now automatically wired by default with corresponding ip-addresses and ports information of the cluster nodes (under/assuming/using TCP protocol). This auto-wiring process may be disabled by setting the following property to false in the
AUTOWIRE_CLUSTER_TRANSPORT=false (true by default)
WARNING: If disabled, file “hazelcast-embedded.xml” is assumed to have been pre-configured with the required network port and join configuration corresponding to the inherent Hazelcast instance and cluster members dotCMS is to be bound to; for instance:
<hazelcast> ... <network> ... <port auto-increment="true" port-count="100">7801</port> ... <join> ... <tcp-ip enabled="true"> <interface>127.0.0.1</interface> <member-list> ... <member>127.0.0.1:7801</member> <member>127.0.0.1:7802</member> ... </member-list> </tcp-ip> ... </join> ... </network> ... </hazelcast>
Hazelcast Client (far) Configuration
To cluster Hazelcast as Client, use the Hazelcast network configuration on file “hazelcast-client.xml”:
When using Hazelcast Client as either Cluster Transport or Cache Provider, Hazelcast Client configuration on file “hazelcast-client.xml” is assumed to be pre-configured with the ip-address and port of the corresponding external Hazelcast instance dotCMS is to be bound to; for instance:
<hazelcast-client> ... <network> ... <cluster-members> ... <address>127.0.0.1:7801</address> ... </cluster-members> ... </network> ... </hazelcast-client>
Hazelcast Client Setup Steps
Instructions to quickly setup and run dotCMS with Hazelcast Client (against external Hazelcast node/instance) may be summarized as follows:
Setup Hazelcast In-Memory Data Grid:
- Download Hazelcast from
- Uncompress Hazelcast to directory “
“, one Hazelcast node/instance per dotCMS instance in the cluster (on different directories if using nodes on same machine)
- Copy contents of file “
/webapps/ROOT/WEB-INF/classes/hazelcast-embedded.xml” into file “ /bin/hazelcast.xml”
- Assign a different port to each and every Hazelcast node/instance on file “
<hazelcast> ... <network> ... <port auto-increment="true" port-count="100">7801</port> ... </network> ... </hazelcast>
- Define the network join configuration on EACH and EVERY Hazelcast node/instance in the file “
/bin/hazelcast.xml”. If you are using TCP-IP join schema, this may look like:
<hazelcast> ... <network> ... <join> ... <tcp-ip enabled="true"> <interface>127.0.0.1</interface> <member-list> ... <member>127.0.0.1:7801</member> <member>127.0.0.1:7802</member> ... </member-list> </tcp-ip> ... </join> ... </network> ... </hazelcast>
- Configure “hazelcast-client.xml” on each and every dotCMS instance
<TOMCAT_LOCATION>/webapps/ROOT/WEB-INF/classes/hazelcast-client.xmlas detailed above
- Startup each and every Hazelcast node/instance by running “
- Startup each and every dotCMS instance! Make sure the associated Hazelcast nodes/instance(s) are up/clustered correctly before running dotCMS.
Cluster status information on dotCMS backend UI under the “System->Configuration->Network” tab in addition to helpful performance optimization information for distributed cache providers (Hazelcast and Redis).