What is the difference between ModClusterService and HAModClusterService?

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Issue

I see that ModClusterService or HAModClusterService can be used when configuring mod_cluster. What is the difference between these?

Environment

JBoss Enterprise Application Platform (EAP)
- 5.x
JBoss Enterprise Web Server (EWS)
- 1.0.x
- Apache httpd
- mod_cluster

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