Provide Support for Clustered Singleton MDBs -------------------------------------------- Key: WFLY-4661 URL: https://issues.jboss.org/browse/WFLY-4661 Project: WildFly Issue Type: Feature Request Components: Clustering, JMS Affects Versions: 10.0.0.Alpha1 Reporter: Flavia Rainone Assignee: Flavia Rainone Priority: Minor Fix For: 10.0.0.Final Provide Support for Clustered Singleton MDBs. Provide annotation and configuration support to mark such MDB deployments Clustered Singleton MDBs. When "Clustered Singleton MDBs" are deployed in a cluster; only one node (server) is active to consume messages serially. When the node fails; another the active node's "Clustered Singleton MDBs" starts consuming the messages. To mark an MDB as clustered singleton, one can either use the clustered-singleton xml element, like this: <jboss:ejb-jar xmlns:jboss="http://www.jboss.com/xml/ns/javaee" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:c="urn:clustering:1.1" xmlns:d="urn:delivery-active:1.1" xsi:schemaLocation="http://www.jboss.com/xml/ns/javaee http://www.jboss.org/j2ee/schema/jboss-ejb3-2_0.xsd http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_1.xsd" version="3.1" impl-version="2.0"> <c:clustering> <ejb-name>HelloWorldQueueMDB</ejb-name> <c:clustered-singleton>true</c:clustered-singleton> </c:clustering> </jboss:ejb-jar> Or one can use the @org.jboss.ejb3.annotation.ClusteredSingleton in your MDB class. This feature requires no extra configuration at the server, apart from running the service in a cluster.