High CPU and heap overhead in JMX when many rars are deployed

Issue

• We have many (hundreds) of rars deployed. We noticed substantial increased heap usage in this case and CPU is persistently high when we connect via JMX and mbeans are never rendered when viewed via jconsole. The heap dump shows the org.jboss.as.connector.subsystems.resourceadapters.IronJacamarResources are quite large. And thread dumps show CPU is high in calls like the following:

"RMI TCP Connection(1)-127.0.0.1" #100 daemon prio=9 os_prio=0 tid=0x00007f02240c5000 nid=0x3a43 runnable [0x00007f024d6f7000]
   java.lang.Thread.State: RUNNABLE
        at java.security.AccessController.getStackAccessControlContext(Native Method)
        at java.security.AccessController.getContext(AccessController.java:820)
        at org.jboss.as.controller.SecurityActions.getCaller(SecurityActions.java:132)
        at org.jboss.as.controller.AbstractOperationContext.getCaller(AbstractOperationContext.java:1017)
        at org.jboss.as.controller.OperationContextImpl.authorize(OperationContextImpl.java:1284)
        at org.jboss.as.controller.OperationContextImpl.readResourceFromRoot(OperationContextImpl.java:646)
        at org.jboss.as.controller.OperationContextImpl.readResourceFromRoot(OperationContextImpl.java:632)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.addParentResource(ReadResourceDescriptionHandler.java:786)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.getAllActualResourceAddresses(ReadResourceDescriptionHandler.java:774)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.getAllActualResourceAddresses(ReadResourceDescriptionHandler.java:778)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.getAllActualResourceAddresses(ReadResourceDescriptionHandler.java:778)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.getAllActualResourceAddresses(ReadResourceDescriptionHandler.java:778)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.getAllActualResourceAddresses(ReadResourceDescriptionHandler.java:778)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.getAllActualResourceAddresses(ReadResourceDescriptionHandler.java:778)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.getLocalResourceAddresses(ReadResourceDescriptionHandler.java:713)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.initLocalResourceAddresses(ReadResourceDescriptionHandler.java:702)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler$ReadResourceDescriptionAccessControlContext.access$200(ReadResourceDescriptionHandler.java:689)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler.doExecuteInternal(ReadResourceDescriptionHandler.java:204)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler.doExecute(ReadResourceDescriptionHandler.java:162)
        at org.jboss.as.controller.operations.global.ReadResourceDescriptionHandler.execute(ReadResourceDescriptionHandler.java:155)
        at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:702)
        at org.jboss.as.controller.AbstractOperationContext.doCompleteStep(AbstractOperationContext.java:537)
        at org.jboss.as.controller.AbstractOperationContext.completeStepInternal(AbstractOperationContext.java:338)
        at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:314)
        at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1144)
        at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:331)
        at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:188)
        at org.jboss.as.jmx.model.ResourceAccessControlUtil.getResourceAccess(ResourceAccessControlUtil.java:85)
        at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:51)
        at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:61)
        at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:61)
        at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:61)
        at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:61)
        at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:61)
        at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:61)
        at org.jboss.as.jmx.model.RootResourceIterator.iterate(RootResourceIterator.java:43)