Infrastructure

The call sequence to get the list of target nodes is roughly:

ReplicationManager.processPid()
ReplicationManager.getPotentialTargetNodes()
ReplicationManager.getNodeReferences()
NodeRegistryServiceImpl.listNodes()
NodeFacade.getApprovedNodeList()
NodeAccess.getApprovedNodeList()

It does not appear that the up/down status of a node is examined. Seems the appropriate place to do this would be in ReplicationManager.getPotentialTargetNodes() as this is where previous attempts are examined and the node rejected if too many failures are reported in a time period. Having a check for node up/down status here is logical.