title: Is DistributedPubSub mediator stashing the messages for unreachable members of the cluster
body: <p>In a clustered environment, we are sending the message through DistributedPubSub mediator. So, we've some machines which are unreachable in the cluster, when the message was sent. And these machines comes reachable again before the "autodowning" has expired, then these machines do get the messages.</p>
  
  <p>Does this mean that DistributedPubSub mediator stashes the messages for the unreachable members of the cluster and delivers them when they become reachable again?</p>