public Collection<HostRequest> getCompletedHostRequests() {
    Collection<HostRequest> completedHostRequests = new ArrayList<>(allHostRequests);
    completedHostRequests.removeAll(outstandingHostRequests);
    completedHostRequests.removeAll(requestsWithReservedHosts.values());

    return completedHostRequests;
  }
Logical Request implementation used to provision a cluster deployed by Blueprints.
ambari-server/src/main/java/org/apache/ambari/server/topology/LogicalRequest.java