code: public static void validateClusterZonesSame(final Cluster lhs, final Cluster rhs) {
          Set<Zone> lhsSet = new HashSet<Zone>(lhs.getZones());
          Set<Zone> rhsSet = new HashSet<Zone>(rhs.getZones());
          if(!lhsSet.equals(rhsSet))
              throw new VoldemortException("Zones are not the same [ lhs cluster zones ("
                                           + lhs.getZones() + ") not equal to rhs cluster zones ("
                                           + rhs.getZones() + ") ]");
      }
docs: Confirms that both clusters have the same set of zones defined.
  
  @param lhs
  @param rhs