public boolean dropCluster(final int iClusterId) {
   getLevel1Cache().freeCluster(iClusterId);
   return underlying.dropCluster(iClusterId);
 }
 public boolean dropCluster(final String iClusterName) {
   getLevel1Cache().freeCluster(getClusterIdByName(iClusterName));
   return underlying.dropCluster(iClusterName);
 }