/** {@inheritDoc} */
 @Override
 public boolean replace(K key, V oldVal, V newVal) throws IgniteCheckedException {
   return dht.replace(key, oldVal, newVal);
 }
 /** {@inheritDoc} */
 @Override
 public boolean replace(K key, V val) throws IgniteCheckedException {
   return dht.replace(key, val);
 }