code: private Node<K, V> getNodeFromStore(final int nodeid) {
  		final int index = nodeid < 0 ? -nodeid : nodeid;
  		final ByteBuffer buf = storage.get(index);
  		final Node<K, V> node = Node.deserialize(buf, this);
  		if (rootIdx == node.id) {
  			log.warn(this.getClass().getName() + "::getNodeFromStore(" + nodeid + ") WARN LOADED ROOT NODE");
  		}
  		storage.release(buf);
  		if (enableIOStats) {
  			getIOStat(nodeid).incPhysRead();
  		}
  		return node;
  	}
docs: Get node from file
  
  @param nodeid int with nodeid
  @return Node<K,V>