code: public void forceRemovalInRegister(ArrayList<Node> ping) {
          for (Node pingNode : ping) {
              InvocationContext ctx = balancerRunner.getInvocationContext(
                      pingNode.getProperties().get("version"));
              //ctx.nodes.remove(pingNode);
              String instanceId = pingNode.getProperties().get("Restcomm-Instance-Id");
              if(instanceId!=null)
              	ctx.httpNodeMap.remove(instanceId);
              Integer smppPort = null;
              if(pingNode.getProperties().get("smppPort") != null)
              	smppPort = Integer.parseInt(pingNode.getProperties().get("smppPort"));
              if(smppPort!=null)
              	ctx.smppNodeMap.remove(new KeySmpp(pingNode));
              
              Boolean isIpV6=LbUtils.isValidInet6Address(pingNode.getIp());        	
              ctx.sipNodeMap(isIpV6).remove(new KeySip(pingNode,isIpV6));
              boolean nodePresent = false;
              Iterator<Node> nodesIterator = balancerRunner.balancerContext.aliveNodes.iterator();
              while (nodesIterator.hasNext() && !nodePresent) {
                  Node node = (Node) nodesIterator.next();
                  if (node.equals(pingNode)) {
                      nodePresent = true;
                  }
              }
              // removal done afterwards to avoid ConcurrentModificationException when removing the node while goign through the iterator
              if(nodePresent) {
              	
                  balancerRunner.balancerContext.aliveNodes.remove(pingNode);
                  ctx.balancerAlgorithm.nodeRemoved(pingNode);
                  if(logger.isInfoEnabled()) {
                      logger.info("NodeExpirationTimerTask Run NSync["
                              + pingNode + "] forcibly removed due to a clean shutdown of a node. Numbers of nodes present in the balancer : " 
                              + balancerRunner.balancerContext.aliveNodes.size());
                  }
              }					
          }
      }
docs: {@inheritDoc}