diff --git a/src/main/java/com/nhn/pinpoint/web/applicationmap/rawdata/TransactionFlowStatistics.java b/src/main/java/com/nhn/pinpoint/web/applicationmap/rawdata/TransactionFlowStatistics.java
index 6d5395062..88e6ca21d 100644
--- a/src/main/java/com/nhn/pinpoint/web/applicationmap/rawdata/TransactionFlowStatistics.java
+++ b/src/main/java/com/nhn/pinpoint/web/applicationmap/rawdata/TransactionFlowStatistics.java
@@ -17,18 +17,18 @@ import com.nhn.pinpoint.web.util.Mergeable;
  */
 public class TransactionFlowStatistics implements Mergeable<String, TransactionFlowStatistics> {
 
-	protected String id;
-	protected String from;
-	protected ServiceType fromServiceType;
-	protected String to;
-	protected ServiceType toServiceType;
+	private String id;
+    private String from;
+    private ServiceType fromServiceType;
+    private String to;
+    private ServiceType toServiceType;
 
 	/**
 	 * key = hostname
 	 */
-	protected Map<String, Host> toHostList;
-	
-	protected Set<AgentInfoBo> toAgentSet;
+    private Map<String, Host> toHostList;
+
+    private Set<AgentInfoBo> toAgentSet;
 
 	public TransactionFlowStatistics(String from, short fromServiceType, String to, short toServiceType) {
 		this.from = from;
diff --git a/src/main/java/com/nhn/pinpoint/web/service/FilteredApplicationMapServiceImpl.java b/src/main/java/com/nhn/pinpoint/web/service/FilteredApplicationMapServiceImpl.java
index 3e7410e1d..312ce2ae0 100755
--- a/src/main/java/com/nhn/pinpoint/web/service/FilteredApplicationMapServiceImpl.java
+++ b/src/main/java/com/nhn/pinpoint/web/service/FilteredApplicationMapServiceImpl.java
@@ -23,7 +23,6 @@ import com.nhn.pinpoint.common.bo.SpanBo;
 import com.nhn.pinpoint.common.bo.SpanEventBo;
 import com.nhn.pinpoint.web.applicationmap.ApplicationMap;
 import com.nhn.pinpoint.web.applicationmap.rawdata.TransactionFlowStatistics;
-import com.nhn.pinpoint.web.applicationmap.rawdata.TransactionFlowStatisticsUtils;
 import com.nhn.pinpoint.web.dao.AgentInfoDao;
 import com.nhn.pinpoint.web.dao.ApplicationIndexDao;
 import com.nhn.pinpoint.web.dao.ApplicationTraceIndexDao;
@@ -42,7 +41,7 @@ import com.nhn.pinpoint.web.vo.TransactionId;
 @Service
 public class FilteredApplicationMapServiceImpl implements FilteredApplicationMapService {
 
-	private Logger logger = LoggerFactory.getLogger(this.getClass());
+	private final Logger logger = LoggerFactory.getLogger(this.getClass());
 
 	@Autowired
 	private TraceDao traceDao;
@@ -290,7 +289,9 @@ public class FilteredApplicationMapServiceImpl implements FilteredApplicationMap
             timeSeriesStore.add(spanEventStatId, span.getStartTime() + spanEvent.getStartElapsed(), slot2, 1L, spanEvent.hasException());
 
             // application timeseries statistics
-            timeSeriesStore.add(new SimpleNodeId(spanEvent.getDestinationId()), span.getCollectorAcceptTime(), slot2, 1L, spanEvent.hasException());
+//            NodeId key = new ComplexNodeId(Node.EMPTY, new Node(spanEvent.getDestinationId()));
+            NodeId key = new SimpleNodeId(spanEvent.getDestinationId());
+            timeSeriesStore.add(key, span.getCollectorAcceptTime(), slot2, 1L, spanEvent.hasException());
         }
     }
 
diff --git a/src/main/java/com/nhn/pinpoint/web/service/Node.java b/src/main/java/com/nhn/pinpoint/web/service/Node.java
index 2f3ed8514..a9db5ac7b 100644
--- a/src/main/java/com/nhn/pinpoint/web/service/Node.java
+++ b/src/main/java/com/nhn/pinpoint/web/service/Node.java
@@ -6,9 +6,22 @@ import com.nhn.pinpoint.common.ServiceType;
  * @author emeroad
  */
 public class Node {
+
+    public static final Node EMPTY = new Node();
+
     private String name;
     private ServiceType serviceType;
 
+    public Node() {
+    }
+
+    public Node(String name) {
+        if (name == null) {
+            throw new NullPointerException("name must not be null");
+        }
+        this.name = name;
+    }
+
     public Node(String name, ServiceType serviceType) {
         if (name == null) {
             throw new NullPointerException("name must not be null");
@@ -55,7 +68,7 @@ public class Node {
 
         Node node = (Node) o;
 
-        if (!name.equals(node.name)) return false;
+        if (name != null ? !name.equals(node.name) : node.name != null) return false;
         if (serviceType != node.serviceType) return false;
 
         return true;
@@ -63,8 +76,8 @@ public class Node {
 
     @Override
     public int hashCode() {
-        int result = name.hashCode();
-        result = 31 * result + serviceType.hashCode();
+        int result = name != null ? name.hashCode() : 0;
+        result = 31 * result + (serviceType != null ? serviceType.hashCode() : 0);
         return result;
     }
 
diff --git a/src/main/java/com/nhn/pinpoint/web/service/SimpleNodeId.java b/src/main/java/com/nhn/pinpoint/web/service/SimpleNodeId.java
index 0eb3a6648..f7ce7dbde 100644
--- a/src/main/java/com/nhn/pinpoint/web/service/SimpleNodeId.java
+++ b/src/main/java/com/nhn/pinpoint/web/service/SimpleNodeId.java
@@ -3,7 +3,8 @@ package com.nhn.pinpoint.web.service;
 /**
  * @author emeroad
  */
-public class SimpleNodeId implements NodeId{
+@Deprecated
+public class SimpleNodeId implements NodeId {
     private String key;
 
     public SimpleNodeId(String key) {
diff --git a/src/main/java/com/nhn/pinpoint/web/util/Mergeable.java b/src/main/java/com/nhn/pinpoint/web/util/Mergeable.java
index b4b29316e..6e7dd6692 100644
--- a/src/main/java/com/nhn/pinpoint/web/util/Mergeable.java
+++ b/src/main/java/com/nhn/pinpoint/web/util/Mergeable.java
@@ -5,10 +5,10 @@ import com.nhn.pinpoint.web.service.NodeId;
 /**
  * 
  * @author netspider
- * 
- * @param <T>
+ * @param <K>
+ * @param <V>
  */
-public interface Mergeable<I, T> {
-	public I getId();
-	public T mergeWith(T o);
+public interface Mergeable<K, V> {
+	public K getId();
+	public V mergeWith(V o);
 }