diff --git a/src/main/java/com/nhn/pinpoint/web/applicationmap/Node.java b/src/main/java/com/nhn/pinpoint/web/applicationmap/Node.java
index 46fb80399..ed73349f7 100644
--- a/src/main/java/com/nhn/pinpoint/web/applicationmap/Node.java
+++ b/src/main/java/com/nhn/pinpoint/web/applicationmap/Node.java
@@ -54,7 +54,6 @@ public class Node implements JsonSerializable {
         if (hostList != null) {
             // 이 put은 정확하지 않음.
             //		this.hostList.addHostList(hostList);
-            logger.debug("createApplication");
             this.hostList.put(hostList);
         }
 
@@ -112,7 +111,7 @@ public class Node implements JsonSerializable {
         if (node == null) {
             throw new NullPointerException("node must not be null");
         }
-        logger.debug("merge node this={}, node={}", this.application, node.application);
+        logger.trace("merge node this={}, node={}", this.application, node.application);
 		
         // 리얼 application을 실제빌드할때 copy하여 만들기 때문에. add할때 데이터를 hostList를 add해도 된다.
         this.hostList.addHostList(node.hostList);
diff --git a/src/main/java/com/nhn/pinpoint/web/mapper/MapStatisticsCalleeMapper.java b/src/main/java/com/nhn/pinpoint/web/mapper/MapStatisticsCalleeMapper.java
index c9d116827..65712a00f 100644
--- a/src/main/java/com/nhn/pinpoint/web/mapper/MapStatisticsCalleeMapper.java
+++ b/src/main/java/com/nhn/pinpoint/web/mapper/MapStatisticsCalleeMapper.java
@@ -33,10 +33,8 @@ public class MapStatisticsCalleeMapper implements RowMapper<List<LinkStatistics>
 		final KeyValue[] keyList = result.raw();
 
 		// key is destApplicationName.
-		final List<LinkStatistics> stat = new ArrayList<LinkStatistics>(keyList.length + 10);
+		final List<LinkStatistics> linkStatisticsList = new ArrayList<LinkStatistics>(keyList.length + 10);
 
-		// key is destApplicationName
-//		Map<String, Set<String>> callerAppHostMap = new HashMap<String, Set<String>>();
 
 		for (KeyValue kv : keyList) {
 
@@ -54,13 +52,13 @@ public class MapStatisticsCalleeMapper implements RowMapper<List<LinkStatistics>
 			boolean isError = histogramSlot == (short) -1;
 
 			if (logger.isDebugEnabled()) {
-			    logger.debug("    Fetched Callee. {} -> {} ({})", caller, callee, requestCount);
+			    logger.debug("    Fetched Callee. {} -> {} ({}) calleeHost", caller, callee, requestCount, calleeHost);
             }
 			
             LinkStatistics statistics = new LinkStatistics(caller, callee);
             statistics.addSample(calleeHost, callee.getServiceTypeCode(), (isError) ? (short) -1 : histogramSlot, requestCount);
 
-			stat.add(statistics);
+			linkStatisticsList.add(statistics);
 		}
 
 		// statistics에 dest host정보 삽입.
@@ -68,7 +66,7 @@ public class MapStatisticsCalleeMapper implements RowMapper<List<LinkStatistics>
 //			entry.getValue().addToHosts(callerAppHostMap.get(entry.getKey()));
 //		}
 
-		return stat;
+		return linkStatisticsList;
 	}
 
     private Application readCalleeApplication(byte[] qualifier) {
diff --git a/src/main/java/com/nhn/pinpoint/web/mapper/MapStatisticsCallerMapper.java b/src/main/java/com/nhn/pinpoint/web/mapper/MapStatisticsCallerMapper.java
index 8bdf40a10..e65f12408 100644
--- a/src/main/java/com/nhn/pinpoint/web/mapper/MapStatisticsCallerMapper.java
+++ b/src/main/java/com/nhn/pinpoint/web/mapper/MapStatisticsCallerMapper.java
@@ -31,8 +31,7 @@ public class MapStatisticsCallerMapper implements RowMapper<List<LinkStatistics>
         }
 		final KeyValue[] keyList = result.raw();
 
-		final List<LinkStatistics> stat = new ArrayList<LinkStatistics>(keyList.length + 10);
-
+		final List<LinkStatistics> linkStatisticsList = new ArrayList<LinkStatistics>(keyList.length + 10);
 
 		for (KeyValue kv : keyList) {
 
@@ -56,10 +55,10 @@ public class MapStatisticsCallerMapper implements RowMapper<List<LinkStatistics>
             LinkStatistics statistics = new LinkStatistics(callerApplication, calleeApplication);
             statistics.addSample(calleeHost, calleeApplication.getServiceTypeCode(), (isError) ? (short) -1 : histogramSlot, requestCount);
 
-            stat.add(statistics);
+            linkStatisticsList.add(statistics);
 		}
 
-		return stat;
+		return linkStatisticsList;
 	}
 
     private Application readCallerApplication(byte[] qualifier) {