diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/AnalysisServerDriver.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/AnalysisServerDriver.java
index 02ebee054..273b753a0 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/AnalysisServerDriver.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/AnalysisServerDriver.java
@@ -7,14 +7,10 @@ import java.util.Date;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
-import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hbase.MetaTableAccessor;
-import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Scan;
 import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.mapreduce.Job;
-import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
 import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
 import org.apache.hadoop.util.GenericOptionsParser;
 import org.apache.hadoop.util.Tool;
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Categorize2ChainMapper.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Categorize2ChainMapper.java
index fb7b114cf..3f76debd7 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Categorize2ChainMapper.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Categorize2ChainMapper.java
@@ -43,7 +43,7 @@ public class Categorize2ChainMapper extends TableMapper<Text, ChainInfo> {
     }
 
     public static ChainInfo spanToChainInfo(String key, List<Span> spanList) {
-        CostMap costMap = new CostMap();
+        SubLevelSpanCostCounter costMap = new SubLevelSpanCostCounter();
         ChainInfo chainInfo = new ChainInfo();
         Collections.sort(spanList, new Comparator<Span>() {
             @Override
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Categorize2ChainReducer.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Categorize2ChainReducer.java
index d87a71894..437e7d36b 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Categorize2ChainReducer.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Categorize2ChainReducer.java
@@ -27,7 +27,7 @@ public class Categorize2ChainReducer extends Reducer<Text, ChainInfo, Text, IntW
         int totalCount = 0;
         try {
             ChainRelationship chainRelate = HBaseUtil.selectCallChainRelationship(key.toString());
-            Summary summary = new Summary();
+            ChainSummary summary = new ChainSummary();
             while (chainInfoIterator.hasNext()) {
                 ChainInfo chainInfo = chainInfoIterator.next();
                 try {
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Summary.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/ChainSummary.java
similarity index 97%
rename from skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Summary.java
rename to skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/ChainSummary.java
index c54e66107..be6804648 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/Summary.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/ChainSummary.java
@@ -12,12 +12,12 @@ import java.text.SimpleDateFormat;
 import java.util.*;
 import java.util.Date;
 
-public class Summary {
+public class ChainSummary {
 
     private Map<String, ChainSpecificTimeWindowSummary> summaryResultMap;
     private Map<String, Timestamp> updateChainInfo;
 
-    public Summary() {
+    public ChainSummary() {
         summaryResultMap = new HashMap<String, ChainSpecificTimeWindowSummary>();
         updateChainInfo = new HashMap<String, Timestamp>();
     }
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/SpanEntry.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/SpanEntry.java
index ba28bcb29..a0f2a1be2 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/SpanEntry.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/SpanEntry.java
@@ -8,7 +8,6 @@ public class SpanEntry {
 
     private Span clientSpan;
     private Span serverSpan;
-    private String startTime;
 
     public SpanEntry() {
 
@@ -66,7 +65,7 @@ public class SpanEntry {
         return resultCost;
     }
 
-    public long getClientCost() {
+    private long getClientCost() {
         if (clientSpan != null) {
             return clientSpan.getCost();
         }
@@ -74,7 +73,7 @@ public class SpanEntry {
         return 0;
     }
 
-    public long getServerCost() {
+    private long getServerCost() {
         if (serverSpan != null) {
             return serverSpan.getCost();
         }
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/CostMap.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/SubLevelSpanCostCounter.java
similarity index 92%
rename from skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/CostMap.java
rename to skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/SubLevelSpanCostCounter.java
index 7d19d18ff..76d612876 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/CostMap.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/SubLevelSpanCostCounter.java
@@ -3,7 +3,7 @@ package com.ai.cloud.skywalking.analysis.categorize2chain;
 import java.util.HashMap;
 import java.util.Map;
 
-public class CostMap {
+public class SubLevelSpanCostCounter {
     private Map<String, Long> costs = new HashMap<String, Long>();
 
     public void put(String parentLevel, Long cost) {
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/SpanNodeProcessFilter.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/SpanNodeProcessFilter.java
index 7a0e4f348..03782b8de 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/SpanNodeProcessFilter.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/SpanNodeProcessFilter.java
@@ -1,6 +1,6 @@
 package com.ai.cloud.skywalking.analysis.categorize2chain.filter;
 
-import com.ai.cloud.skywalking.analysis.categorize2chain.CostMap;
+import com.ai.cloud.skywalking.analysis.categorize2chain.SubLevelSpanCostCounter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.SpanEntry;
 import com.ai.cloud.skywalking.analysis.categorize2chain.model.ChainNode;
 
@@ -8,9 +8,9 @@ public abstract class SpanNodeProcessFilter {
 
     private SpanNodeProcessFilter nextProcessChain;
 
-    public abstract void doFilter(SpanEntry spanEntry, ChainNode node, CostMap costMap);
+    public abstract void doFilter(SpanEntry spanEntry, ChainNode node, SubLevelSpanCostCounter costMap);
 
-    protected void doNext(SpanEntry spanEntry, ChainNode node, CostMap costMap){
+    protected void doNext(SpanEntry spanEntry, ChainNode node, SubLevelSpanCostCounter costMap){
     	if(nextProcessChain != null){
     		nextProcessChain.doFilter(spanEntry, node, costMap);
     	}
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/AppendBusinessKeyFilter.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/AppendBusinessKeyFilter.java
index b4ec32d51..cb136f175 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/AppendBusinessKeyFilter.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/AppendBusinessKeyFilter.java
@@ -1,6 +1,6 @@
 package com.ai.cloud.skywalking.analysis.categorize2chain.filter.impl;
 
-import com.ai.cloud.skywalking.analysis.categorize2chain.CostMap;
+import com.ai.cloud.skywalking.analysis.categorize2chain.SubLevelSpanCostCounter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.SpanEntry;
 import com.ai.cloud.skywalking.analysis.categorize2chain.filter.SpanNodeProcessFilter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.model.ChainNode;
@@ -8,7 +8,7 @@ import com.ai.cloud.skywalking.analysis.categorize2chain.model.ChainNode;
 public class AppendBusinessKeyFilter extends SpanNodeProcessFilter {
 
     @Override
-    public void doFilter(SpanEntry spanEntry, ChainNode node, CostMap costMap) {
+    public void doFilter(SpanEntry spanEntry, ChainNode node, SubLevelSpanCostCounter costMap) {
         node.setViewPoint(node.getViewPoint() + spanEntry.getBusinessKey());
 
         this.doNext(spanEntry, node, costMap);
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/CopyAttrFilter.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/CopyAttrFilter.java
index 20cd9644d..e577a2ab0 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/CopyAttrFilter.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/CopyAttrFilter.java
@@ -1,6 +1,6 @@
 package com.ai.cloud.skywalking.analysis.categorize2chain.filter.impl;
 
-import com.ai.cloud.skywalking.analysis.categorize2chain.CostMap;
+import com.ai.cloud.skywalking.analysis.categorize2chain.SubLevelSpanCostCounter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.SpanEntry;
 import com.ai.cloud.skywalking.analysis.categorize2chain.filter.SpanNodeProcessFilter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.model.ChainNode;
@@ -8,7 +8,7 @@ import com.ai.cloud.skywalking.analysis.categorize2chain.model.ChainNode;
 public class CopyAttrFilter extends SpanNodeProcessFilter {
 
     @Override
-    public void doFilter(SpanEntry spanEntry, ChainNode node, CostMap costMap) {
+    public void doFilter(SpanEntry spanEntry, ChainNode node, SubLevelSpanCostCounter costMap) {
         node.setCallType(spanEntry.getCallType().toString());
         node.setStatus(spanEntry.getSpanStatus());
         node.setLevelId(spanEntry.getLevelId());
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/ProcessCostTimeFilter.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/ProcessCostTimeFilter.java
index 630914f06..5b188e7de 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/ProcessCostTimeFilter.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/ProcessCostTimeFilter.java
@@ -1,13 +1,13 @@
 package com.ai.cloud.skywalking.analysis.categorize2chain.filter.impl;
 
-import com.ai.cloud.skywalking.analysis.categorize2chain.CostMap;
+import com.ai.cloud.skywalking.analysis.categorize2chain.SubLevelSpanCostCounter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.SpanEntry;
 import com.ai.cloud.skywalking.analysis.categorize2chain.filter.SpanNodeProcessFilter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.model.ChainNode;
 
 public class ProcessCostTimeFilter extends SpanNodeProcessFilter {
 	@Override
-	public void doFilter(SpanEntry spanEntry, ChainNode node, CostMap costMap) {
+	public void doFilter(SpanEntry spanEntry, ChainNode node, SubLevelSpanCostCounter costMap) {
 		node.setCost(spanEntry.getCost());
 		
 		this.saveCostAsSubNodeCost(spanEntry, node, costMap);
@@ -17,7 +17,7 @@ public class ProcessCostTimeFilter extends SpanNodeProcessFilter {
 	}
 
 	private void saveCostAsSubNodeCost(SpanEntry spanEntry, ChainNode node,
-			CostMap costMap) {
+			SubLevelSpanCostCounter costMap) {
 		long subNodeCost = spanEntry.getCost();
 		if (costMap.exists(spanEntry.getParentLevelId())) {
 			subNodeCost += costMap.get(spanEntry.getParentLevelId());
@@ -26,7 +26,7 @@ public class ProcessCostTimeFilter extends SpanNodeProcessFilter {
 		costMap.put(spanEntry.getParentLevelId(), subNodeCost);
 	}
 
-	private void computeChainNodeCost(CostMap costMap, ChainNode node) {
+	private void computeChainNodeCost(SubLevelSpanCostCounter costMap, ChainNode node) {
 		String levelId = node.getParentLevelId();
 		if (levelId != null && levelId.length() > 0) {
 			levelId += ".";
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/ReplaceAddressFilter.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/ReplaceAddressFilter.java
index 77423b44d..87e47d43c 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/ReplaceAddressFilter.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/ReplaceAddressFilter.java
@@ -1,6 +1,6 @@
 package com.ai.cloud.skywalking.analysis.categorize2chain.filter.impl;
 
-import com.ai.cloud.skywalking.analysis.categorize2chain.CostMap;
+import com.ai.cloud.skywalking.analysis.categorize2chain.SubLevelSpanCostCounter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.SpanEntry;
 import com.ai.cloud.skywalking.analysis.categorize2chain.filter.SpanNodeProcessFilter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.model.ChainNode;
@@ -11,7 +11,7 @@ public class ReplaceAddressFilter extends SpanNodeProcessFilter {
     private static String IP_PORT_REGEX = "(([0-9]|[1-9][0-9]|1([0-9][0-9])|2([0-4][0-9]|5[0-5]))\\.([0-9]|[1-9][0-9]|1([0-9][0-9])|2([0-4][0-9]|5[0-5]))\\.([0-9]|[1-9][0-9]|1([0-9][0-9])|2([0-4][0-9]|5[0-5]))\\.([0-9]|[1-9][0-9]|1([0-9][0-9])|2([0-4][0-9]|5[0-5]))|localhost):([1-5][0-9]{4}|6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5]|[0-9]{1,4})";
 
     @Override
-    public void doFilter(SpanEntry spanEntry, ChainNode node, CostMap costMap) {
+    public void doFilter(SpanEntry spanEntry, ChainNode node, SubLevelSpanCostCounter costMap) {
 
         String viewPoint = spanEntry.getViewPoint().replaceAll(IP_PORT_REGEX, spanEntry.getApplicationId());
         node.setViewPoint(viewPoint);
diff --git a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/TokenGenerateFilter.java b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/TokenGenerateFilter.java
index b0765ba85..2c49d40e2 100644
--- a/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/TokenGenerateFilter.java
+++ b/skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/categorize2chain/filter/impl/TokenGenerateFilter.java
@@ -1,6 +1,6 @@
 package com.ai.cloud.skywalking.analysis.categorize2chain.filter.impl;
 
-import com.ai.cloud.skywalking.analysis.categorize2chain.CostMap;
+import com.ai.cloud.skywalking.analysis.categorize2chain.SubLevelSpanCostCounter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.SpanEntry;
 import com.ai.cloud.skywalking.analysis.categorize2chain.filter.SpanNodeProcessFilter;
 import com.ai.cloud.skywalking.analysis.categorize2chain.model.ChainNode;
@@ -9,7 +9,7 @@ import com.ai.cloud.skywalking.analysis.util.TokenGenerator;
 public class TokenGenerateFilter extends SpanNodeProcessFilter {
 
     @Override
-    public void doFilter(SpanEntry spanEntry, ChainNode node, CostMap costMap) {
+    public void doFilter(SpanEntry spanEntry, ChainNode node, SubLevelSpanCostCounter costMap) {
 
         String nodeToken = TokenGenerator.generateNodeToken(node.getParentLevelId() + "." + node.getLevelId() +
                 "-" + node.getViewPoint());