diff --git a/apm-collector/apm-collector-worker/src/main/java/org/skywalking/apm/collector/worker/tracedag/TraceDagDataBuilder.java b/apm-collector/apm-collector-worker/src/main/java/org/skywalking/apm/collector/worker/tracedag/TraceDagDataBuilder.java
index 9ac0d1603..ed616bd5c 100644
--- a/apm-collector/apm-collector-worker/src/main/java/org/skywalking/apm/collector/worker/tracedag/TraceDagDataBuilder.java
+++ b/apm-collector/apm-collector-worker/src/main/java/org/skywalking/apm/collector/worker/tracedag/TraceDagDataBuilder.java
@@ -2,6 +2,8 @@ package org.skywalking.apm.collector.worker.tracedag;
 
 import com.google.gson.JsonArray;
 import com.google.gson.JsonObject;
+import java.util.HashMap;
+import java.util.Map;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.skywalking.apm.collector.worker.Const;
@@ -9,9 +11,6 @@ import org.skywalking.apm.collector.worker.node.NodeCompIndex;
 import org.skywalking.apm.collector.worker.node.NodeMappingIndex;
 import org.skywalking.apm.collector.worker.noderef.NodeRefIndex;
 
-import java.util.HashMap;
-import java.util.Map;
-
 /**
  * @author pengys5
  */
@@ -28,7 +27,7 @@ public class TraceDagDataBuilder {
     private JsonArray lineArray = new JsonArray();
 
     public JsonObject build(JsonArray nodeCompArray, JsonArray nodesMappingArray, JsonArray nodeRefsArray,
-                            JsonArray resSumArray) {
+        JsonArray resSumArray) {
         changeMapping2Map(nodesMappingArray);
         changeNodeComp2Map(nodeCompArray);
         resSumMerge(resSumArray);
@@ -57,7 +56,7 @@ public class TraceDagDataBuilder {
     }
 
     private Integer findOrCreateNode(String peers) {
-        if (nodeIdMap.containsKey(peers)) {
+        if (nodeIdMap.containsKey(peers) && !peers.equals(Const.USER_CODE)) {
             return nodeIdMap.get(peers);
         } else {
             nodeId++;
diff --git a/apm-collector/apm-collector-worker/src/main/resources/collector.config b/apm-collector/apm-collector-worker/src/main/resources/collector.config
index d7433d244..c007f3ef7 100644
--- a/apm-collector/apm-collector-worker/src/main/resources/collector.config
+++ b/apm-collector/apm-collector-worker/src/main/resources/collector.config
@@ -27,7 +27,7 @@ es.cluster.nodes=127.0.0.1:9300
 #auto: create index when it doesn't exist.
 # forced: delete and create.
 # manual: do nothing.
-es.index.initialize.mode=forced
+es.index.initialize.mode=auto
 # Config of shards or replicas in Elasticsearch.
 es.index.shards.number=2
 es.index.replicas.number=0