diff --git a/skywalking-collector/skywalking-collector-cluster/src/main/java/com/a/eye/skywalking/collector/actor/selector/RollingSelector.java b/skywalking-collector/skywalking-collector-cluster/src/main/java/com/a/eye/skywalking/collector/actor/selector/RollingSelector.java
index 8ef322c6b..0de97621f 100644
--- a/skywalking-collector/skywalking-collector-cluster/src/main/java/com/a/eye/skywalking/collector/actor/selector/RollingSelector.java
+++ b/skywalking-collector/skywalking-collector-cluster/src/main/java/com/a/eye/skywalking/collector/actor/selector/RollingSelector.java
@@ -11,7 +11,7 @@ import java.util.List;
  *
  * @author wusheng
  */
-public enum RollingSelector implements WorkerSelector<Object> {
+public enum RollingSelector implements WorkerSelector {
     INSTANCE;
 
     /**
diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/applicationref/ApplicationRefMember.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/applicationref/ApplicationRefMember.java
index 28d746aea..ec33bceae 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/applicationref/ApplicationRefMember.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/applicationref/ApplicationRefMember.java
@@ -2,6 +2,7 @@ package com.a.eye.skywalking.collector.worker.applicationref;
 
 import akka.actor.ActorRef;
 import com.a.eye.skywalking.collector.actor.AbstractMember;
+import com.a.eye.skywalking.collector.actor.AbstractSyncMember;
 import com.a.eye.skywalking.collector.actor.AbstractSyncMemberProvider;
 import com.a.eye.skywalking.collector.actor.selector.RollingSelector;
 import com.a.eye.skywalking.collector.worker.applicationref.presistence.DAGNodeRefPersistence;
@@ -10,7 +11,7 @@ import com.a.eye.skywalking.trace.TraceSegment;
 /**
  * @author pengys5
  */
-public class ApplicationRefMember extends AbstractMember {
+public class ApplicationRefMember extends AbstractSyncMember {
 
     public ApplicationRefMember(ActorRef actorRef) throws Throwable {
         super(actorRef);