diff --git a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/node/persistence/NodeMappingDaySave.java b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/node/persistence/NodeMappingDaySave.java
index 463b7f190..c54393183 100644
--- a/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/node/persistence/NodeMappingDaySave.java
+++ b/skywalking-collector/skywalking-collector-worker/src/main/java/com/a/eye/skywalking/collector/worker/node/persistence/NodeMappingDaySave.java
@@ -7,7 +7,6 @@ import com.a.eye.skywalking.collector.actor.selector.HashCodeSelector;
 import com.a.eye.skywalking.collector.actor.selector.WorkerSelector;
 import com.a.eye.skywalking.collector.worker.RecordPersistenceMember;
 import com.a.eye.skywalking.collector.worker.WorkerConfig;
-import com.a.eye.skywalking.collector.worker.node.NodeIndex;
 import com.a.eye.skywalking.collector.worker.node.NodeMappingIndex;
 
 /**