diff --git a/skywalking-storage-center/skywalking-routing/src/main/java/com/a/eye/skywalking/routing/disruptor/ack/AckSpanClearEventHandler.java b/skywalking-storage-center/skywalking-routing/src/main/java/com/a/eye/skywalking/routing/disruptor/ack/AckSpanClearEventHandler.java
new file mode 100644
index 000000000..4729e0ed5
--- /dev/null
+++ b/skywalking-storage-center/skywalking-routing/src/main/java/com/a/eye/skywalking/routing/disruptor/ack/AckSpanClearEventHandler.java
@@ -0,0 +1,14 @@
+package com.a.eye.skywalking.routing.disruptor.ack;
+
+import com.lmax.disruptor.EventHandler;
+
+/**
+ * Created by xin on 2017/2/8.
+ */
+public class AckSpanClearEventHandler implements EventHandler<AckSpanHolder> {
+
+    @Override
+    public void onEvent(AckSpanHolder event, long sequence, boolean endOfBatch) throws Exception {
+        event.setAckSpan(null);
+    }
+}
diff --git a/skywalking-storage-center/skywalking-routing/src/main/java/com/a/eye/skywalking/routing/disruptor/ack/AckSpanDisruptor.java b/skywalking-storage-center/skywalking-routing/src/main/java/com/a/eye/skywalking/routing/disruptor/ack/AckSpanDisruptor.java
index ac70cb0e8..3d2e0d65e 100644
--- a/skywalking-storage-center/skywalking-routing/src/main/java/com/a/eye/skywalking/routing/disruptor/ack/AckSpanDisruptor.java
+++ b/skywalking-storage-center/skywalking-routing/src/main/java/com/a/eye/skywalking/routing/disruptor/ack/AckSpanDisruptor.java
@@ -26,7 +26,7 @@ public class AckSpanDisruptor extends AbstractSpanDisruptor {
     public AckSpanDisruptor(String connectionURL) {
         ackSpanDisruptor = new Disruptor<AckSpanHolder>(new AckSpanFactory(), Config.Disruptor.BUFFER_SIZE, DaemonThreadFactory.INSTANCE);
         ackSpanEventHandler = new RouteAckSpanBufferEventHandler(connectionURL);
-        ackSpanDisruptor.handleEventsWith(ackSpanEventHandler, new SpanAlarmHandler());
+        ackSpanDisruptor.handleEventsWith(ackSpanEventHandler).then(new SpanAlarmHandler()).then(new AckSpanClearEventHandler());
         ackSpanDisruptor.start();
         ackSpanRingBuffer = ackSpanDisruptor.getRingBuffer();
     }
diff --git a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/AckSpanDataHolder.java b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/AckSpanDataHolder.java
new file mode 100644
index 000000000..fd8adcc6a
--- /dev/null
+++ b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/AckSpanDataHolder.java
@@ -0,0 +1,23 @@
+package com.a.eye.skywalking.storage.disruptor.ack;
+
+import com.a.eye.skywalking.network.grpc.AckSpan;
+import com.a.eye.skywalking.storage.data.spandata.AckSpanData;
+
+/**
+ * @author zhangxin
+ */
+public class AckSpanDataHolder {
+    private AckSpanData ackSpanData;
+
+    public AckSpanData getAckSpanData() {
+        return ackSpanData;
+    }
+
+    public void clearData() {
+        this.ackSpanData = null;
+    }
+
+    public void fillData(AckSpan ackSpan) {
+        this.ackSpanData = new AckSpanData(ackSpan);
+    }
+}
diff --git a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/AckSpanFactory.java b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/AckSpanFactory.java
index 5bcebd928..4ac5d6d0d 100644
--- a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/AckSpanFactory.java
+++ b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/AckSpanFactory.java
@@ -6,9 +6,9 @@ import com.lmax.disruptor.EventFactory;
 /**
  * Created by wusheng on 2016/11/24.
  */
-public class AckSpanFactory implements EventFactory<AckSpanData> {
+public class AckSpanFactory implements EventFactory<AckSpanDataHolder> {
     @Override
-    public AckSpanData newInstance() {
-        return new AckSpanData();
+    public AckSpanDataHolder newInstance() {
+        return new AckSpanDataHolder();
     }
 }
diff --git a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/StoreAckSpanEventHandler.java b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/StoreAckSpanEventHandler.java
index fa1916539..e8bddefcd 100644
--- a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/StoreAckSpanEventHandler.java
+++ b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/ack/StoreAckSpanEventHandler.java
@@ -11,6 +11,7 @@ import com.a.eye.skywalking.storage.data.index.IndexOperator;
 import com.a.eye.skywalking.storage.data.index.IndexOperatorFactory;
 import com.a.eye.skywalking.storage.data.spandata.AckSpanData;
 import com.a.eye.skywalking.storage.data.spandata.SpanData;
+import com.a.eye.skywalking.storage.disruptor.request.RequestSpanDataHolder;
 import com.lmax.disruptor.EventHandler;
 
 import java.util.ArrayList;
@@ -19,7 +20,7 @@ import java.util.List;
 /**
  * Created by wusheng on 2016/11/24.
  */
-public class StoreAckSpanEventHandler implements EventHandler<AckSpanData> {
+public class StoreAckSpanEventHandler implements EventHandler<AckSpanDataHolder> {
     private static ILog logger = LogManager.getLogger(StoreAckSpanEventHandler.class);
     private DataFileWriter fileWriter;
     private IndexOperator operator;
@@ -34,21 +35,25 @@ public class StoreAckSpanEventHandler implements EventHandler<AckSpanData> {
     }
 
     @Override
-    public void onEvent(AckSpanData event, long sequence, boolean endOfBatch) throws Exception {
-        buffer.add(event);
+    public void onEvent(AckSpanDataHolder event, long sequence, boolean endOfBatch) throws Exception {
+        try {
+            buffer.add(event.getAckSpanData());
 
-        if (endOfBatch || buffer.size() == bufferSize) {
-            try {
-                IndexMetaCollection collection = fileWriter.write(buffer);
+            if (endOfBatch || buffer.size() == bufferSize) {
+                try {
+                    IndexMetaCollection collection = fileWriter.write(buffer);
 
-                operator.batchUpdate(collection);
-                HealthCollector.getCurrentHeathReading("StoreAckSpanEventHandler").updateData(HeathReading.INFO, "Batch consume %s messages successfully.", buffer.size());
-            } catch (Throwable e) {
-                logger.error("Ack messages consume failure.", e);
-                HealthCollector.getCurrentHeathReading("StoreAckSpanEventHandler").updateData(HeathReading.ERROR, "Batch consume %s messages failure.", buffer.size());
-            } finally {
-                buffer.clear();
+                    operator.batchUpdate(collection);
+                    HealthCollector.getCurrentHeathReading("StoreAckSpanEventHandler").updateData(HeathReading.INFO, "Batch consume %s messages successfully.", buffer.size());
+                } catch (Throwable e) {
+                    logger.error("Ack messages consume failure.", e);
+                    HealthCollector.getCurrentHeathReading("StoreAckSpanEventHandler").updateData(HeathReading.ERROR, "Batch consume %s messages failure.", buffer.size());
+                } finally {
+                    buffer.clear();
+                }
             }
+        } finally {
+            event.clearData();
         }
     }
 }
diff --git a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/RequestSpanDataHolder.java b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/RequestSpanDataHolder.java
new file mode 100644
index 000000000..a4ea38da8
--- /dev/null
+++ b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/RequestSpanDataHolder.java
@@ -0,0 +1,25 @@
+package com.a.eye.skywalking.storage.disruptor.request;
+
+import com.a.eye.skywalking.network.grpc.RequestSpan;
+import com.a.eye.skywalking.storage.data.spandata.RequestSpanData;
+
+/**
+ * @author zhangxin
+ */
+public class RequestSpanDataHolder {
+
+    private RequestSpanData requestSpanData;
+
+    public void clearData() {
+        this.requestSpanData = null;
+    }
+
+    public RequestSpanData getRequestSpanData() {
+        return requestSpanData;
+    }
+
+
+    public void fillData(RequestSpan requestSpan) {
+        requestSpanData = new RequestSpanData(requestSpan);
+    }
+}
diff --git a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/RequestSpanFactory.java b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/RequestSpanFactory.java
index 312ccf613..170007da7 100644
--- a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/RequestSpanFactory.java
+++ b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/RequestSpanFactory.java
@@ -6,9 +6,9 @@ import com.lmax.disruptor.EventFactory;
 /**
  * Created by wusheng on 2016/11/24.
  */
-public class RequestSpanFactory implements EventFactory<RequestSpanData> {
+public class RequestSpanFactory implements EventFactory<RequestSpanDataHolder> {
     @Override
-    public RequestSpanData newInstance() {
-        return new RequestSpanData();
+    public RequestSpanDataHolder newInstance() {
+        return new RequestSpanDataHolder();
     }
 }
diff --git a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/StoreRequestSpanEventHandler.java b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/StoreRequestSpanEventHandler.java
index d472ca701..3e57d0841 100644
--- a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/StoreRequestSpanEventHandler.java
+++ b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/disruptor/request/StoreRequestSpanEventHandler.java
@@ -19,7 +19,7 @@ import java.util.List;
 /**
  * Created by wusheng on 2016/11/24.
  */
-public class StoreRequestSpanEventHandler implements EventHandler<RequestSpanData> {
+public class StoreRequestSpanEventHandler implements EventHandler<RequestSpanDataHolder> {
     private static ILog logger = LogManager.getLogger(StoreRequestSpanEventHandler.class);
     private DataFileWriter fileWriter;
     private IndexOperator operator;
@@ -34,23 +34,26 @@ public class StoreRequestSpanEventHandler implements EventHandler<RequestSpanDat
     }
 
     @Override
-    public void onEvent(RequestSpanData event, long sequence, boolean endOfBatch) throws Exception {
-        buffer.add(event);
+    public void onEvent(RequestSpanDataHolder event, long sequence, boolean endOfBatch) throws Exception {
+        try {
+            buffer.add(event.getRequestSpanData());
 
-        if (endOfBatch || buffer.size() == bufferSize) {
-            try {
-                IndexMetaCollection collection = fileWriter.write(buffer);
+            if (endOfBatch || buffer.size() == bufferSize) {
+                try {
+                    IndexMetaCollection collection = fileWriter.write(buffer);
 
-                operator.batchUpdate(collection);
+                    operator.batchUpdate(collection);
 
-                HealthCollector.getCurrentHeathReading("StoreRequestSpanEventHandler").updateData(HeathReading.INFO, "Batch consume %s messages successfully.", buffer.size());
-            } catch (Throwable e) {
-                logger.error("Ack messages consume failure.", e);
-                HealthCollector.getCurrentHeathReading("StoreRequestSpanEventHandler").updateData(HeathReading.ERROR, "Batch consume %s messages failure.", buffer.size());
-            } finally {
-                buffer.clear();
+                    HealthCollector.getCurrentHeathReading("StoreRequestSpanEventHandler").updateData(HeathReading.INFO, "Batch consume %s messages successfully.", buffer.size());
+                } catch (Throwable e) {
+                    logger.error("Ack messages consume failure.", e);
+                    HealthCollector.getCurrentHeathReading("StoreRequestSpanEventHandler").updateData(HeathReading.ERROR, "Batch consume %s messages failure.", buffer.size());
+                } finally {
+                    buffer.clear();
+                }
             }
+        } finally {
+            event.clearData();
         }
-
     }
 }
diff --git a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/listener/StorageListener.java b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/listener/StorageListener.java
index 6fcd81817..5d9adfbea 100644
--- a/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/listener/StorageListener.java
+++ b/skywalking-storage-center/skywalking-storage/src/main/java/com/a/eye/skywalking/storage/listener/StorageListener.java
@@ -8,10 +8,10 @@ import com.a.eye.skywalking.network.grpc.AckSpan;
 import com.a.eye.skywalking.network.grpc.RequestSpan;
 import com.a.eye.skywalking.network.listener.server.SpanStorageServerListener;
 import com.a.eye.skywalking.storage.config.Config;
-import com.a.eye.skywalking.storage.data.spandata.AckSpanData;
-import com.a.eye.skywalking.storage.data.spandata.RequestSpanData;
+import com.a.eye.skywalking.storage.disruptor.ack.AckSpanDataHolder;
 import com.a.eye.skywalking.storage.disruptor.ack.AckSpanFactory;
 import com.a.eye.skywalking.storage.disruptor.ack.StoreAckSpanEventHandler;
+import com.a.eye.skywalking.storage.disruptor.request.RequestSpanDataHolder;
 import com.a.eye.skywalking.storage.disruptor.request.RequestSpanFactory;
 import com.a.eye.skywalking.storage.disruptor.request.StoreRequestSpanEventHandler;
 import com.lmax.disruptor.RingBuffer;
@@ -22,19 +22,19 @@ public class StorageListener implements SpanStorageServerListener {
 
     private ILog logger = LogManager.getLogger(StorageListener.class);
 
-    private Disruptor<RequestSpanData>  requestSpanDisruptor;
-    private RingBuffer<RequestSpanData> requestSpanRingBuffer;
+    private Disruptor<RequestSpanDataHolder>  requestSpanDisruptor;
+    private RingBuffer<RequestSpanDataHolder> requestSpanRingBuffer;
 
-    private Disruptor<AckSpanData>  ackSpanDisruptor;
-    private RingBuffer<AckSpanData> ackSpanRingBuffer;
+    private Disruptor<AckSpanDataHolder>  ackSpanDisruptor;
+    private RingBuffer<AckSpanDataHolder> ackSpanRingBuffer;
 
     public StorageListener() {
-        requestSpanDisruptor = new Disruptor<RequestSpanData>(new RequestSpanFactory(), Config.Disruptor.BUFFER_SIZE, DaemonThreadFactory.INSTANCE);
+        requestSpanDisruptor = new Disruptor<RequestSpanDataHolder>(new RequestSpanFactory(), Config.Disruptor.BUFFER_SIZE, DaemonThreadFactory.INSTANCE);
         requestSpanDisruptor.handleEventsWith(new StoreRequestSpanEventHandler());
         requestSpanDisruptor.start();
         requestSpanRingBuffer = requestSpanDisruptor.getRingBuffer();
 
-        ackSpanDisruptor = new Disruptor<AckSpanData>(new AckSpanFactory(), Config.Disruptor.BUFFER_SIZE, DaemonThreadFactory.INSTANCE);
+        ackSpanDisruptor = new Disruptor<AckSpanDataHolder>(new AckSpanFactory(), Config.Disruptor.BUFFER_SIZE, DaemonThreadFactory.INSTANCE);
         ackSpanDisruptor.handleEventsWith(new StoreAckSpanEventHandler());
         ackSpanDisruptor.start();
         ackSpanRingBuffer = ackSpanDisruptor.getRingBuffer();
@@ -44,8 +44,8 @@ public class StorageListener implements SpanStorageServerListener {
     public boolean storage(RequestSpan requestSpan) {
         long sequence = requestSpanRingBuffer.next();  // Grab the next sequence
         try {
-            RequestSpanData data = requestSpanRingBuffer.get(sequence);
-            data.setRequestSpan(requestSpan);
+            RequestSpanDataHolder data = requestSpanRingBuffer.get(sequence);
+            data.fillData(requestSpan);
 
             HealthCollector.getCurrentHeathReading("StorageListener").updateData(HeathReading.INFO, "RequestSpan stored.");
             return true;
@@ -62,8 +62,8 @@ public class StorageListener implements SpanStorageServerListener {
     public boolean storage(AckSpan ackSpan) {
         long sequence = ackSpanRingBuffer.next();  // Grab the next sequence
         try {
-            AckSpanData data = ackSpanRingBuffer.get(sequence);
-            data.setAckSpan(ackSpan);
+            AckSpanDataHolder data = ackSpanRingBuffer.get(sequence);
+            data.fillData(ackSpan);
 
             HealthCollector.getCurrentHeathReading("StorageListener").updateData(HeathReading.INFO, "AckSpan stored.");
             return true;