diff --git a/dubbo-remoting/dubbo-remoting-api/src/main/java/com/alibaba/dubbo/remoting/exchange/codec/ExchangeCodec.java b/dubbo-remoting/dubbo-remoting-api/src/main/java/com/alibaba/dubbo/remoting/exchange/codec/ExchangeCodec.java
index 62e80d51f26f8a4dab85dadef00bd83a93840092..32646f3dc302ed7eab4c380e7af80ce631a4dd2a 100644
--- a/dubbo-remoting/dubbo-remoting-api/src/main/java/com/alibaba/dubbo/remoting/exchange/codec/ExchangeCodec.java
+++ b/dubbo-remoting/dubbo-remoting-api/src/main/java/com/alibaba/dubbo/remoting/exchange/codec/ExchangeCodec.java
@@ -124,69 +124,8 @@ public class ExchangeCodec extends TelnetCodec {
         if( readable != tt )
             is = StreamUtils.limitedInputStream(is, len);
 
-        return decodeBody(channel, is, header);
-    }
-
-    protected Object decodeBody(Channel channel, InputStream is, byte[] header) throws IOException {
         try {
-	        byte flag = header[2], proto = (byte)( flag & SERIALIZATION_MASK );
-	        Serialization s = CodecSupport.getSerialization(channel.getUrl(), proto);
-	        ObjectInput in = s.deserialize(channel.getUrl(), is);
-	        // get request id.
-	        long id = Bytes.bytes2long(header, 4);
-	        if( ( flag & FLAG_REQUEST ) == 0 ) {
-	            // decode response.
-	            Response res = new Response(id);
-	            if (( flag & FLAG_EVENT ) != 0){
-	                res.setEvent(Response.HEARTBEAT_EVENT);
-	            }
-	            // get status.
-	            byte status = header[3];
-	            res.setStatus(status);
-	            if( status == Response.OK ) {
-	                try {
-	                    Object data;
-	                    if (res.isHeartbeat()) {
-	                        data = decodeHeartbeatData(channel, in);
-	                    } else if (res.isEvent()) {
-	                        data = decodeEventData(channel, in);
-	                    } else {
-	                        data = decodeResponseData(channel, in, getRequestData(id));
-	                    }
-	                    res.setResult(data);
-	                } catch (Throwable t) {
-	                    res.setStatus(Response.CLIENT_ERROR);
-	                    res.setErrorMessage(StringUtils.toString(t));
-	                }
-	            } else {
-	                res.setErrorMessage(in.readUTF());
-	            }
-	            return res;
-	        } else {
-	            // decode request.
-	            Request req = new Request(id);
-	            req.setVersion("2.0.0");
-	            req.setTwoWay( ( flag & FLAG_TWOWAY ) != 0 );
-	            if (( flag & FLAG_EVENT ) != 0 ){
-	                req.setEvent(Request.HEARTBEAT_EVENT);
-	            }
-	            try {
-	                Object data;
-	                if (req.isHeartbeat()) {
-	                    data = decodeHeartbeatData(channel, in);
-	                } else if (req.isEvent()) {
-	                    data = decodeEventData(channel, in);
-	                } else {
-	                    data = decodeRequestData(channel, in);
-	                }
-	                req.setData(data);
-	            } catch (Throwable t) {
-	                // bad request
-	                req.setBroken(true);
-	                req.setData(t);
-	            }
-	            return req;
-	        }
+            return decodeBody(channel, is, header);
         } finally {
             if (is.available() > 0) {
                 try {
@@ -201,6 +140,67 @@ public class ExchangeCodec extends TelnetCodec {
         }
     }
 
+    protected Object decodeBody(Channel channel, InputStream is, byte[] header) throws IOException {
+        byte flag = header[2], proto = (byte) (flag & SERIALIZATION_MASK);
+        Serialization s = CodecSupport.getSerialization(channel.getUrl(), proto);
+        ObjectInput in = s.deserialize(channel.getUrl(), is);
+        // get request id.
+        long id = Bytes.bytes2long(header, 4);
+        if ((flag & FLAG_REQUEST) == 0) {
+            // decode response.
+            Response res = new Response(id);
+            if ((flag & FLAG_EVENT) != 0) {
+                res.setEvent(Response.HEARTBEAT_EVENT);
+            }
+            // get status.
+            byte status = header[3];
+            res.setStatus(status);
+            if (status == Response.OK) {
+                try {
+                    Object data;
+                    if (res.isHeartbeat()) {
+                        data = decodeHeartbeatData(channel, in);
+                    } else if (res.isEvent()) {
+                        data = decodeEventData(channel, in);
+                    } else {
+                        data = decodeResponseData(channel, in, getRequestData(id));
+                    }
+                    res.setResult(data);
+                } catch (Throwable t) {
+                    res.setStatus(Response.CLIENT_ERROR);
+                    res.setErrorMessage(StringUtils.toString(t));
+                }
+            } else {
+                res.setErrorMessage(in.readUTF());
+            }
+            return res;
+        } else {
+            // decode request.
+            Request req = new Request(id);
+            req.setVersion("2.0.0");
+            req.setTwoWay((flag & FLAG_TWOWAY) != 0);
+            if ((flag & FLAG_EVENT) != 0) {
+                req.setEvent(Request.HEARTBEAT_EVENT);
+            }
+            try {
+                Object data;
+                if (req.isHeartbeat()) {
+                    data = decodeHeartbeatData(channel, in);
+                } else if (req.isEvent()) {
+                    data = decodeEventData(channel, in);
+                } else {
+                    data = decodeRequestData(channel, in);
+                }
+                req.setData(data);
+            } catch (Throwable t) {
+                // bad request
+                req.setBroken(true);
+                req.setData(t);
+            }
+            return req;
+        }
+    }
+
     protected Object getRequestData(long id) {
         DefaultFuture future = DefaultFuture.getFuture(id);
         if (future == null)
diff --git a/dubbo-rpc/dubbo-rpc-default/src/main/java/com/alibaba/dubbo/rpc/protocol/dubbo/DubboCodec.java b/dubbo-rpc/dubbo-rpc-default/src/main/java/com/alibaba/dubbo/rpc/protocol/dubbo/DubboCodec.java
index 3641377c85a58f6790fb97e4e79a068b61da4b22..6a003d3c1c62b60bc947fc87d8c352cfc5efc1c5 100644
--- a/dubbo-rpc/dubbo-rpc-default/src/main/java/com/alibaba/dubbo/rpc/protocol/dubbo/DubboCodec.java
+++ b/dubbo-rpc/dubbo-rpc-default/src/main/java/com/alibaba/dubbo/rpc/protocol/dubbo/DubboCodec.java
@@ -88,12 +88,17 @@ public class DubboCodec extends ExchangeCodec implements Codec {
                     } else if (res.isEvent()) {
                         data = decodeEventData(channel, deserialize(s, channel.getUrl(), is));
                     } else {
-                        DecodeableRpcResult result = new DecodeableRpcResult(channel, res,
-                            new UnsafeByteArrayInputStream(readMessageData(is)), (Invocation) getRequestData(id), proto);
+                        DecodeableRpcResult result;
                         if (channel.getUrl().getParameter(
                             Constants.DECODE_IN_IO_THREAD_KEY,
                             Constants.DEFAULT_DECODE_IN_IO_THREAD)) {
+                            result = new DecodeableRpcResult(channel, res, is,
+                                                             (Invocation)getRequestData(id), proto);
                             result.decode();
+                        } else {
+                            result = new DecodeableRpcResult(channel, res,
+                                                             new UnsafeByteArrayInputStream(readMessageData(is)),
+                                                             (Invocation) getRequestData(id), proto);
                         }
                         data = result;
                     }
@@ -124,12 +129,15 @@ public class DubboCodec extends ExchangeCodec implements Codec {
                 } else if (req.isEvent()) {
                     data = decodeEventData(channel, deserialize(s, channel.getUrl(), is));
                 } else {
-                    DecodeableRpcInvocation inv = new DecodeableRpcInvocation(channel, req,
-                        new UnsafeByteArrayInputStream(readMessageData(is)), proto);
+                    DecodeableRpcInvocation inv;
                     if (channel.getUrl().getParameter(
                         Constants.DECODE_IN_IO_THREAD_KEY,
                         Constants.DEFAULT_DECODE_IN_IO_THREAD)) {
+                        inv = new DecodeableRpcInvocation(channel, req, is, proto);
                         inv.decode();
+                    } else {
+                        inv = new DecodeableRpcInvocation(channel, req,
+                                                          new UnsafeByteArrayInputStream(readMessageData(is)), proto);
                     }
                     data = inv;
                 }