diff --git a/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSender.java b/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSender.java
index e0a3a455d..0d90345af 100644
--- a/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSender.java
+++ b/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSender.java
@@ -88,7 +88,7 @@ public class DataSender implements IDataSender {
         return false;
     }
 
-    public InetSocketAddress getServerIp() {
+    public InetSocketAddress getServerAddr() {
         return this.socketAddress;
     }
 
diff --git a/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSenderFactoryWithBalance.java b/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSenderFactoryWithBalance.java
index be4e11071..31c6d876d 100644
--- a/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSenderFactoryWithBalance.java
+++ b/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/DataSenderFactoryWithBalance.java
@@ -131,7 +131,7 @@ public class DataSenderFactoryWithBalance {
                         if (tmpDataSender.getStatus() == DataSender.SenderStatus.FAILED) {
                             tmpDataSender.close();
                             unusedServerAddresses.add(tmpDataSender
-                                    .getServerIp());
+                                    .getServerAddr());
                             senderIterator.remove();
                             SDKHealthCollector.getCurrentHeathReading("remove").updateData(HeathReading.INFO, "remove disconnected sender.");
                         }
@@ -175,19 +175,19 @@ public class DataSenderFactoryWithBalance {
                                 }
                                 toBeSwitchSender.close();
                                 unusedServerAddresses.remove(tmpSender
-                                        .getServerIp());
+                                        .getServerAddr());
                                 unusedServerAddresses.add(toBeSwitchSender
-                                        .getServerIp());
+                                        .getServerAddr());
                                 SDKHealthCollector.getCurrentHeathReading("switch").updateData(HeathReading.INFO, "switch existed sender.");
                             }
                         }
                         sleepTime = 0;
                     }
-                    
-                    SDKHealthCollector.getCurrentHeathReading(null).updateData(HeathReading.INFO, "using available DataSender size:" + usingDataSender);
                 } catch (Throwable e) {
                 	SDKHealthCollector.getCurrentHeathReading(null).updateData(HeathReading.ERROR, "DataSenderChecker running failed:" + e.getMessage());
                     logger.error("DataSenderChecker running failed", e);
+                } finally{
+                	SDKHealthCollector.getCurrentHeathReading(null).updateData(HeathReading.INFO, "using available DataSender connect to: " + listUsingServers());
                 }
 
                 sleepTime += CHECKER_THREAD_WAIT_INTERVAL;
@@ -240,4 +240,17 @@ public class DataSenderFactoryWithBalance {
                     .setStatus(DataSender.SenderStatus.FAILED);
         }
     }
+    
+    private static String listUsingServers(){
+    	StringBuilder usingAddrDesc = new StringBuilder();
+    	if(usingDataSender.size() > 0){
+    		for(DataSender sender : usingDataSender){
+    			if(usingAddrDesc.length() > 0){
+    				usingAddrDesc.append(",");
+    			}
+    			usingAddrDesc.append(sender.getServerAddr().toString());
+    		}
+    	}
+    	return usingAddrDesc.toString();
+    }
 }
diff --git a/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/protocol/ProtocolBuilder.java b/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/protocol/ProtocolBuilder.java
deleted file mode 100644
index 35ecb78cc..000000000
--- a/skywalking-api/src/main/java/com/ai/cloud/skywalking/sender/protocol/ProtocolBuilder.java
+++ /dev/null
@@ -1,29 +0,0 @@
-package com.ai.cloud.skywalking.sender.protocol;
-
-import com.ai.cloud.skywalking.conf.Config;
-
-import java.nio.charset.Charset;
-
-public class ProtocolBuilder {
-
-    //协议格式:
-    // xx xx xx xx | xx xx xx xx xxx xxx xxx
-    //   header(4) |        content
-    public static byte[] builder(String data) {
-        byte[] content = data.getBytes(Charset.forName(Config.SkyWalking.CHARSET));
-        byte[] header = intToByteArray(content.length);
-        byte[] des = new byte[header.length + content.length];
-        System.arraycopy(header, 0, des, 0, header.length);
-        System.arraycopy(content, 0, des, header.length, content.length);
-        return des;
-    }
-
-    private static byte[] intToByteArray(final int value) {
-        byte[] src = new byte[4];
-        src[0] = (byte) ((value >> 24) & 0xFF);
-        src[1] = (byte) ((value >> 16) & 0xFF);
-        src[2] = (byte) ((value >> 8) & 0xFF);
-        src[3] = (byte) (value & 0xFF);
-        return src;
-    }
-}