diff --git a/src/client/WFKafkaClient.cc b/src/client/WFKafkaClient.cc
index 8506d3ac..9c897db2 100644
--- a/src/client/WFKafkaClient.cc
+++ b/src/client/WFKafkaClient.cc
@@ -28,8 +28,9 @@
 #include <atomic>
 #include <mutex>
 #include "WFTaskError.h"
-#include "WFKafkaClient.h"
 #include "StringUtil.h"
+#include "KafkaTaskImpl.inl"
+#include "WFKafkaClient.h"
 
 #define KAFKA_HEARTBEAT_INTERVAL	(3 * 1000 * 1000)
 
diff --git a/src/client/WFKafkaClient.h b/src/client/WFKafkaClient.h
index 93d27e49..460a95a9 100644
--- a/src/client/WFKafkaClient.h
+++ b/src/client/WFKafkaClient.h
@@ -23,10 +23,9 @@
 #include <string>
 #include <vector>
 #include <functional>
+#include "WFTask.h"
 #include "KafkaMessage.h"
 #include "KafkaResult.h"
-#include "KafkaTaskImpl.inl"
-
 
 class WFKafkaTask;
 class WFKafkaClient;
diff --git a/src/protocol/KafkaDataTypes.cc b/src/protocol/KafkaDataTypes.cc
index f0e25b7a..870366bb 100644
--- a/src/protocol/KafkaDataTypes.cc
+++ b/src/protocol/KafkaDataTypes.cc
@@ -16,21 +16,50 @@
   Authors: Wang Zhulei (wangzhulei@sogou-inc.com)
 */
 
-
 #include <errno.h>
 #include <assert.h>
+#include <algorithm>
 #include "KafkaDataTypes.h"
 
+#define MIN(x, y)	((x) <= (y) ? (x) : (y))
+
 namespace protocol
 {
 
-#define MIN(x, y)	((x) <= (y) ? (x) : (y))
-
-static int compare_member(const void *p1, const void *p2)
+std::string KafkaConfig::get_sasl_info() const
 {
-	kafka_member_t *member1 = (kafka_member_t *)p1;
-	kafka_member_t *member2 = (kafka_member_t *)p2;
-	return strcmp(member1->member_id, member2->member_id);
+	std::string info;
+
+	if (strcasecmp(this->ptr->mechanisms, "plain") == 0)
+	{
+		info += this->ptr->mechanisms;
+		info += "|";
+		info += this->ptr->username;
+		info += "|";
+		info += this->ptr->password;
+		info += "|";
+	}
+	else if (strncasecmp(this->ptr->mechanisms, "SCRAM", 5) == 0)
+	{
+		info += this->ptr->mechanisms;
+		info += "|";
+		info += this->ptr->username;
+		info += "|";
+		info += this->ptr->password;
+		info += "|";
+	}
+
+	return info;
+}
+
+static bool compare_member(const kafka_member_t *m1, const kafka_member_t *m2)
+{
+	return strcmp(m1->member_id, m2->member_id) < 0;
+}
+
+inline void KafkaMetaSubscriber::sort_by_member()
+{
+	std::sort(this->member_vec.begin(), this->member_vec.end(), compare_member);
 }
 
 static bool operator<(const KafkaMetaSubscriber& s1, const KafkaMetaSubscriber& s2)
@@ -114,7 +143,7 @@ int KafkaCgroup::kafka_roundrobin_assignor(kafka_member_t **members,
 	int next = -1;
 
 	std::sort(subscribers->begin(), subscribers->end());
-	qsort(members, member_elements, sizeof (kafka_member_t *), compare_member);
+	std::sort(members, members + member_elements, compare_member);
 
 	for (const auto& subscriber : *subscribers)
 	{
diff --git a/src/protocol/KafkaDataTypes.h b/src/protocol/KafkaDataTypes.h
index 2c0d9329..325b332b 100644
--- a/src/protocol/KafkaDataTypes.h
+++ b/src/protocol/KafkaDataTypes.h
@@ -19,15 +19,14 @@
 #ifndef _KAFKA_DATATYPES_H_
 #define _KAFKA_DATATYPES_H_
 
-
 #include <assert.h>
-#include <algorithm>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <utility>
+#include <string.h>
 #include <vector>
 #include <string>
-#include <string.h>
 #include <atomic>
 #include <snappy.h>
 #include <snappy-sinksource.h>
@@ -35,7 +34,6 @@
 #include "rbtree.h"
 #include "kafka_parser.h"
 
-
 namespace protocol
 {
 
@@ -553,30 +551,7 @@ public:
 		return kafka_sasl_set_password(password, this->ptr) == 0;
 	}
 
-	std::string get_sasl_info() const
-	{
-		std::string info;
-		if (strcasecmp(this->ptr->mechanisms, "plain") == 0)
-		{
-			info += this->ptr->mechanisms;
-			info += "|";
-			info += this->ptr->username;
-			info += "|";
-			info += this->ptr->password;
-			info += "|";
-		}
-		else if (strncasecmp(this->ptr->mechanisms, "SCRAM", 5) == 0)
-		{
-			info += this->ptr->mechanisms;
-			info += "|";
-			info += this->ptr->username;
-			info += "|";
-			info += this->ptr->password;
-			info += "|";
-		}
-
-		return info;
-	}
+	std::string get_sasl_info() const;
 
 	bool new_client(kafka_sasl_t *sasl)
 	{
@@ -1284,15 +1259,7 @@ public:
 		return &this->member_vec;
 	}
 
-	static bool cmp(const kafka_member_t *m1, const kafka_member_t *m2)
-	{
-		return strcmp(m1->member_id, m2->member_id) < 0;
-	}
-
-	void sort_by_member()
-	{
-		std::sort(this->member_vec.begin(), this->member_vec.end(), cmp);
-	}
+	void sort_by_member();
 
 private:
 	KafkaMeta *meta;
diff --git a/src/protocol/kafka_parser.c b/src/protocol/kafka_parser.c
index 3822baeb..b05c070f 100644
--- a/src/protocol/kafka_parser.c
+++ b/src/protocol/kafka_parser.c
@@ -16,14 +16,14 @@
   Authors: Wang Zhulei (wangzhulei@sogou-inc.com)
 */
 
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
 #include <openssl/sha.h>
 #include <openssl/hmac.h>
 #include <openssl/evp.h>
-#include <arpa/inet.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <ctype.h>
 #include "kafka_parser.h"
 
 static kafka_api_version_t kafka_api_version_queryable[] = {
@@ -610,13 +610,13 @@ int kafka_parser_append_message(const void *buf, size_t *size,
 
 	if (s > parser->message_size - parser->cur_size)
 	{
-		memcpy(parser->msgbuf + parser->cur_size, buf,
+		memcpy((char *)parser->msgbuf + parser->cur_size, buf,
 			   parser->message_size - parser->cur_size);
 		parser->cur_size = parser->message_size;
 	}
 	else
 	{
-		memcpy(parser->msgbuf + parser->cur_size, buf, s);
+		memcpy((char *)parser->msgbuf + parser->cur_size, buf, s);
 		parser->cur_size += s;
 	}