diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index 4cd36acefa97e64556082c3df3a137b8eb880f6f..035a767b87fd3e91bfa7d83e473db167c68b0d6f 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -917,6 +917,9 @@ typedef struct {
   SReplica replicas[TSDB_MAX_REPLICA];
 } SDCreateMnodeReq, SDAlterMnodeReq;
 
+int32_t tSerializeSDCreateMnodeReq(void* buf, int32_t bufLen, SDCreateMnodeReq* pReq);
+int32_t tDeserializeSDCreateMnodeReq(void* buf, int32_t bufLen, SDCreateMnodeReq* pReq);
+
 typedef struct {
   int32_t dnodeId;
 } SMCreateQnodeReq, SMDropQnodeReq, SDCreateQnodeReq, SDDropQnodeReq, SMCreateSnodeReq, SMDropSnodeReq,
@@ -982,9 +985,11 @@ typedef struct {
   char ckey[TSDB_PASSWORD_LEN];
 } SAuthReq, SAuthRsp;
 
+int32_t tSerializeSAuthReq(void* buf, int32_t bufLen, SAuthReq* pReq);
+int32_t tDeserializeSAuthReq(void* buf, int32_t bufLen, SAuthReq* pReq);
+
 typedef struct {
   int8_t finished;
-  int8_t align[7];
   char   name[TSDB_STEP_NAME_LEN];
   char   desc[TSDB_STEP_DESC_LEN];
 } SStartupReq;
diff --git a/source/common/src/tmsg.c b/source/common/src/tmsg.c
index 7b9682df1421d723f1e31fb7613057aeb2261039..611416499f8d5f07f4790c1f28e772015c9054d6 100644
--- a/source/common/src/tmsg.c
+++ b/source/common/src/tmsg.c
@@ -2020,6 +2020,20 @@ int32_t tDeserializeSMTimerMsg(void *buf, int32_t bufLen, SMTimerReq *pReq) {
   return 0;
 }
 
+int32_t tEncodeSReplica(SCoder *pEncoder, SReplica *pReplica) {
+  if (tEncodeI32(pEncoder, pReplica->id) < 0) return -1;
+  if (tEncodeU16(pEncoder, pReplica->port) < 0) return -1;
+  if (tEncodeCStr(pEncoder, pReplica->fqdn) < 0) return -1;
+  return 0;
+}
+
+int32_t tDecodeSReplica(SCoder *pDecoder, SReplica *pReplica) {
+  if (tDecodeI32(pDecoder, &pReplica->id) < 0) return -1;
+  if (tDecodeU16(pDecoder, &pReplica->port) < 0) return -1;
+  if (tDecodeCStrTo(pDecoder, pReplica->fqdn) < 0) return -1;
+  return 0;
+}
+
 int32_t tSerializeSCreateVnodeReq(void *buf, int32_t bufLen, SCreateVnodeReq *pReq) {
   SCoder encoder = {0};
   tCoderInit(&encoder, TD_LITTLE_ENDIAN, buf, bufLen, TD_ENCODER);
@@ -2050,9 +2064,7 @@ int32_t tSerializeSCreateVnodeReq(void *buf, int32_t bufLen, SCreateVnodeReq *pR
   if (tEncodeI8(&encoder, pReq->selfIndex) < 0) return -1;
   for (int32_t i = 0; i < TSDB_MAX_REPLICA; ++i) {
     SReplica *pReplica = &pReq->replicas[i];
-    if (tEncodeI32(&encoder, pReplica->id) < 0) return -1;
-    if (tEncodeU16(&encoder, pReplica->port) < 0) return -1;
-    if (tEncodeCStr(&encoder, pReplica->fqdn) < 0) return -1;
+    if (tEncodeSReplica(&encoder, pReplica) < 0) return -1;
   }
   tEndEncode(&encoder);
 
@@ -2091,9 +2103,7 @@ int32_t tDeserializeSCreateVnodeReq(void *buf, int32_t bufLen, SCreateVnodeReq *
   if (tDecodeI8(&decoder, &pReq->selfIndex) < 0) return -1;
   for (int32_t i = 0; i < TSDB_MAX_REPLICA; ++i) {
     SReplica *pReplica = &pReq->replicas[i];
-    if (tDecodeI32(&decoder, &pReplica->id) < 0) return -1;
-    if (tDecodeU16(&decoder, &pReplica->port) < 0) return -1;
-    if (tDecodeCStrTo(&decoder, pReplica->fqdn) < 0) return -1;
+    if (tDecodeSReplica(&decoder, pReplica) < 0) return -1;
   }
 
   tEndDecode(&decoder);
@@ -2182,4 +2192,72 @@ int32_t tDeserializeSKillConnReq(void *buf, int32_t bufLen, SKillConnReq *pReq)
 
   tCoderClear(&decoder);
   return 0;
-}
\ No newline at end of file
+}
+
+int32_t tSerializeSDCreateMnodeReq(void *buf, int32_t bufLen, SDCreateMnodeReq *pReq) {
+  SCoder encoder = {0};
+  tCoderInit(&encoder, TD_LITTLE_ENDIAN, buf, bufLen, TD_ENCODER);
+
+  if (tStartEncode(&encoder) < 0) return -1;
+  if (tEncodeI32(&encoder, pReq->dnodeId) < 0) return -1;
+  if (tEncodeI8(&encoder, pReq->replica) < 0) return -1;
+  for (int32_t i = 0; i < TSDB_MAX_REPLICA; ++i) {
+    SReplica *pReplica = &pReq->replicas[i];
+    if (tEncodeSReplica(&encoder, pReplica) < 0) return -1;
+  }
+  tEndEncode(&encoder);
+
+  int32_t tlen = encoder.pos;
+  tCoderClear(&encoder);
+  return tlen;
+}
+
+int32_t tDeserializeSDCreateMnodeReq(void *buf, int32_t bufLen, SDCreateMnodeReq *pReq) {
+  SCoder decoder = {0};
+  tCoderInit(&decoder, TD_LITTLE_ENDIAN, buf, bufLen, TD_DECODER);
+
+  if (tStartDecode(&decoder) < 0) return -1;
+  if (tDecodeI32(&decoder, &pReq->dnodeId) < 0) return -1;
+  if (tDecodeI8(&decoder, &pReq->replica) < 0) return -1;
+  for (int32_t i = 0; i < TSDB_MAX_REPLICA; ++i) {
+    SReplica *pReplica = &pReq->replicas[i];
+    if (tDecodeSReplica(&decoder, pReplica) < 0) return -1;
+  }
+  tEndDecode(&decoder);
+
+  tCoderClear(&decoder);
+  return 0;
+}
+
+int32_t tSerializeSAuthReq(void *buf, int32_t bufLen, SAuthReq *pReq) {
+  SCoder encoder = {0};
+  tCoderInit(&encoder, TD_LITTLE_ENDIAN, buf, bufLen, TD_ENCODER);
+
+  if (tStartEncode(&encoder) < 0) return -1;
+  if (tEncodeCStr(&encoder, pReq->user) < 0) return -1;
+  if (tEncodeI8(&encoder, pReq->spi) < 0) return -1;
+  if (tEncodeI8(&encoder, pReq->encrypt) < 0) return -1;
+  if (tEncodeBinary(&encoder, pReq->secret, TSDB_PASSWORD_LEN) < 0) return -1;
+  if (tEncodeBinary(&encoder, pReq->ckey, TSDB_PASSWORD_LEN) < 0) return -1;
+  tEndEncode(&encoder);
+
+  int32_t tlen = encoder.pos;
+  tCoderClear(&encoder);
+  return tlen;
+}
+
+int32_t tDeserializeSAuthReq(void *buf, int32_t bufLen, SAuthReq *pReq) {
+  SCoder decoder = {0};
+  tCoderInit(&decoder, TD_LITTLE_ENDIAN, buf, bufLen, TD_DECODER);
+
+  if (tStartDecode(&decoder) < 0) return -1;
+  if (tDecodeCStrTo(&decoder, pReq->user) < 0) return -1;
+  if (tDecodeI8(&decoder, &pReq->spi) < 0) return -1;
+  if (tDecodeI8(&decoder, &pReq->encrypt) < 0) return -1;
+  if (tDecodeCStrTo(&decoder, pReq->secret) < 0) return -1;
+  if (tDecodeCStrTo(&decoder, pReq->ckey) < 0) return -1;
+  tEndDecode(&decoder);
+
+  tCoderClear(&decoder);
+  return 0;
+}
diff --git a/source/dnode/mgmt/impl/src/dndMnode.c b/source/dnode/mgmt/impl/src/dndMnode.c
index 0874c633bf2f276dd10869752e2b1ce1717f269b..c6db75c0575c3cc932e002c295d5e7e2c5d06e63 100644
--- a/source/dnode/mgmt/impl/src/dndMnode.c
+++ b/source/dnode/mgmt/impl/src/dndMnode.c
@@ -424,28 +424,22 @@ static int32_t dndDropMnode(SDnode *pDnode) {
   return 0;
 }
 
-static SDCreateMnodeReq *dndParseCreateMnodeReq(SRpcMsg *pReq) {
-  SDCreateMnodeReq *pCreate = pReq->pCont;
-  pCreate->dnodeId = htonl(pCreate->dnodeId);
-  for (int32_t i = 0; i < pCreate->replica; ++i) {
-    pCreate->replicas[i].id = htonl(pCreate->replicas[i].id);
-    pCreate->replicas[i].port = htons(pCreate->replicas[i].port);
-  }
-
-  return pCreate;
-}
 
 int32_t dndProcessCreateMnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
-  SDCreateMnodeReq *pCreate = dndParseCreateMnodeReq(pReq);
+  SDCreateMnodeReq createReq = {0};
+  if (tDeserializeSDCreateMnodeReq(pReq->pCont, pReq->contLen, &createReq) != 0) {
+    terrno = TSDB_CODE_INVALID_MSG;
+    return -1;
+  }
 
-  if (pCreate->replica <= 1 || pCreate->dnodeId != dndGetDnodeId(pDnode)) {
+  if (createReq.replica <= 1 || createReq.dnodeId != dndGetDnodeId(pDnode)) {
     terrno = TSDB_CODE_DND_MNODE_INVALID_OPTION;
     dError("failed to create mnode since %s", terrstr());
     return -1;
   }
 
   SMnodeOpt option = {0};
-  if (dndBuildMnodeOptionFromReq(pDnode, &option, pCreate) != 0) {
+  if (dndBuildMnodeOptionFromReq(pDnode, &option, &createReq) != 0) {
     terrno = TSDB_CODE_DND_MNODE_INVALID_OPTION;
     dError("failed to create mnode since %s", terrstr());
     return -1;
@@ -464,16 +458,20 @@ int32_t dndProcessCreateMnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
 }
 
 int32_t dndProcessAlterMnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
-  SDAlterMnodeReq *pAlter = dndParseCreateMnodeReq(pReq);
+  SDAlterMnodeReq alterReq = {0};
+  if (tDeserializeSDCreateMnodeReq(pReq->pCont, pReq->contLen, &alterReq) != 0) {
+    terrno = TSDB_CODE_INVALID_MSG;
+    return -1;
+  }
 
-  if (pAlter->dnodeId != dndGetDnodeId(pDnode)) {
+  if (alterReq.dnodeId != dndGetDnodeId(pDnode)) {
     terrno = TSDB_CODE_DND_MNODE_INVALID_OPTION;
     dError("failed to alter mnode since %s", terrstr());
     return -1;
   }
 
   SMnodeOpt option = {0};
-  if (dndBuildMnodeOptionFromReq(pDnode, &option, pAlter) != 0) {
+  if (dndBuildMnodeOptionFromReq(pDnode, &option, &alterReq) != 0) {
     terrno = TSDB_CODE_DND_MNODE_INVALID_OPTION;
     dError("failed to alter mnode since %s", terrstr());
     return -1;
@@ -494,10 +492,13 @@ int32_t dndProcessAlterMnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
 }
 
 int32_t dndProcessDropMnodeReq(SDnode *pDnode, SRpcMsg *pReq) {
-  SDDropMnodeReq *pDrop = pReq->pCont;
-  pDrop->dnodeId = htonl(pDrop->dnodeId);
+  SDDropMnodeReq dropReq = {0};
+  if (tDeserializeSMCreateDropMnodeReq(pReq->pCont, pReq->contLen, &dropReq) != 0) {
+    terrno = TSDB_CODE_INVALID_MSG;
+    return -1;
+  }
 
-  if (pDrop->dnodeId != dndGetDnodeId(pDnode)) {
+  if (dropReq.dnodeId != dndGetDnodeId(pDnode)) {
     terrno = TSDB_CODE_DND_MNODE_INVALID_OPTION;
     dError("failed to drop mnode since %s", terrstr());
     return -1;
diff --git a/source/dnode/mgmt/impl/src/dndTransport.c b/source/dnode/mgmt/impl/src/dndTransport.c
index e65e62070e50ad4ba24ce8c7df7d8db22ce80b3e..d2b4b50598e55c8937eba3f5807fed513316fa8f 100644
--- a/source/dnode/mgmt/impl/src/dndTransport.c
+++ b/source/dnode/mgmt/impl/src/dndTransport.c
@@ -308,12 +308,15 @@ static int32_t dndRetrieveUserAuthInfo(void *parent, char *user, char *spi, char
     return -1;
   }
 
-  SAuthReq *pReq = rpcMallocCont(sizeof(SAuthReq));
-  tstrncpy(pReq->user, user, TSDB_USER_LEN);
+  SAuthReq authReq = {0};
+  tstrncpy(authReq.user, user, TSDB_USER_LEN);
+  int32_t contLen = tSerializeSAuthReq(NULL, 0, &authReq);
+  void   *pReq = rpcMallocCont(contLen);
+  tSerializeSAuthReq(pReq, contLen, &authReq);
 
-  SRpcMsg rpcMsg = {.pCont = pReq, .contLen = sizeof(SAuthReq), .msgType = TDMT_MND_AUTH, .ahandle = (void *)9528};
+  SRpcMsg rpcMsg = {.pCont = pReq, .contLen = contLen, .msgType = TDMT_MND_AUTH, .ahandle = (void *)9528};
   SRpcMsg rpcRsp = {0};
-  dTrace("user:%s, send user auth req to other mnodes, spi:%d encrypt:%d", user, pReq->spi, pReq->encrypt);
+  dTrace("user:%s, send user auth req to other mnodes, spi:%d encrypt:%d", user, authReq.spi, authReq.encrypt);
   dndSendMsgToMnodeRecv(pDnode, &rpcMsg, &rpcRsp);
 
   if (rpcRsp.code != 0) {
diff --git a/source/dnode/mgmt/impl/test/mnode/dmnode.cpp b/source/dnode/mgmt/impl/test/mnode/dmnode.cpp
index edaecef49e4cf5d67603864a40d5477b8615e818..8655bcb774fa1ea0125a3a8cc4755d38b201bb8d 100644
--- a/source/dnode/mgmt/impl/test/mnode/dmnode.cpp
+++ b/source/dnode/mgmt/impl/test/mnode/dmnode.cpp
@@ -16,25 +16,27 @@ class DndTestMnode : public ::testing::Test {
   static void SetUpTestSuite() { test.Init("/tmp/dnode_test_mnode", 9114); }
   static void TearDownTestSuite() { test.Cleanup(); }
 
-  static Testbase   test;
+  static Testbase test;
 
  public:
   void SetUp() override {}
   void TearDown() override {}
 };
 
-Testbase   DndTestMnode::test;
+Testbase DndTestMnode::test;
 
 TEST_F(DndTestMnode, 01_Create_Mnode) {
   {
-    int32_t contLen = sizeof(SDCreateMnodeReq);
+    SDCreateMnodeReq createReq = {0};
+    createReq.dnodeId = 2;
+    createReq.replica = 1;
+    createReq.replicas[0].id = 1;
+    createReq.replicas[0].port = 9113;
+    strcpy(createReq.replicas[0].fqdn, "localhost");
 
-    SDCreateMnodeReq* pReq = (SDCreateMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(2);
-    pReq->replica = 1;
-    pReq->replicas[0].id = htonl(1);
-    pReq->replicas[0].port = htonl(9113);
-    strcpy(pReq->replicas[0].fqdn, "localhost");
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &createReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &createReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_CREATE_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -42,14 +44,16 @@ TEST_F(DndTestMnode, 01_Create_Mnode) {
   }
 
   {
-    int32_t contLen = sizeof(SDCreateMnodeReq);
+    SDCreateMnodeReq createReq = {0};
+    createReq.dnodeId = 1;
+    createReq.replica = 1;
+    createReq.replicas[0].id = 2;
+    createReq.replicas[0].port = 9113;
+    strcpy(createReq.replicas[0].fqdn, "localhost");
 
-    SDCreateMnodeReq* pReq = (SDCreateMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(1);
-    pReq->replica = 1;
-    pReq->replicas[0].id = htonl(2);
-    pReq->replicas[0].port = htonl(9113);
-    strcpy(pReq->replicas[0].fqdn, "localhost");
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &createReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &createReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_CREATE_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -57,17 +61,19 @@ TEST_F(DndTestMnode, 01_Create_Mnode) {
   }
 
   {
-    int32_t contLen = sizeof(SDCreateMnodeReq);
-
-    SDCreateMnodeReq* pReq = (SDCreateMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(1);
-    pReq->replica = 2;
-    pReq->replicas[0].id = htonl(1);
-    pReq->replicas[0].port = htonl(9113);
-    strcpy(pReq->replicas[0].fqdn, "localhost");
-    pReq->replicas[1].id = htonl(1);
-    pReq->replicas[1].port = htonl(9114);
-    strcpy(pReq->replicas[1].fqdn, "localhost");
+    SDCreateMnodeReq createReq = {0};
+    createReq.dnodeId = 1;
+    createReq.replica = 2;
+    createReq.replicas[0].id = 1;
+    createReq.replicas[0].port = 9113;
+    strcpy(createReq.replicas[0].fqdn, "localhost");
+    createReq.replicas[1].id = 1;
+    createReq.replicas[1].port = 9114;
+    strcpy(createReq.replicas[1].fqdn, "localhost");
+
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &createReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &createReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_CREATE_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -76,15 +82,17 @@ TEST_F(DndTestMnode, 01_Create_Mnode) {
 }
 
 TEST_F(DndTestMnode, 02_Alter_Mnode) {
-   {
-    int32_t contLen = sizeof(SDAlterMnodeReq);
+  {
+    SDAlterMnodeReq alterReq = {0};
+    alterReq.dnodeId = 2;
+    alterReq.replica = 1;
+    alterReq.replicas[0].id = 1;
+    alterReq.replicas[0].port = 9113;
+    strcpy(alterReq.replicas[0].fqdn, "localhost");
 
-    SDAlterMnodeReq* pReq = (SDAlterMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(2);
-    pReq->replica = 1;
-    pReq->replicas[0].id = htonl(1);
-    pReq->replicas[0].port = htonl(9113);
-    strcpy(pReq->replicas[0].fqdn, "localhost");
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &alterReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &alterReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_ALTER_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -92,14 +100,16 @@ TEST_F(DndTestMnode, 02_Alter_Mnode) {
   }
 
   {
-    int32_t contLen = sizeof(SDAlterMnodeReq);
+    SDAlterMnodeReq alterReq = {0};
+    alterReq.dnodeId = 1;
+    alterReq.replica = 1;
+    alterReq.replicas[0].id = 2;
+    alterReq.replicas[0].port = 9113;
+    strcpy(alterReq.replicas[0].fqdn, "localhost");
 
-    SDAlterMnodeReq* pReq = (SDAlterMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(1);
-    pReq->replica = 1;
-    pReq->replicas[0].id = htonl(2);
-    pReq->replicas[0].port = htonl(9113);
-    strcpy(pReq->replicas[0].fqdn, "localhost");
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &alterReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &alterReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_ALTER_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -107,14 +117,16 @@ TEST_F(DndTestMnode, 02_Alter_Mnode) {
   }
 
   {
-    int32_t contLen = sizeof(SDAlterMnodeReq);
+    SDAlterMnodeReq alterReq = {0};
+    alterReq.dnodeId = 1;
+    alterReq.replica = 1;
+    alterReq.replicas[0].id = 1;
+    alterReq.replicas[0].port = 9113;
+    strcpy(alterReq.replicas[0].fqdn, "localhost");
 
-    SDAlterMnodeReq* pReq = (SDAlterMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(1);
-    pReq->replica = 1;
-    pReq->replicas[0].id = htonl(1);
-    pReq->replicas[0].port = htonl(9113);
-    strcpy(pReq->replicas[0].fqdn, "localhost");
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &alterReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &alterReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_ALTER_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -124,10 +136,12 @@ TEST_F(DndTestMnode, 02_Alter_Mnode) {
 
 TEST_F(DndTestMnode, 03_Drop_Mnode) {
   {
-    int32_t contLen = sizeof(SDDropMnodeReq);
+    SDDropMnodeReq dropReq = {0};
+    dropReq.dnodeId = 2;
 
-    SDDropMnodeReq* pReq = (SDDropMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(2);
+    int32_t contLen = tSerializeSMCreateDropMnodeReq(NULL, 0, &dropReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSMCreateDropMnodeReq(pReq, contLen, &dropReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_DROP_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -135,10 +149,12 @@ TEST_F(DndTestMnode, 03_Drop_Mnode) {
   }
 
   {
-    int32_t contLen = sizeof(SDDropMnodeReq);
+    SDDropMnodeReq dropReq = {0};
+    dropReq.dnodeId = 1;
 
-    SDDropMnodeReq* pReq = (SDDropMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(1);
+    int32_t contLen = tSerializeSMCreateDropMnodeReq(NULL, 0, &dropReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSMCreateDropMnodeReq(pReq, contLen, &dropReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_DROP_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -146,10 +162,12 @@ TEST_F(DndTestMnode, 03_Drop_Mnode) {
   }
 
   {
-    int32_t contLen = sizeof(SDDropMnodeReq);
+    SDDropMnodeReq dropReq = {0};
+    dropReq.dnodeId = 1;
 
-    SDDropMnodeReq* pReq = (SDDropMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(1);
+    int32_t contLen = tSerializeSMCreateDropMnodeReq(NULL, 0, &dropReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSMCreateDropMnodeReq(pReq, contLen, &dropReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_DROP_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -157,30 +175,33 @@ TEST_F(DndTestMnode, 03_Drop_Mnode) {
   }
 
   {
-    int32_t contLen = sizeof(SDAlterMnodeReq);
+    SDAlterMnodeReq alterReq = {0};
+    alterReq.dnodeId = 1;
+    alterReq.replica = 1;
+    alterReq.replicas[0].id = 1;
+    alterReq.replicas[0].port = 9113;
+    strcpy(alterReq.replicas[0].fqdn, "localhost");
 
-    SDAlterMnodeReq* pReq = (SDAlterMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(1);
-    pReq->replica = 1;
-    pReq->replicas[0].id = htonl(1);
-    pReq->replicas[0].port = htonl(9113);
-    strcpy(pReq->replicas[0].fqdn, "localhost");
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &alterReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &alterReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_ALTER_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
     ASSERT_EQ(pRsp->code, TSDB_CODE_DND_MNODE_NOT_DEPLOYED);
   }
 
-  
   {
-    int32_t contLen = sizeof(SDCreateMnodeReq);
-
-    SDCreateMnodeReq* pReq = (SDCreateMnodeReq*)rpcMallocCont(contLen);
-    pReq->dnodeId = htonl(1);
-    pReq->replica = 2;
-    pReq->replicas[0].id = htonl(1);
-    pReq->replicas[0].port = htonl(9113);
-    strcpy(pReq->replicas[0].fqdn, "localhost");
+    SDCreateMnodeReq createReq = {0};
+    createReq.dnodeId = 1;
+    createReq.replica = 2;
+    createReq.replicas[0].id = 1;
+    createReq.replicas[0].port = 9113;
+    strcpy(createReq.replicas[0].fqdn, "localhost");
+
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &createReq);
+    void*   pReq = rpcMallocCont(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &createReq);
 
     SRpcMsg* pRsp = test.SendReq(TDMT_DND_CREATE_MNODE, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
diff --git a/source/dnode/mnode/impl/src/mndAuth.c b/source/dnode/mnode/impl/src/mndAuth.c
index afebb066b35acb2f0e3d14ce412b796821228565..3d70dd3717fe0914fc1e4a2ab15fce946060a527 100644
--- a/source/dnode/mnode/impl/src/mndAuth.c
+++ b/source/dnode/mnode/impl/src/mndAuth.c
@@ -46,15 +46,25 @@ int32_t mndRetriveAuth(SMnode *pMnode, char *user, char *spi, char *encrypt, cha
 }
 
 static int32_t mndProcessAuthReq(SMnodeMsg *pReq) {
-  SAuthReq *pAuth = pReq->rpcMsg.pCont;
+  SAuthReq authReq = {0};
+  if (tDeserializeSAuthReq(pReq->pCont, pReq->contLen, &authReq) != 0) {
+    terrno = TSDB_CODE_INVALID_MSG;
+    return -1;
+  }
+
+  SAuthReq authRsp = {0};
+  memcpy(authRsp.user, authReq.user, TSDB_USER_LEN);
 
-  int32_t   contLen = sizeof(SAuthRsp);
-  SAuthRsp *pRsp = rpcMallocCont(contLen);
+  int32_t code =
+      mndRetriveAuth(pReq->pMnode, authRsp.user, &authRsp.spi, &authRsp.encrypt, authRsp.secret, authRsp.ckey);
+  mTrace("user:%s, auth req received, spi:%d encrypt:%d ruser:%s", pReq->user, authRsp.spi, authRsp.encrypt,
+         authRsp.user);
+
+  int32_t contLen = tSerializeSAuthReq(NULL, 0, &authRsp);
+  void   *pRsp = rpcMallocCont(contLen);
+  tSerializeSAuthReq(pRsp, contLen, &authRsp);
   pReq->pCont = pRsp;
   pReq->contLen = contLen;
-
-  int32_t code = mndRetriveAuth(pReq->pMnode, pAuth->user, &pRsp->spi, &pRsp->encrypt, pRsp->secret, pRsp->ckey);
-  mTrace("user:%s, auth req received, spi:%d encrypt:%d ruser:%s", pReq->user, pAuth->spi, pAuth->encrypt, pAuth->user);
   return code;
 }
 
diff --git a/source/dnode/mnode/impl/src/mndMnode.c b/source/dnode/mnode/impl/src/mndMnode.c
index 1ba9f77b458ef0c336f11986b5bf7b83c1c6ec5c..720dc1b535653dcb98c1491769d43fc577bc6cd8 100644
--- a/source/dnode/mnode/impl/src/mndMnode.c
+++ b/source/dnode/mnode/impl/src/mndMnode.c
@@ -284,8 +284,8 @@ static int32_t mndSetCreateMnodeRedoActions(SMnode *pMnode, STrans *pTrans, SDno
     if (pIter == NULL) break;
 
     SReplica *pReplica = &createReq.replicas[numOfReplicas];
-    pReplica->id = htonl(pMObj->id);
-    pReplica->port = htons(pMObj->pDnode->port);
+    pReplica->id = pMObj->id;
+    pReplica->port = pMObj->pDnode->port;
     memcpy(pReplica->fqdn, pMObj->pDnode->fqdn, TSDB_FQDN_LEN);
     numOfReplicas++;
 
@@ -293,8 +293,8 @@ static int32_t mndSetCreateMnodeRedoActions(SMnode *pMnode, STrans *pTrans, SDno
   }
 
   SReplica *pReplica = &createReq.replicas[numOfReplicas];
-  pReplica->id = htonl(pDnode->id);
-  pReplica->port = htons(pDnode->port);
+  pReplica->id = pDnode->id;
+  pReplica->port = pDnode->port;
   memcpy(pReplica->fqdn, pDnode->fqdn, TSDB_FQDN_LEN);
   numOfReplicas++;
 
@@ -307,18 +307,14 @@ static int32_t mndSetCreateMnodeRedoActions(SMnode *pMnode, STrans *pTrans, SDno
 
     STransAction action = {0};
 
-    SDAlterMnodeReq *pReq = malloc(sizeof(SDAlterMnodeReq));
-    if (pReq == NULL) {
-      sdbCancelFetch(pSdb, pIter);
-      sdbRelease(pSdb, pMObj);
-      return -1;
-    }
-    memcpy(pReq, &createReq, sizeof(SDAlterMnodeReq));
+    createReq.dnodeId = pMObj->id;
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &createReq);
+    void   *pReq = malloc(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &createReq);
 
-    pReq->dnodeId = htonl(pMObj->id);
     action.epSet = mndGetDnodeEpset(pMObj->pDnode);
     action.pCont = pReq;
-    action.contLen = sizeof(SDAlterMnodeReq);
+    action.contLen = contLen;
     action.msgType = TDMT_DND_ALTER_MNODE;
     action.acceptableCode = TSDB_CODE_DND_MNODE_ALREADY_DEPLOYED;
 
@@ -336,14 +332,14 @@ static int32_t mndSetCreateMnodeRedoActions(SMnode *pMnode, STrans *pTrans, SDno
     STransAction action = {0};
     action.epSet = mndGetDnodeEpset(pDnode);
 
-    SDCreateMnodeReq *pReq = malloc(sizeof(SDCreateMnodeReq));
-    if (pReq == NULL) return -1;
-    memcpy(pReq, &createReq, sizeof(SDAlterMnodeReq));
-    pReq->dnodeId = htonl(pObj->id);
+    createReq.dnodeId = pObj->id;
+    int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &createReq);
+    void   *pReq = malloc(contLen);
+    tSerializeSDCreateMnodeReq(pReq, contLen, &createReq);
 
     action.epSet = mndGetDnodeEpset(pDnode);
     action.pCont = pReq;
-    action.contLen = sizeof(SDCreateMnodeReq);
+    action.contLen = contLen;
     action.msgType = TDMT_DND_CREATE_MNODE;
     action.acceptableCode = TSDB_CODE_DND_MNODE_ALREADY_DEPLOYED;
     if (mndTransAppendRedoAction(pTrans, &action) != 0) {
@@ -463,8 +459,8 @@ static int32_t mndSetDropMnodeRedoActions(SMnode *pMnode, STrans *pTrans, SDnode
 
     if (pMObj->id != pObj->id) {
       SReplica *pReplica = &alterReq.replicas[numOfReplicas];
-      pReplica->id = htonl(pMObj->id);
-      pReplica->port = htons(pMObj->pDnode->port);
+      pReplica->id = pMObj->id;
+      pReplica->port = pMObj->pDnode->port;
       memcpy(pReplica->fqdn, pMObj->pDnode->fqdn, TSDB_FQDN_LEN);
       numOfReplicas++;
     }
@@ -481,18 +477,14 @@ static int32_t mndSetDropMnodeRedoActions(SMnode *pMnode, STrans *pTrans, SDnode
     if (pMObj->id != pObj->id) {
       STransAction action = {0};
 
-      SDAlterMnodeReq *pReq = malloc(sizeof(SDAlterMnodeReq));
-      if (pReq == NULL) {
-        sdbCancelFetch(pSdb, pIter);
-        sdbRelease(pSdb, pMObj);
-        return -1;
-      }
-      memcpy(pReq, &alterReq, sizeof(SDAlterMnodeReq));
+      alterReq.dnodeId = pMObj->id;
+      int32_t contLen = tSerializeSDCreateMnodeReq(NULL, 0, &alterReq);
+      void   *pReq = malloc(contLen);
+      tSerializeSDCreateMnodeReq(pReq, contLen, &alterReq);
 
-      pReq->dnodeId = htonl(pMObj->id);
       action.epSet = mndGetDnodeEpset(pMObj->pDnode);
       action.pCont = pReq;
-      action.contLen = sizeof(SDAlterMnodeReq);
+      action.contLen = contLen;
       action.msgType = TDMT_DND_ALTER_MNODE;
       action.acceptableCode = TSDB_CODE_DND_MNODE_ALREADY_DEPLOYED;
 
@@ -511,16 +503,15 @@ static int32_t mndSetDropMnodeRedoActions(SMnode *pMnode, STrans *pTrans, SDnode
     STransAction action = {0};
     action.epSet = mndGetDnodeEpset(pDnode);
 
-    SDDropMnodeReq *pReq = malloc(sizeof(SDDropMnodeReq));
-    if (pReq == NULL) {
-      terrno = TSDB_CODE_OUT_OF_MEMORY;
-      return -1;
-    }
-    pReq->dnodeId = htonl(pObj->id);
+    SDDropMnodeReq dropReq = {0};
+    dropReq.dnodeId = pObj->id;
+    int32_t contLen = tSerializeSMCreateDropMnodeReq(NULL, 0, &dropReq);
+    void   *pReq = malloc(contLen);
+    tSerializeSMCreateDropMnodeReq(pReq, contLen, &dropReq);
 
     action.epSet = mndGetDnodeEpset(pDnode);
     action.pCont = pReq;
-    action.contLen = sizeof(SDDropMnodeReq);
+    action.contLen = contLen;
     action.msgType = TDMT_DND_DROP_MNODE;
     action.acceptableCode = TSDB_CODE_DND_MNODE_NOT_DEPLOYED;
     if (mndTransAppendRedoAction(pTrans, &action) != 0) {