diff --git a/source/dnode/mnode/impl/src/mndCluster.c b/source/dnode/mnode/impl/src/mndCluster.c
index a41ccd9896..3410a386da 100644
--- a/source/dnode/mnode/impl/src/mndCluster.c
+++ b/source/dnode/mnode/impl/src/mndCluster.c
@@ -52,7 +52,7 @@ int32_t mndGetClusterName(SMnode *pMnode, char *clusterName, int32_t len) {
   SSdb *pSdb = pMnode->pSdb;
 
   SClusterObj *pCluster = sdbAcquire(pSdb, SDB_CLUSTER, &pMnode->clusterId);
-  if (pCluster = NULL) {
+  if (pCluster == NULL) {
     return -1;
   }
 
diff --git a/source/dnode/mnode/impl/src/mndTelem.c b/source/dnode/mnode/impl/src/mndTelem.c
index a9cf8f9fab..922910b658 100644
--- a/source/dnode/mnode/impl/src/mndTelem.c
+++ b/source/dnode/mnode/impl/src/mndTelem.c
@@ -20,9 +20,10 @@
 #include "tbuffer.h"
 #include "tversion.h"
 
-#define TELEMETRY_SERVER "telemetry.taosdata.com"
-#define TELEMETRY_PORT 80
-#define REPORT_INTERVAL 86400
+// #define TELEMETRY_SERVER "telemetry.taosdata.com"
+#define TELEMETRY_SERVER "localhost"
+#define TELEMETRY_PORT   80
+#define REPORT_INTERVAL  86400
 
 static void mndBeginObject(SBufferWriter* bw) { tbufWriteChar(bw, '{'); }
 
@@ -33,25 +34,8 @@ static void mndCloseObject(SBufferWriter* bw) {
   } else {
     tbufWriteChar(bw, '}');
   }
-  tbufWriteChar(bw, ',');
 }
 
-#if 0
-static void beginArray(SBufferWriter* bw) {
-  tbufWriteChar(bw, '[');
-}
-
-static void closeArray(SBufferWriter* bw) {
-  size_t len = tbufTell(bw);
-  if (tbufGetData(bw, false)[len - 1] == ',') {
-    tbufWriteCharAt(bw, len - 1, ']');
-  } else {
-    tbufWriteChar(bw, ']');
-  }
-  tbufWriteChar(bw, ',');
-}
-#endif
-
 static void mndWriteString(SBufferWriter* bw, const char* str) {
   tbufWriteChar(bw, '"');
   tbufWrite(bw, str, strlen(str));
@@ -61,7 +45,7 @@ static void mndWriteString(SBufferWriter* bw, const char* str) {
 static void mndAddIntField(SBufferWriter* bw, const char* k, int64_t v) {
   mndWriteString(bw, k);
   tbufWriteChar(bw, ':');
-  char buf[32];
+  char buf[32] = {0};
   sprintf(buf, "%" PRId64, v);
   tbufWrite(bw, buf, strlen(buf));
   tbufWriteChar(bw, ',');
@@ -184,24 +168,17 @@ static void mndAddRuntimeInfo(SMnode* pMnode, SBufferWriter* bw) {
 }
 
 static void mndSendTelemetryReport(SMnode* pMnode) {
-  STelemMgmt* pMgmt = &pMnode->telemMgmt;
-
-  char     buf[128] = {0};
-  uint32_t ip = taosGetIpv4FromFqdn(TELEMETRY_SERVER);
-  if (ip == 0xffffffff) {
-    mDebug("failed to get IP address of " TELEMETRY_SERVER " since :%s", strerror(errno));
-    return;
-  }
-  SOCKET fd = taosOpenTcpClientSocket(ip, TELEMETRY_PORT, 0);
-  if (fd < 0) {
-    mDebug("failed to create socket for telemetry, reason:%s", strerror(errno));
-    return;
-  }
+  STelemMgmt*   pMgmt = &pMnode->telemMgmt;
+  SBufferWriter bw = tbufInitWriter(NULL, false);
+  int32_t       code = -1;
+  char          buf[128] = {0};
+  SOCKET        fd = 0;
 
   char clusterName[64] = {0};
-  mndGetClusterName(pMnode, clusterName, sizeof(clusterName));
+  if (mndGetClusterName(pMnode, clusterName, sizeof(clusterName)) != 0) {
+    goto SEND_OVER;
+  }
 
-  SBufferWriter bw = tbufInitWriter(NULL, false);
   mndBeginObject(&bw);
   mndAddStringField(&bw, "instanceId", clusterName);
   mndAddIntField(&bw, "reportVersion", 1);
@@ -212,32 +189,64 @@ static void mndSendTelemetryReport(SMnode* pMnode) {
   mndAddRuntimeInfo(pMnode, &bw);
   mndCloseObject(&bw);
 
+  uint32_t ip = taosGetIpv4FromFqdn(TELEMETRY_SERVER);
+  if (ip == 0xffffffff) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    mError("failed to get ip of %s since :%s", TELEMETRY_SERVER, terrstr());
+    goto SEND_OVER;
+  }
+
+  fd = taosOpenTcpClientSocket(ip, TELEMETRY_PORT, 0);
+  if (fd < 0) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    mError("failed to create socket to %s:%d since:%s", TELEMETRY_SERVER, TELEMETRY_PORT, terrstr());
+    goto SEND_OVER;
+  }
+
   const char* header =
       "POST /report HTTP/1.1\n"
       "Host: " TELEMETRY_SERVER
       "\n"
       "Content-Type: application/json\n"
       "Content-Length: ";
+  if (taosWriteSocket(fd, (void*)header, (int32_t)strlen(header)) < 0) {
+    goto SEND_OVER;
+  }
 
-  taosWriteSocket(fd, (void*)header, (int32_t)strlen(header));
-  int32_t contLen = (int32_t)(tbufTell(&bw) - 1);
+  int32_t contLen = (int32_t)(tbufTell(&bw));
   sprintf(buf, "%d\n\n", contLen);
-  taosWriteSocket(fd, buf, (int32_t)strlen(buf));
-  taosWriteSocket(fd, tbufGetData(&bw, false), contLen);
-  tbufCloseWriter(&bw);
+  if (taosWriteSocket(fd, buf, (int32_t)strlen(buf)) < 0) {
+    goto SEND_OVER;
+  }
+
+  const char* pCont = tbufGetData(&bw, false);
+  if (taosWriteSocket(fd, (void*)pCont, contLen) < 0) {
+    goto SEND_OVER;
+  }
 
   // read something to avoid nginx error 499
   if (taosReadSocket(fd, buf, 10) < 0) {
-    mDebug("failed to receive response since %s", strerror(errno));
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    mError("failed to receive response since %s", terrstr());
+    goto SEND_OVER;
   }
 
+  mInfo("send telemetry to %s:%d, len:%d content: %s", TELEMETRY_SERVER, TELEMETRY_PORT, contLen, pCont);
+  code = 0;
+
+SEND_OVER:
+  tbufCloseWriter(&bw);
   taosCloseSocket(fd);
+
+  if (code != 0) {
+    mError("failed to send telemetry to %s:%d since %s", TELEMETRY_SERVER, TELEMETRY_PORT, terrstr());
+  }
 }
 
 static int32_t mndProcessTelemTimer(SMnodeMsg* pReq) {
   SMnode*     pMnode = pReq->pMnode;
   STelemMgmt* pMgmt = &pMnode->telemMgmt;
-  if (!pMgmt->enable) return 0;
+  // if (!pMgmt->enable) return 0;
 
   taosWLockLatch(&pMgmt->lock);
   mndSendTelemetryReport(pMnode);
diff --git a/source/dnode/mnode/impl/src/mnode.c b/source/dnode/mnode/impl/src/mnode.c
index b9085c0600..27b4651b8c 100644
--- a/source/dnode/mnode/impl/src/mnode.c
+++ b/source/dnode/mnode/impl/src/mnode.c
@@ -144,6 +144,8 @@ static void mndCleanupTimer(SMnode *pMnode) {
     pMnode->transTimer = NULL;
     taosTmrStop(pMnode->mqTimer);
     pMnode->mqTimer = NULL;
+    taosTmrStop(pMnode->telemTimer);
+    pMnode->telemTimer = NULL;
     taosTmrCleanUp(pMnode->timer);
     pMnode->timer = NULL;
   }