diff --git a/source/libs/function/src/tudf.c b/source/libs/function/src/tudf.c
index 0414841ba4..4841e05267 100644
--- a/source/libs/function/src/tudf.c
+++ b/source/libs/function/src/tudf.c
@@ -25,8 +25,6 @@
 #include "functionMgt.h"
 
 //TODO: add unit test
-//TODO: include all global variable under context struct
-
 typedef struct SUdfdData {
   bool          startCalled;
   bool          needCleanUp;
@@ -1275,7 +1273,6 @@ int32_t udfcRunUdfUvTask(SClientUdfTask *task, int8_t uvTaskType) {
 }
 
 int32_t doSetupUdf(char udfName[], UdfcFuncHandle *funcHandle) {
-  fnInfo("udfc setup udf. udfName: %s", udfName);
   if (gUdfdProxy.udfcState != UDFC_STATE_READY) {
     return TSDB_CODE_UDF_INVALID_STATE;
   }
@@ -1305,7 +1302,7 @@ int32_t doSetupUdf(char udfName[], UdfcFuncHandle *funcHandle) {
   if (task->errCode != 0) {
     fnError("failed to setup udf. udfname: %s, err: %d", udfName, task->errCode)
   } else {
-    fnInfo("sucessfully setup udf func handle. handle: %p", task->session);
+    fnInfo("sucessfully setup udf func handle. udfName: %s, handle: %p", udfName, task->session);
     *funcHandle = task->session;
   }
   int32_t err = task->errCode;
@@ -1490,13 +1487,11 @@ int32_t callUdfScalarFunc(char *udfName, SScalarParam *input, int32_t numOfCols,
   return code;
 }
 
-//TODO: when to teardown udf. teardown udf is not called
 int32_t doTeardownUdf(UdfcFuncHandle handle) {
-  fnInfo("tear down udf. udf func handle: %p", handle);
-
   SUdfcUvSession *session = (SUdfcUvSession *) handle;
+
   if (session->udfUvPipe == NULL) {
-    fnError("pipe to udfd does not exist");
+    fnError("tear down udf. pipe to udfd does not exist. udf name: %s", session->udfName);
     return TSDB_CODE_UDF_PIPE_NO_PIPE;
   }
 
@@ -1511,7 +1506,6 @@ int32_t doTeardownUdf(UdfcFuncHandle handle) {
   udfcRunUdfUvTask(task, UV_TASK_REQ_RSP);
 
   SUdfTeardownResponse *rsp = &task->_teardown.rsp;
-
   int32_t err = task->errCode;
 
   udfcRunUdfUvTask(task, UV_TASK_DISCONNECT);
@@ -1519,6 +1513,8 @@ int32_t doTeardownUdf(UdfcFuncHandle handle) {
   taosMemoryFree(task->session);
   taosMemoryFree(task);
 
+  fnInfo("tear down udf. udf name: %s, udf func handle: %p", session->udfName, handle);
+
   return err;
 }
 
@@ -1651,26 +1647,22 @@ int32_t udfAggFinalize(struct SqlFunctionCtx *pCtx, SSDataBlock* pBlock) {
     GET_RES_INFO(pCtx)->numOfRes = udfRes->finalResNum;
   }
 
-//  int32_t code = doTeardownUdf(session);
-//  if (code != 0) {
-//    fnError("udfAggFinalize error. doTeardownUdf step. udf code: %d", code);
-//  }
-
   int32_t numOfResults = functionFinalizeWithResultBuf(pCtx, pBlock, udfRes->finalResBuf);
   releaseUdfFuncHandle(pCtx->udfName);
   return udfCallCode == 0 ? numOfResults : udfCallCode;
 }
 
 int32_t cleanUpUdfs() {
-  fnInfo("clean up udf unused function handles");
   uv_mutex_lock(&gUdfdProxy.udfStubsMutex);
   int32_t i = 0;
   SArray* udfStubs = taosArrayInit(16, sizeof(SUdfcFuncStub));
   while (i < taosArrayGetSize(gUdfdProxy.udfStubs)) {
     SUdfcFuncStub *stub = taosArrayGet(gUdfdProxy.udfStubs, i);
     if (stub->refCount == 0) {
+      fnInfo("tear down udf. udf name: %s, handle: %p", stub->udfName, stub->handle);
       doTeardownUdf(stub->handle);
     } else {
+      fnInfo("udf still in use. udf name: %s, ref count: %d, handle: %p", stub->udfName, stub->refCount, stub->handle);
       taosArrayPush(udfStubs, stub);
     }
     ++i;