diff --git a/source/dnode/mnode/impl/src/mndStreamTrans.c b/source/dnode/mnode/impl/src/mndStreamTrans.c
new file mode 100644
index 0000000000..aec72339e0
--- /dev/null
+++ b/source/dnode/mnode/impl/src/mndStreamTrans.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "mndTrans.h"
+#include "mndStream.h"
+
+typedef struct SKeyInfo {
+  void*   pKey;
+  int32_t keyLen;
+} SKeyInfo;
+
+static int32_t clearFinishedTrans(SMnode* pMnode);
+
+int32_t mndStreamRegisterTrans(STrans* pTrans, const char* pName, const char* pSrcDb, const char* pDstDb) {
+  SStreamTransInfo info = {.transId = pTrans->id, .startTime = taosGetTimestampMs(), .name = pName};
+  taosHashPut(execInfo.transMgmt.pDBTrans, pSrcDb, strlen(pSrcDb), &info, sizeof(SStreamTransInfo));
+
+  if (strcmp(pSrcDb, pDstDb) != 0) {
+    taosHashPut(execInfo.transMgmt.pDBTrans, pDstDb, strlen(pDstDb), &info, sizeof(SStreamTransInfo));
+  }
+
+  return 0;
+}
+
+int32_t clearFinishedTrans(SMnode* pMnode) {
+  SArray* pList = taosArrayInit(4, sizeof(SKeyInfo));
+  size_t  keyLen = 0;
+
+  taosThreadMutexLock(&execInfo.lock);
+
+  void* pIter = NULL;
+  while ((pIter = taosHashIterate(execInfo.transMgmt.pDBTrans, pIter)) != NULL) {
+    SStreamTransInfo *pEntry = (SStreamTransInfo *)pIter;
+    STrans* pTrans = mndAcquireTrans(pMnode, pEntry->transId);
+
+    // let's clear the finished trans
+    if (pTrans == NULL) {
+      void* pKey = taosHashGetKey(pEntry, &keyLen);
+      // key is the name of src/dst db name
+      SKeyInfo info = {.pKey = pKey, .keyLen = keyLen};
+
+      mDebug("transId:%d %s startTs:%" PRId64 "cleared due to finished", pEntry->transId, pEntry->name,
+             pEntry->startTime);
+      taosArrayPush(pList, &info);
+    } else {
+      mndReleaseTrans(pMnode, pTrans);
+    }
+  }
+
+  size_t num = taosArrayGetSize(pList);
+  for(int32_t i = 0; i < num; ++i) {
+    SKeyInfo* pKey = taosArrayGet(pList, i);
+    taosHashRemove(execInfo.transMgmt.pDBTrans, pKey->pKey, pKey->keyLen);
+  }
+
+  mDebug("clear %d finished stream-trans, remained:%d", (int32_t) num, taosHashGetSize(execInfo.transMgmt.pDBTrans));
+  taosThreadMutexUnlock(&execInfo.lock);
+
+  terrno = TSDB_CODE_SUCCESS;
+  taosArrayDestroy(pList);
+  return 0;
+}
+
+bool streamTransConflictOtherTrans(SMnode* pMnode, const char* pSrcDb, const char* pDstDb) {
+  clearFinishedTrans(pMnode);
+
+  taosThreadMutexLock(&execInfo.lock);
+  int32_t num = taosHashGetSize(execInfo.transMgmt.pDBTrans);
+  if (num <= 0) {
+    taosThreadMutexUnlock(&execInfo.lock);
+    return false;
+  }
+
+  SStreamTransInfo *pEntry = taosHashGet(execInfo.transMgmt.pDBTrans, pSrcDb, strlen(pSrcDb));
+  if (pEntry != NULL) {
+    taosThreadMutexUnlock(&execInfo.lock);
+    return true;
+  }
+
+  pEntry = taosHashGet(execInfo.transMgmt.pDBTrans, pDstDb, strlen(pDstDb));
+  if (pEntry != NULL) {
+    taosThreadMutexUnlock(&execInfo.lock);
+    return true;
+  }
+
+  taosThreadMutexUnlock(&execInfo.lock);
+  return false;
+}
+
+
+