diff --git a/cmake/cmake.define b/cmake/cmake.define
index 1500858d9f541a061803c7bc76c514927813d5a2..f55a9bdabc79e31f129b2184144c9472572d5454 100644
--- a/cmake/cmake.define
+++ b/cmake/cmake.define
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.0)
 
-set(CMAKE_VERBOSE_MAKEFILE ON)
+set(CMAKE_VERBOSE_MAKEFILE OFF)
 set(TD_BUILD_TAOSA_INTERNAL FALSE)
 
 #set output directory
diff --git a/include/libs/stream/streamState.h b/include/libs/stream/streamState.h
index 9b80ce27860a639a8a406ee886004f586940afec..301b7e7abcfb2c33ebd2d5e332753e686737b14c 100644
--- a/include/libs/stream/streamState.h
+++ b/include/libs/stream/streamState.h
@@ -27,6 +27,21 @@ extern "C" {
 #ifndef _STREAM_STATE_H_
 #define _STREAM_STATE_H_
 
+typedef struct {
+  rocksdb_t*              db;
+  rocksdb_writeoptions_t* writeOpts;
+  rocksdb_readoptions_t*  readOpts;
+  rocksdb_options_t*      dbOpt;
+  void*                   param;
+  void*                   env;
+  rocksdb_cache_t*        cache;
+  TdThreadMutex           mutex;
+  SList*                  list;
+} SBackendHandle;
+void*      streamBackendInit(const char* path);
+void       streamBackendCleanup(void* arg);
+SListNode* streamBackendAddCompare(void* backend, void* arg);
+void       streamBackendDelCompare(void* backend, void* arg);
 typedef bool (*state_key_cmpr_fn)(void* pKey1, void* pKey2);
 
 typedef struct STdbState {
@@ -35,11 +50,12 @@ typedef struct STdbState {
   rocksdb_writeoptions_t*          writeOpts;
   rocksdb_readoptions_t*           readOpts;
   rocksdb_options_t**              cfOpts;
-  rocksdb_comparator_t**           pCompare;
   rocksdb_options_t*               dbOpt;
   struct SStreamTask*              pOwner;
   void*                            param;
   void*                            env;
+  SListNode*                       pComparNode;
+  SBackendHandle*                  pBackendHandle;
 
   TDB* db;
   TTB* pStateDb;
@@ -58,13 +74,15 @@ typedef struct {
   int32_t           number;
   SSHashObj*        parNameMap;
   int64_t           checkPointId;
+  int32_t           taskId;
+  int32_t           streamId;
 } SStreamState;
 
 SStreamState* streamStateOpen(char* path, struct SStreamTask* pTask, bool specPath, int32_t szPage, int32_t pages);
-void          streamStateClose(SStreamState* pState);
+void          streamStateClose(SStreamState* pState, bool remove);
 int32_t       streamStateBegin(SStreamState* pState);
 int32_t       streamStateCommit(SStreamState* pState);
-void          streamStateDestroy(SStreamState* pState);
+void          streamStateDestroy(SStreamState* pState, bool remove);
 int32_t       streamStateDeleteCheckPoint(SStreamState* pState, TSKEY mark);
 
 typedef struct {
diff --git a/include/libs/stream/tstream.h b/include/libs/stream/tstream.h
index 1f16659499b85177f83f56fbe041dc9311d04b0f..d821c24cdda8455ab79255b9b6d1d3c57a3cf472 100644
--- a/include/libs/stream/tstream.h
+++ b/include/libs/stream/tstream.h
@@ -347,6 +347,7 @@ typedef struct SStreamMeta {
   int32_t      vgId;
   SRWLatch     lock;
   int32_t      walScan;
+  void*        streamBackend;
 } SStreamMeta;
 
 int32_t tEncodeStreamEpInfo(SEncoder* pEncoder, const SStreamChildEpInfo* pInfo);
diff --git a/include/util/tlist.h b/include/util/tlist.h
index e9a81d350e33cbc929a2a41daa83221eb84538ac..c684e90a3318444b706720dee0b64ba220437aee 100644
--- a/include/util/tlist.h
+++ b/include/util/tlist.h
@@ -228,6 +228,7 @@ void       tdListPrependNode(SList *list, SListNode *node);
 void       tdListAppendNode(SList *list, SListNode *node);
 int32_t    tdListPrepend(SList *list, void *data);
 int32_t    tdListAppend(SList *list, const void *data);
+SListNode *tdListAdd(SList *list, const void *data);
 SListNode *tdListPopHead(SList *list);
 SListNode *tdListPopTail(SList *list);
 SListNode *tdListGetHead(SList *list);
diff --git a/source/dnode/vnode/src/sma/smaRollup.c b/source/dnode/vnode/src/sma/smaRollup.c
index ce987ca88ec930db76fcb560ff79f758e2bed1a2..f9078c257d0a75e90855e9c6f53d0501ee13868a 100644
--- a/source/dnode/vnode/src/sma/smaRollup.c
+++ b/source/dnode/vnode/src/sma/smaRollup.c
@@ -90,7 +90,7 @@ void *tdFreeRSmaInfo(SSma *pSma, SRSmaInfo *pInfo, bool isDeepFree) {
       }
 
       if (isDeepFree && pItem->pStreamState) {
-        streamStateClose(pItem->pStreamState);
+        streamStateClose(pItem->pStreamState, false);
       }
 
       if (isDeepFree && pInfo->taskInfo[i]) {
diff --git a/source/libs/stream/inc/streamBackendRocksdb.h b/source/libs/stream/inc/streamBackendRocksdb.h
index bd9300dfab234525ea3589e2bce342fd07c898d6..94caf18d553727fc3d2391f0e128c1ee4e392dae 100644
--- a/source/libs/stream/inc/streamBackendRocksdb.h
+++ b/source/libs/stream/inc/streamBackendRocksdb.h
@@ -24,8 +24,14 @@
 #include "tcompare.h"
 #include "ttimer.h"
 
-int  streamInitBackend(SStreamState* pState, char* path);
-void streamCleanBackend(SStreamState* pState);
+typedef struct SCfComparator {
+  rocksdb_comparator_t** comp;
+  int32_t                numOfComp;
+} SCfComparator;
+int  streamStateOpenBackend(void* backend, SStreamState* pState);
+void streamStateCloseBackend(SStreamState* pState, bool remove);
+void streamStateDestroyCompar(void* arg);
+// void streamStateRemoveBackend(SStreamState* pState);
 
 int32_t streamStateFuncPut_rocksdb(SStreamState* pState, const STupleKey* key, const void* value, int32_t vLen);
 int32_t streamStateFuncGet_rocksdb(SStreamState* pState, const STupleKey* key, void** pVal, int32_t* pVLen);
@@ -73,7 +79,7 @@ int32_t          streamStatePutParTag_rocksdb(SStreamState* pState, int64_t grou
 int32_t          streamStateGetParTag_rocksdb(SStreamState* pState, int64_t groupId, void** tagVal, int32_t* tagLen);
 int32_t streamStatePutParName_rocksdb(SStreamState* pState, int64_t groupId, const char tbname[TSDB_TABLE_NAME_LEN]);
 int32_t streamStateGetParName_rocksdb(SStreamState* pState, int64_t groupId, void** pVal);
-void    streamStateDestroy_rocksdb(SStreamState* pState);
+void    streamStateDestroy_rocksdb(SStreamState* pState, bool remove);
 
 void*   streamStateCreateBatch();
 int32_t streamStateGetBatchSize(void* pBatch);
diff --git a/source/libs/stream/src/streamMeta.c b/source/libs/stream/src/streamMeta.c
index 63141d621961e911e3c6519c371ba8eb6297fe0f..02c325d4baad017960cb7f5f96380a22bac914ad 100644
--- a/source/libs/stream/src/streamMeta.c
+++ b/source/libs/stream/src/streamMeta.c
@@ -65,6 +65,19 @@ SStreamMeta* streamMetaOpen(const char* path, void* ahandle, FTaskExpand expandF
   pMeta->vgId = vgId;
   pMeta->ahandle = ahandle;
   pMeta->expandFunc = expandFunc;
+
+  char* statePath = taosMemoryCalloc(1, len);
+  sprintf(statePath, "%s/%s", pMeta->path, "state");
+  code = taosMulModeMkDir(statePath, 0755);
+  if (code != 0) {
+    terrno = TAOS_SYSTEM_ERROR(code);
+    taosMemoryFree(streamPath);
+    goto _err;
+  }
+
+  pMeta->streamBackend = streamBackendInit(statePath);
+  taosMemoryFree(statePath);
+
   taosInitRWLatch(&pMeta->lock);
   return pMeta;
 
@@ -74,6 +87,7 @@ _err:
   if (pMeta->pTaskDb) tdbTbClose(pMeta->pTaskDb);
   if (pMeta->pCheckpointDb) tdbTbClose(pMeta->pCheckpointDb);
   if (pMeta->db) tdbClose(pMeta->db);
+  if (pMeta->streamBackend) streamBackendCleanup(pMeta->streamBackend);
   taosMemoryFree(pMeta);
   return NULL;
 }
@@ -101,6 +115,7 @@ void streamMetaClose(SStreamMeta* pMeta) {
   }
 
   taosHashCleanup(pMeta->pTasks);
+  streamBackendCleanup(pMeta->streamBackend);
   taosMemoryFree(pMeta->path);
   taosMemoryFree(pMeta);
 }
@@ -184,9 +199,7 @@ int32_t streamMetaAddDeployedTask(SStreamMeta* pMeta, int64_t ver, SStreamTask*
   return 0;
 }
 
-int32_t streamMetaGetNumOfTasks(const SStreamMeta* pMeta) {
-  return (int32_t) taosHashGetSize(pMeta->pTasks);
-}
+int32_t streamMetaGetNumOfTasks(const SStreamMeta* pMeta) { return (int32_t)taosHashGetSize(pMeta->pTasks); }
 
 SStreamTask* streamMetaAcquireTask(SStreamMeta* pMeta, int32_t taskId) {
   taosRLockLatch(&pMeta->lock);
@@ -220,7 +233,8 @@ void streamMetaRemoveTask(SStreamMeta* pMeta, int32_t taskId) {
     taosHashRemove(pMeta->pTasks, &taskId, sizeof(int32_t));
     tdbTbDelete(pMeta->pTaskDb, &taskId, sizeof(int32_t), pMeta->txn);
 
-    atomic_store_8(&pTask->status.taskStatus, TASK_STATUS__STOP);
+    //
+    atomic_store_8(&pTask->status.taskStatus, TASK_STATUS__DROPPING);
 
     taosWLockLatch(&pMeta->lock);
     streamMetaReleaseTask(pMeta, pTask);
diff --git a/source/libs/stream/src/streamState.c b/source/libs/stream/src/streamState.c
index 791d3013bfa378600711b08bb6b4f237d5fa4a7e..3467fa5ffe2e9c6584221849580fca459c8ad1d1 100644
--- a/source/libs/stream/src/streamState.c
+++ b/source/libs/stream/src/streamState.c
@@ -26,6 +26,88 @@
 
 #define MAX_TABLE_NAME_NUM 100000
 
+void* streamBackendInit(const char* path) {
+  SBackendHandle* pHandle = calloc(1, sizeof(SBackendHandle));
+  pHandle->list = tdListNew(sizeof(SCfComparator));
+  taosThreadMutexInit(&pHandle->mutex, NULL);
+
+  rocksdb_env_t* env = rocksdb_create_default_env();  // rocksdb_envoptions_create();
+  rocksdb_env_set_low_priority_background_threads(env, 4);
+  rocksdb_env_set_high_priority_background_threads(env, 2);
+
+  rocksdb_cache_t* cache = rocksdb_cache_create_lru(128 << 20);
+
+  rocksdb_options_t* opts = rocksdb_options_create();
+  rocksdb_options_set_env(opts, env);
+  rocksdb_options_set_create_if_missing(opts, 1);
+  rocksdb_options_set_create_missing_column_families(opts, 1);
+  rocksdb_options_set_write_buffer_size(opts, 128 << 20);
+  rocksdb_options_set_max_total_wal_size(opts, 128 << 20);
+  rocksdb_options_set_recycle_log_file_num(opts, 6);
+  rocksdb_options_set_max_write_buffer_number(opts, 3);
+
+  pHandle->env = env;
+  pHandle->dbOpt = opts;
+  pHandle->cache = cache;
+
+  char* err = NULL;
+  pHandle->db = rocksdb_open(opts, path, &err);
+  if (err != NULL) {
+    qError("failed to open rocksdb, path:%s, reason:%s", path, err);
+    taosMemoryFreeClear(err);
+    goto _EXIT;
+  }
+
+  return pHandle;
+_EXIT:
+  rocksdb_options_destroy(opts);
+  rocksdb_cache_destroy(cache);
+  rocksdb_env_destroy(env);
+  taosThreadMutexDestroy(&pHandle->mutex);
+  tdListFree(pHandle->list);
+  free(pHandle);
+  return NULL;
+}
+void streamBackendCleanup(void* arg) {
+  SBackendHandle* pHandle = (SBackendHandle*)arg;
+  rocksdb_close(pHandle->db);
+  rocksdb_options_destroy(pHandle->dbOpt);
+  rocksdb_env_destroy(pHandle->env);
+  rocksdb_cache_destroy(pHandle->cache);
+
+  taosThreadMutexDestroy(&pHandle->mutex);
+  SListNode* head = tdListPopHead(pHandle->list);
+  while (head != NULL) {
+    streamStateDestroyCompar(head->data);
+    taosMemoryFree(head);
+    head = tdListPopHead(pHandle->list);
+  }
+  tdListFree(pHandle->list);
+
+  taosMemoryFree(pHandle);
+
+  return;
+}
+SListNode* streamBackendAddCompare(void* backend, void* arg) {
+  SBackendHandle* pHandle = (SBackendHandle*)backend;
+  SListNode*      node = NULL;
+  taosThreadMutexLock(&pHandle->mutex);
+  node = tdListAdd(pHandle->list, arg);
+  taosThreadMutexUnlock(&pHandle->mutex);
+  return node;
+}
+void streamBackendDelCompare(void* backend, void* arg) {
+  SBackendHandle* pHandle = (SBackendHandle*)backend;
+  SListNode*      node = NULL;
+  taosThreadMutexLock(&pHandle->mutex);
+  node = tdListPopNode(pHandle->list, arg);
+  taosThreadMutexUnlock(&pHandle->mutex);
+  if (node) {
+    streamStateDestroyCompar(node->data);
+    taosMemoryFree(node);
+  }
+}
+
 int sessionRangeKeyCmpr(const SSessionKey* pWin1, const SSessionKey* pWin2) {
   if (pWin1->groupId > pWin2->groupId) {
     return 1;
@@ -100,7 +182,7 @@ SStreamState* streamStateOpen(char* path, SStreamTask* pTask, bool specPath, int
   pState->pTdbState = taosMemoryCalloc(1, sizeof(STdbState));
   if (pState->pTdbState == NULL) {
     terrno = TSDB_CODE_OUT_OF_MEMORY;
-    streamStateDestroy(pState);
+    streamStateDestroy(pState, true);
     return NULL;
   }
 
@@ -111,9 +193,11 @@ SStreamState* streamStateOpen(char* path, SStreamTask* pTask, bool specPath, int
     memset(statePath, 0, 1024);
     tstrncpy(statePath, path, 1024);
   }
+  pState->taskId = pTask->id.taskId;
+  pState->streamId = pTask->id.streamId;
 #ifdef USE_ROCKSDB
   qWarn("open stream state1");
-  int code = streamInitBackend(pState, statePath);
+  int code = streamStateOpenBackend(pTask->pMeta->streamBackend, pState);
   if (code == -1) {
     taosMemoryFree(pState);
     pState = NULL;
@@ -205,14 +289,15 @@ _err:
   tdbTbClose(pState->pTdbState->pParNameDb);
   tdbTbClose(pState->pTdbState->pParTagDb);
   tdbClose(pState->pTdbState->db);
-  streamStateDestroy(pState);
+  streamStateDestroy(pState, false);
   return NULL;
 #endif
 }
 
-void streamStateClose(SStreamState* pState) {
+void streamStateClose(SStreamState* pState, bool remove) {
 #ifdef USE_ROCKSDB
-  streamCleanBackend(pState);
+  // streamStateCloseBackend(pState);
+  streamStateDestroy(pState, remove);
 #else
   tdbCommit(pState->pTdbState->db, pState->pTdbState->txn);
   tdbPostCommit(pState->pTdbState->db, pState->pTdbState->txn);
@@ -224,7 +309,6 @@ void streamStateClose(SStreamState* pState) {
   tdbTbClose(pState->pTdbState->pParTagDb);
   tdbClose(pState->pTdbState->db);
 #endif
-  streamStateDestroy(pState);
 }
 
 int32_t streamStateBegin(SStreamState* pState) {
@@ -388,6 +472,7 @@ int32_t streamStateSaveInfo(SStreamState* pState, void* pKey, int32_t keyLen, vo
 #ifdef USE_ROCKSDB
   int32_t code = 0;
   void*   batch = streamStateCreateBatch();
+
   code = streamStatePutBatch(pState, "default", batch, pKey, pVal, vLen);
   if (code != 0) {
     return code;
@@ -1077,10 +1162,10 @@ int32_t streamStateGetParName(SStreamState* pState, int64_t groupId, void** pVal
 #endif
 }
 
-void streamStateDestroy(SStreamState* pState) {
+void streamStateDestroy(SStreamState* pState, bool remove) {
 #ifdef USE_ROCKSDB
   streamFileStateDestroy(pState->pFileState);
-  streamStateDestroy_rocksdb(pState);
+  streamStateDestroy_rocksdb(pState, remove);
   tSimpleHashCleanup(pState->parNameMap);
   // do nothong
 #endif
diff --git a/source/libs/stream/src/streamStateRocksdb.c b/source/libs/stream/src/streamStateRocksdb.c
index 9c0f81894d9f3d720c4fe9cdb0920c76c5e309f6..4f336e8e711821fa43606815bcddd446217ac9ca 100644
--- a/source/libs/stream/src/streamStateRocksdb.c
+++ b/source/libs/stream/src/streamStateRocksdb.c
@@ -324,7 +324,6 @@ int32_t streaValueIsStale(void* k, int64_t ts) {
 
 typedef struct {
   void* tableOpt;
-  void* lru;  // global or not
 } rocksdbCfParam;
 const char* cfName[] = {"default", "state", "fill", "sess", "func", "parname", "partag"};
 
@@ -358,6 +357,9 @@ typedef struct {
 
 } SCfInit;
 
+#define GEN_COLUMN_FAMILY_NAME(name, streamId, taskId, SUBFIX) \
+  sprintf(name, "%d_%d_%s", (streamId), (taskId), (SUBFIX));
+
 SCfInit ginitDict[] = {
     {"default", 7, 0, defaultKeyComp, defaultKeyEncode, defaultKeyDecode, defaultKeyToString, compareDefaultName,
      destroyFunc},
@@ -378,21 +380,9 @@ const char* compareFuncKeyName(void* name) { return ginitDict[4].key; }
 const char* compareParKeyName(void* name) { return ginitDict[5].key; }
 const char* comparePartagKeyName(void* name) { return ginitDict[6].key; }
 
-int streamInitBackend(SStreamState* pState, char* path) {
-  rocksdb_env_t* env = rocksdb_create_default_env();  // rocksdb_envoptions_create();
-  rocksdb_env_set_low_priority_background_threads(env, 4);
-  rocksdb_env_set_high_priority_background_threads(env, 2);
-
-  rocksdb_options_t* opts = rocksdb_options_create();
-  rocksdb_options_set_env(opts, env);
-  // rocksdb_options_increase_parallelism(opts, 8);
-  //  rocksdb_options_optimize_level_style_compaction(opts, 0);
-  //   create the DB if it's not already present
-  rocksdb_options_set_create_if_missing(opts, 1);
-  rocksdb_options_set_create_missing_column_families(opts, 1);
-  rocksdb_options_set_write_buffer_size(opts, 64 << 20);
-  rocksdb_options_set_recycle_log_file_num(opts, 6);
-  rocksdb_options_set_max_write_buffer_number(opts, 3);
+int streamStateOpenBackend(void* backend, SStreamState* pState) {
+  qError("start to open backend, %p, %d-%d", pState, pState->streamId, pState->taskId);
+  SBackendHandle* handle = backend;
 
   char* err = NULL;
   int   cfLen = sizeof(ginitDict) / sizeof(ginitDict[0]);
@@ -400,11 +390,10 @@ int streamInitBackend(SStreamState* pState, char* path) {
   rocksdbCfParam*           param = taosMemoryCalloc(cfLen, sizeof(rocksdbCfParam));
   const rocksdb_options_t** cfOpt = taosMemoryCalloc(cfLen, sizeof(rocksdb_options_t*));
   for (int i = 0; i < cfLen; i++) {
-    cfOpt[i] = rocksdb_options_create_copy(opts);
+    cfOpt[i] = rocksdb_options_create();
     // refactor later
     rocksdb_block_based_table_options_t* tableOpt = rocksdb_block_based_options_create();
-    rocksdb_cache_t*                     cache = rocksdb_cache_create_lru(64 << 20);
-    rocksdb_block_based_options_set_block_cache(tableOpt, cache);
+    rocksdb_block_based_options_set_block_cache(tableOpt, handle->cache);
 
     rocksdb_filterpolicy_t* filter = rocksdb_filterpolicy_create_bloom(15);
     rocksdb_block_based_options_set_filter_policy(tableOpt, filter);
@@ -412,73 +401,93 @@ int streamInitBackend(SStreamState* pState, char* path) {
     rocksdb_options_set_block_based_table_factory((rocksdb_options_t*)cfOpt[i], tableOpt);
 
     param[i].tableOpt = tableOpt;
-    param[i].lru = cache;
-    // rocksdb_slicetransform_t* trans = rocksdb_slicetransform_create_fixed_prefix(8);
-    // rocksdb_options_set_prefix_extractor((rocksdb_options_t*)cfOpt[i], trans);
   };
 
   rocksdb_comparator_t** pCompare = taosMemoryCalloc(cfLen, sizeof(rocksdb_comparator_t**));
   for (int i = 0; i < cfLen; i++) {
-    SCfInit*              cf = &ginitDict[i];
+    SCfInit* cf = &ginitDict[i];
+
     rocksdb_comparator_t* compare = rocksdb_comparator_create(NULL, cf->detroyFunc, cf->cmpFunc, cf->cmpName);
     rocksdb_options_set_comparator((rocksdb_options_t*)cfOpt[i], compare);
     pCompare[i] = compare;
   }
-
   rocksdb_column_family_handle_t** cfHandle = taosMemoryMalloc(cfLen * sizeof(rocksdb_column_family_handle_t*));
-  rocksdb_t*                       db = rocksdb_open_column_families(opts, path, cfLen, cfName, cfOpt, cfHandle, &err);
+  for (int i = 0; i < cfLen; i++) {
+    char buf[64] = {0};
+    GEN_COLUMN_FAMILY_NAME(buf, pState->streamId, pState->taskId, ginitDict[i].key);
+    cfHandle[i] = rocksdb_create_column_family(handle->db, cfOpt[i], buf, &err);
+    if (err != NULL) {
+      qError("rocksdb create column family failed, reason:%s", err);
+      taosMemoryFree(err);
+      return -1;
+    }
+  }
 
-  pState->pTdbState->rocksdb = db;
+  pState->pTdbState->rocksdb = handle->db;
   pState->pTdbState->pHandle = cfHandle;
   pState->pTdbState->writeOpts = rocksdb_writeoptions_create();
-  // rocksdb_writeoptions_
-  // rocksdb_writeoptions_set_no_slowdown(pState->pTdbState->writeOpts, 1);
   pState->pTdbState->readOpts = rocksdb_readoptions_create();
   pState->pTdbState->cfOpts = (rocksdb_options_t**)cfOpt;
-  pState->pTdbState->pCompare = pCompare;
-  pState->pTdbState->dbOpt = opts;
+  // pState->pTdbState->pCompare = pCompare;
+  pState->pTdbState->dbOpt = handle->dbOpt;
   pState->pTdbState->param = param;
-  pState->pTdbState->env = env;
+
+  SCfComparator compare = {.comp = pCompare, .numOfComp = cfLen};
+  pState->pTdbState->pComparNode = streamBackendAddCompare(handle, &compare);
+
+  rocksdb_writeoptions_disable_WAL(pState->pTdbState->writeOpts, 1);
+  qError("end to open backend, %p", pState);
   return 0;
 }
-void streamCleanBackend(SStreamState* pState) {
+void streamStateCloseBackend(SStreamState* pState, bool remove) {
+  char* status[] = {"remove", "drop"};
+  qError("start to %s backend, %p, %d-%d", status[remove == false ? 1 : 0], pState, pState->streamId, pState->taskId);
   if (pState->pTdbState->rocksdb == NULL) {
-    qInfo("rocksdb already free");
     return;
   }
 
   int             cfLen = sizeof(ginitDict) / sizeof(ginitDict[0]);
   rocksdbCfParam* param = pState->pTdbState->param;
+
+  char*                   err = NULL;
+  rocksdb_flushoptions_t* flushOpt = rocksdb_flushoptions_create();
+  for (int i = 0; i < cfLen; i++) {
+    if (remove) {
+      rocksdb_drop_column_family(pState->pTdbState->rocksdb, pState->pTdbState->pHandle[i], &err);
+    } else {
+      rocksdb_flush_cf(pState->pTdbState->rocksdb, flushOpt, pState->pTdbState->pHandle[i], &err);
+    }
+  }
+  rocksdb_flushoptions_destroy(flushOpt);
+
   for (int i = 0; i < cfLen; i++) {
     rocksdb_column_family_handle_destroy(pState->pTdbState->pHandle[i]);
   }
   taosMemoryFreeClear(pState->pTdbState->pHandle);
 
-  rocksdb_options_destroy(pState->pTdbState->dbOpt);
-
+  for (int i = 0; i < cfLen; i++) {
+    rocksdb_options_destroy(pState->pTdbState->cfOpts[i]);
+    rocksdb_block_based_options_destroy(param[i].tableOpt);
+  }
+  if (remove) {
+    streamBackendDelCompare(pState->pTdbState->pBackendHandle, pState->pTdbState->pComparNode);
+  }
   rocksdb_writeoptions_destroy(pState->pTdbState->writeOpts);
   pState->pTdbState->writeOpts = NULL;
 
   rocksdb_readoptions_destroy(pState->pTdbState->readOpts);
   pState->pTdbState->readOpts = NULL;
-
-  rocksdb_close(pState->pTdbState->rocksdb);
-  // wait for all background work to finish
-  for (int i = 0; i < cfLen; i++) {
-    rocksdb_options_destroy(pState->pTdbState->cfOpts[i]);
-    rocksdb_comparator_destroy(pState->pTdbState->pCompare[i]);
-
-    rocksdb_cache_destroy(param[i].lru);
-    rocksdb_block_based_options_destroy(param[i].tableOpt);
-  }
   taosMemoryFreeClear(pState->pTdbState->cfOpts);
-  taosMemoryFree(pState->pTdbState->pCompare);
-  taosMemoryFree(pState->pTdbState->param);
-  rocksdb_env_destroy(pState->pTdbState->env);
-
+  taosMemoryFreeClear(pState->pTdbState->param);
   pState->pTdbState->rocksdb = NULL;
 }
-
+void streamStateDestroyCompar(void* arg) {
+  SCfComparator* comp = (SCfComparator*)arg;
+  for (int i = 0; i < comp->numOfComp; i++) {
+    rocksdb_comparator_destroy(comp->comp[i]);
+  }
+  taosMemoryFree(comp->comp);
+}
 int streamGetInit(const char* funcName) {
   size_t len = strlen(funcName);
   for (int i = 0; i < sizeof(ginitDict) / sizeof(ginitDict[0]); i++) {
@@ -1540,7 +1549,7 @@ int32_t streamStateGetParName_rocksdb(SStreamState* pState, int64_t groupId, voi
   return code;
 }
 
-void streamStateDestroy_rocksdb(SStreamState* pState) {
+void streamStateDestroy_rocksdb(SStreamState* pState, bool remove) {
   // only close db
-  streamCleanBackend(pState);
+  streamStateCloseBackend(pState, remove);
 }
\ No newline at end of file
diff --git a/source/libs/stream/src/streamTask.c b/source/libs/stream/src/streamTask.c
index 67c60008fdb98b5f341be5271668a17bd3563c92..97500fe4c86de12e39d5425a370bc118eabbd408 100644
--- a/source/libs/stream/src/streamTask.c
+++ b/source/libs/stream/src/streamTask.c
@@ -27,7 +27,7 @@ SStreamTask* tNewStreamTask(int64_t streamId) {
   pTask->id.streamId = streamId;
 
   char buf[128] = {0};
-  sprintf(buf, "0x%"PRIx64"-%d", pTask->id.streamId, pTask->id.taskId);
+  sprintf(buf, "0x%" PRIx64 "-%d", pTask->id.streamId, pTask->id.taskId);
 
   pTask->id.idStr = taosStrdup(buf);
   pTask->status.schedStatus = TASK_SCHED_STATUS__INACTIVE;
@@ -171,7 +171,7 @@ int32_t tDecodeStreamTask(SDecoder* pDecoder, SStreamTask* pTask) {
 
 void tFreeStreamTask(SStreamTask* pTask) {
   qDebug("free s-task:%s", pTask->id.idStr);
-
+  int32_t status = atomic_load_8((int8_t*)&(pTask->status.taskStatus));
   if (pTask->inputQueue) {
     streamQueueClose(pTask->inputQueue);
   }
@@ -204,10 +204,10 @@ void tFreeStreamTask(SStreamTask* pTask) {
   }
 
   if (pTask->pState) {
-    streamStateClose(pTask->pState);
+    streamStateClose(pTask->pState, status == TASK_STATUS__DROPPING);
   }
 
-  if (pTask->id.idStr != NULL)  {
+  if (pTask->id.idStr != NULL) {
     taosMemoryFree((void*)pTask->id.idStr);
   }
 
diff --git a/source/util/src/tlist.c b/source/util/src/tlist.c
index a89105bb42fea4941a6a08124fb0b9fb6a8fe6d7..db5a214ada1da9f323e7090a7b517a8e9725ae05 100644
--- a/source/util/src/tlist.c
+++ b/source/util/src/tlist.c
@@ -87,6 +87,15 @@ int32_t tdListAppend(SList *list, const void *data) {
 
   return 0;
 }
+// return the node pointer
+SListNode *tdListAdd(SList *list, const void *data) {
+  SListNode *node = (SListNode *)taosMemoryCalloc(1, sizeof(SListNode) + list->eleSize);
+  if (node == NULL) return NULL;
+
+  memcpy((void *)(node->data), data, list->eleSize);
+  TD_DLIST_APPEND(list, node);
+  return node;
+}
 
 SListNode *tdListPopHead(SList *list) {
   SListNode *node;