diff --git a/source/dnode/vnode/src/tsdb/tsdbFS2.c b/source/dnode/vnode/src/tsdb/tsdbFS2.c
index 7fd5432a4e..8e200b67b4 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFS2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbFS2.c
@@ -48,15 +48,23 @@ static int32_t create_fs(STsdb *pTsdb, STFileSystem **fs) {
   tsem_init(&fs[0]->canEdit, 0, 1);
   fs[0]->state = TSDB_FS_STATE_NONE;
   fs[0]->neid = 0;
-  fs[0]->mergeTaskOn = false;
   TARRAY2_INIT(fs[0]->fSetArr);
   TARRAY2_INIT(fs[0]->fSetArrTmp);
 
+  // background task queue
+  taosThreadMutexInit(fs[0]->mutex, NULL);
+  fs[0]->bgTaskQueue->next = fs[0]->bgTaskQueue;
+  fs[0]->bgTaskQueue->prev = fs[0]->bgTaskQueue;
+
   return 0;
 }
 
 static int32_t destroy_fs(STFileSystem **fs) {
   if (fs[0] == NULL) return 0;
+  taosThreadMutexDestroy(fs[0]->mutex);
+
+  ASSERT(fs[0]->bgTaskNum == 0);
+
   TARRAY2_DESTROY(fs[0]->fSetArr, NULL);
   TARRAY2_DESTROY(fs[0]->fSetArrTmp, NULL);
   tsem_destroy(&fs[0]->canEdit);
@@ -595,25 +603,18 @@ int32_t tsdbFSEditCommit(STFileSystem *fs) {
   code = commit_edit(fs);
   TSDB_CHECK_CODE(code, lino, _exit);
 
-  if (fs->etype == TSDB_FEDIT_MERGE) {
-    ASSERT(fs->mergeTaskOn);
-    fs->mergeTaskOn = false;
-  }
-
-  // check if need to merge
-  if (fs->tsdb->pVnode->config.sttTrigger > 1 && fs->mergeTaskOn == false) {
+  // schedule merge
+  if (fs->tsdb->pVnode->config.sttTrigger != 1) {
     STFileSet *fset;
     TARRAY2_FOREACH_REVERSE(fs->fSetArr, fset) {
       if (TARRAY2_SIZE(fset->lvlArr) == 0) continue;
 
-      SSttLvl *lvl0 = TARRAY2_FIRST(fset->lvlArr);
-      if (lvl0->level != 0 || TARRAY2_SIZE(lvl0->fobjArr) < fs->tsdb->pVnode->config.sttTrigger) continue;
+      SSttLvl *lvl = TARRAY2_FIRST(fset->lvlArr);
+      if (lvl->level != 0 || TARRAY2_SIZE(lvl->fobjArr) < fs->tsdb->pVnode->config.sttTrigger) continue;
 
-      code = vnodeScheduleTaskEx(1, tsdbMerge, fs->tsdb);
+      code = tsdbFSScheduleBgTask(fs, TSDB_BG_TASK_MERGER, tsdbMerge, fs->tsdb, NULL);
       TSDB_CHECK_CODE(code, lino, _exit);
 
-      fs->mergeTaskOn = true;
-
       break;
     }
   }
@@ -707,4 +708,136 @@ int32_t tsdbFSDestroyRefSnapshot(TFileSetArray **fsetArr) {
     fsetArr[0] = NULL;
   }
   return 0;
+}
+
+const char *gFSBgTaskName[] = {NULL, "MERGE", "RETENTION", "COMPACT"};
+
+static int32_t tsdbFSRunBgTask(void *arg) {
+  STFileSystem *fs = (STFileSystem *)arg;
+
+  ASSERT(fs->bgTaskRunning != NULL);
+
+  fs->bgTaskRunning->launchTime = taosGetTimestampMs();
+  fs->bgTaskRunning->run(fs->bgTaskRunning->arg);
+  fs->bgTaskRunning->finishTime = taosGetTimestampMs();
+
+  tsdbDebug("vgId:%d bg task:%s task id:%" PRId64 " finished, schedule time:%" PRId64 " launch time:%" PRId64
+            " finish time:%" PRId64,
+            TD_VID(fs->tsdb->pVnode), gFSBgTaskName[fs->bgTaskRunning->type], fs->bgTaskRunning->taskid,
+            fs->bgTaskRunning->scheduleTime, fs->bgTaskRunning->launchTime, fs->bgTaskRunning->finishTime);
+
+  taosThreadMutexLock(fs->mutex);
+
+  // free last
+  if (fs->bgTaskRunning->numWait > 0) {
+    taosThreadCondBroadcast(fs->bgTaskRunning->done);
+  } else {
+    taosThreadCondDestroy(fs->bgTaskRunning->done);
+    taosMemoryFree(fs->bgTaskRunning);
+  }
+  fs->bgTaskRunning = NULL;
+
+  // schedule next
+  if (fs->bgTaskNum > 0) {
+    // pop task from head
+    fs->bgTaskRunning = fs->bgTaskQueue->next;
+    fs->bgTaskRunning->prev->next = fs->bgTaskRunning->next;
+    fs->bgTaskRunning->next->prev = fs->bgTaskRunning->prev;
+    fs->bgTaskNum--;
+
+    vnodeScheduleTaskEx(1, tsdbFSRunBgTask, arg);
+  }
+
+  taosThreadMutexUnlock(fs->mutex);
+  return 0;
+}
+
+static int32_t tsdbFSScheduleBgTaskImpl(STFileSystem *fs, EFSBgTaskT type, int32_t (*run)(void *), void *arg,
+                                        int64_t *taskid) {
+  // check if same task is on
+  if (fs->bgTaskRunning && fs->bgTaskRunning->type == type) {
+    return 0;
+  }
+
+  for (STFSBgTask *task = fs->bgTaskQueue->next; task != fs->bgTaskQueue; task = task->next) {
+    if (task->type == type) {
+      return 0;
+    }
+  }
+
+  // do schedule task
+  STFSBgTask *task = taosMemoryCalloc(1, sizeof(STFSBgTask));
+  if (task == NULL) return TSDB_CODE_OUT_OF_MEMORY;
+  taosThreadCondInit(task->done, NULL);
+
+  task->type = type;
+  task->run = run;
+  task->arg = arg;
+  task->scheduleTime = taosGetTimestampMs();
+  task->taskid = ++fs->taskid;
+
+  if (fs->bgTaskRunning == NULL && fs->bgTaskNum == 0) {
+    // launch task directly
+    fs->bgTaskRunning = task;
+    vnodeScheduleTaskEx(1, tsdbFSRunBgTask, fs);
+  } else {
+    // add to the queue tail
+    fs->bgTaskNum++;
+    task->next = fs->bgTaskQueue;
+    task->prev = fs->bgTaskQueue->prev;
+    task->prev->next = task;
+    task->next->prev = task;
+  }
+
+  if (taskid) *taskid = task->taskid;
+  return 0;
+}
+
+int32_t tsdbFSScheduleBgTask(STFileSystem *fs, EFSBgTaskT type, int32_t (*run)(void *), void *arg, int64_t *taskid) {
+  taosThreadMutexLock(fs->mutex);
+  int32_t code = tsdbFSScheduleBgTaskImpl(fs, type, run, arg, taskid);
+  taosThreadMutexUnlock(fs->mutex);
+  return code;
+}
+
+int32_t tsdbFSWaitBgTask(STFileSystem *fs, int64_t taskid) {
+  STFSBgTask *task = NULL;
+
+  taosThreadMutexLock(fs->mutex);
+
+  if (fs->bgTaskRunning && fs->bgTaskRunning->taskid == taskid) {
+    task = fs->bgTaskRunning;
+  } else {
+    for (STFSBgTask *taskt = fs->bgTaskQueue->next; taskt != fs->bgTaskQueue; taskt = taskt->next) {
+      if (taskt->taskid == taskid) {
+        task = taskt;
+        break;
+      }
+    }
+  }
+
+  if (task) {
+    task->numWait++;
+    taosThreadCondWait(task->done, fs->mutex);
+    task->numWait--;
+
+    if (task->numWait == 0) {
+      taosThreadCondDestroy(task->done);
+      taosMemoryFree(task);
+    }
+  }
+
+  taosThreadMutexUnlock(fs->mutex);
+  return 0;
+}
+
+int32_t tsdbFSWaitAllBgTask(STFileSystem *fs) {
+  taosThreadMutexLock(fs->mutex);
+
+  while (fs->bgTaskRunning) {
+    taosThreadCondWait(fs->bgTaskRunning->done, fs->mutex);
+  }
+
+  taosThreadMutexUnlock(fs->mutex);
+  return 0;
 }
\ No newline at end of file
diff --git a/source/dnode/vnode/src/tsdb/tsdbFS2.h b/source/dnode/vnode/src/tsdb/tsdbFS2.h
index 074ce7c551..36156d0662 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFS2.h
+++ b/source/dnode/vnode/src/tsdb/tsdbFS2.h
@@ -24,6 +24,7 @@ extern "C" {
 
 /* Exposed Handle */
 typedef struct STFileSystem STFileSystem;
+typedef struct STFSBgTask   STFSBgTask;
 typedef TARRAY2(STFileSet *) TFileSetArray;
 
 typedef enum {
@@ -31,6 +32,12 @@ typedef enum {
   TSDB_FEDIT_MERGE
 } EFEditT;
 
+typedef enum {
+  TSDB_BG_TASK_MERGER = 1,
+  TSDB_BG_TASK_RETENTION,
+  TSDB_BG_TASK_COMPACT,
+} EFSBgTaskT;
+
 /* Exposed APIs */
 // open/close
 int32_t tsdbOpenFS(STsdb *pTsdb, STFileSystem **fs, int8_t rollback);
@@ -45,9 +52,30 @@ int64_t tsdbFSAllocEid(STFileSystem *fs);
 int32_t tsdbFSEditBegin(STFileSystem *fs, const TFileOpArray *opArray, EFEditT etype);
 int32_t tsdbFSEditCommit(STFileSystem *fs);
 int32_t tsdbFSEditAbort(STFileSystem *fs);
+// background task
+int32_t tsdbFSScheduleBgTask(STFileSystem *fs, EFSBgTaskT type, int32_t (*run)(void *), void *arg, int64_t *taskid);
+int32_t tsdbFSWaitBgTask(STFileSystem *fs, int64_t taskid);
+int32_t tsdbFSWaitAllBgTask(STFileSystem *fs);
 // other
 int32_t tsdbFSGetFSet(STFileSystem *fs, int32_t fid, STFileSet **fset);
 
+struct STFSBgTask {
+  EFSBgTaskT type;
+  int32_t (*run)(void *arg);
+  void *arg;
+
+  TdThreadCond done[1];
+  int32_t      numWait;
+
+  int64_t taskid;
+  int64_t scheduleTime;
+  int64_t launchTime;
+  int64_t finishTime;
+
+  struct STFSBgTask *prev;
+  struct STFSBgTask *next;
+};
+
 /* Exposed Structs */
 struct STFileSystem {
   STsdb        *tsdb;
@@ -55,9 +83,15 @@ struct STFileSystem {
   int32_t       state;
   int64_t       neid;
   EFEditT       etype;
-  bool          mergeTaskOn;
   TFileSetArray fSetArr[1];
   TFileSetArray fSetArrTmp[1];
+
+  // background task queue
+  TdThreadMutex mutex[1];
+  int64_t       taskid;
+  int32_t       bgTaskNum;
+  STFSBgTask    bgTaskQueue[1];
+  STFSBgTask   *bgTaskRunning;
 };
 
 #ifdef __cplusplus
diff --git a/source/dnode/vnode/src/tsdb/tsdbRetention.c b/source/dnode/vnode/src/tsdb/tsdbRetention.c
index a6b72e38bd..6580b89dad 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRetention.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRetention.c
@@ -16,105 +16,6 @@
 #include "tsdb.h"
 #include "tsdbFS2.h"
 
-static bool tsdbShouldDoRetentionImpl(STsdb *pTsdb, int64_t now) {
-  for (int32_t iSet = 0; iSet < taosArrayGetSize(pTsdb->fs.aDFileSet); iSet++) {
-    SDFileSet *pSet = (SDFileSet *)taosArrayGet(pTsdb->fs.aDFileSet, iSet);
-    int32_t    expLevel = tsdbFidLevel(pSet->fid, &pTsdb->keepCfg, now);
-    SDiskID    did;
-
-    if (expLevel == pSet->diskId.level) continue;
-
-    if (expLevel < 0) {
-      return true;
-    } else {
-      if (tfsAllocDisk(pTsdb->pVnode->pTfs, expLevel, &did) < 0) {
-        return false;
-      }
-
-      if (did.level == pSet->diskId.level) continue;
-
-      return true;
-    }
-  }
-
-  return false;
-}
-bool tsdbShouldDoRetention(STsdb *pTsdb, int64_t now) {
-  bool should;
-  taosThreadRwlockRdlock(&pTsdb->rwLock);
-  should = tsdbShouldDoRetentionImpl(pTsdb, now);
-  taosThreadRwlockUnlock(&pTsdb->rwLock);
-  return should;
-}
-
-int32_t tsdbDoRetention(STsdb *pTsdb, int64_t now) {
-  int32_t code = 0;
-  int32_t lino = 0;
-  STsdbFS fs = {0};
-
-  code = tsdbFSCopy(pTsdb, &fs);
-  TSDB_CHECK_CODE(code, lino, _exit);
-
-  for (int32_t iSet = 0; iSet < taosArrayGetSize(fs.aDFileSet); iSet++) {
-    SDFileSet *pSet = (SDFileSet *)taosArrayGet(fs.aDFileSet, iSet);
-    int32_t    expLevel = tsdbFidLevel(pSet->fid, &pTsdb->keepCfg, now);
-    SDiskID    did;
-
-    if (expLevel < 0) {
-      taosMemoryFree(pSet->pHeadF);
-      taosMemoryFree(pSet->pDataF);
-      taosMemoryFree(pSet->pSmaF);
-      for (int32_t iStt = 0; iStt < pSet->nSttF; iStt++) {
-        taosMemoryFree(pSet->aSttF[iStt]);
-      }
-      taosArrayRemove(fs.aDFileSet, iSet);
-      iSet--;
-    } else {
-      if (expLevel == 0) continue;
-      if (tfsAllocDisk(pTsdb->pVnode->pTfs, expLevel, &did) < 0) {
-        code = terrno;
-        goto _exit;
-      }
-
-      if (did.level == pSet->diskId.level) continue;
-
-      // copy file to new disk (todo)
-      SDFileSet fSet = *pSet;
-      fSet.diskId = did;
-
-      code = tsdbDFileSetCopy(pTsdb, pSet, &fSet);
-      TSDB_CHECK_CODE(code, lino, _exit);
-
-      code = tsdbFSUpsertFSet(&fs, &fSet);
-      TSDB_CHECK_CODE(code, lino, _exit);
-    }
-  }
-
-  // do change fs
-  code = tsdbFSPrepareCommit(pTsdb, &fs);
-  TSDB_CHECK_CODE(code, lino, _exit);
-
-_exit:
-  if (code) {
-    tsdbError("vgId:%d %s failed at line %d since %s", TD_VID(pTsdb->pVnode), __func__, lino, tstrerror(code));
-  } else {
-    tsdbInfo("vgId:%d %s done", TD_VID(pTsdb->pVnode), __func__);
-  }
-  tsdbFSDestroy(&fs);
-  return code;
-}
-
-static int32_t tsdbCommitRetentionImpl(STsdb *pTsdb) { return tsdbFSCommit(pTsdb); }
-
-int32_t tsdbCommitRetention(STsdb *pTsdb) {
-  taosThreadRwlockWrlock(&pTsdb->rwLock);
-  tsdbCommitRetentionImpl(pTsdb);
-  taosThreadRwlockUnlock(&pTsdb->rwLock);
-  tsdbInfo("vgId:%d %s done", TD_VID(pTsdb->pVnode), __func__);
-  return 0;
-}
-
-// new ==============
 typedef struct {
   STsdb  *tsdb;
   int32_t szPage;
@@ -128,19 +29,19 @@ typedef struct {
     int32_t    fsetArrIdx;
     STFileSet *fset;
   } ctx[1];
-} SRTXer;
+} SRTNer;
 
-static int32_t tsdbDoRemoveFileObject(SRTXer *rtxer, const STFileObj *fobj) {
+static int32_t tsdbDoRemoveFileObject(SRTNer *rtner, const STFileObj *fobj) {
   STFileOp op = {
       .optype = TSDB_FOP_REMOVE,
       .fid = fobj->f->fid,
       .of = fobj->f[0],
   };
 
-  return TARRAY2_APPEND(rtxer->fopArr, op);
+  return TARRAY2_APPEND(rtner->fopArr, op);
 }
 
-static int32_t tsdbDoCopyFile(SRTXer *rtxer, const STFileObj *from, const STFile *to) {
+static int32_t tsdbDoCopyFile(SRTNer *rtner, const STFileObj *from, const STFile *to) {
   int32_t code = 0;
   int32_t lino = 0;
 
@@ -148,7 +49,7 @@ static int32_t tsdbDoCopyFile(SRTXer *rtxer, const STFileObj *from, const STFile
   TdFilePtr fdFrom = NULL;
   TdFilePtr fdTo = NULL;
 
-  tsdbTFileName(rtxer->tsdb, to, fname);
+  tsdbTFileName(rtner->tsdb, to, fname);
 
   fdFrom = taosOpenFile(from->fname, TD_FILE_READ);
   if (fdFrom == NULL) code = terrno;
@@ -158,7 +59,7 @@ static int32_t tsdbDoCopyFile(SRTXer *rtxer, const STFileObj *from, const STFile
   if (fdTo == NULL) code = terrno;
   TSDB_CHECK_CODE(code, lino, _exit);
 
-  int64_t n = taosFSendFile(fdTo, fdFrom, 0, tsdbLogicToFileSize(from->f->size, rtxer->szPage));
+  int64_t n = taosFSendFile(fdTo, fdFrom, 0, tsdbLogicToFileSize(from->f->size, rtner->szPage));
   if (n < 0) {
     code = TAOS_SYSTEM_ERROR(errno);
     TSDB_CHECK_CODE(code, lino, _exit);
@@ -168,14 +69,14 @@ static int32_t tsdbDoCopyFile(SRTXer *rtxer, const STFileObj *from, const STFile
 
 _exit:
   if (code) {
-    TSDB_ERROR_LOG(TD_VID(rtxer->tsdb->pVnode), lino, code);
+    TSDB_ERROR_LOG(TD_VID(rtner->tsdb->pVnode), lino, code);
     taosCloseFile(&fdFrom);
     taosCloseFile(&fdTo);
   }
   return code;
 }
 
-static int32_t tsdbDoMigrateFileObj(SRTXer *rtxer, const STFileObj *fobj, const SDiskID *did) {
+static int32_t tsdbDoMigrateFileObj(SRTNer *rtner, const STFileObj *fobj, const SDiskID *did) {
   int32_t  code = 0;
   int32_t  lino = 0;
   STFileOp op = {0};
@@ -187,7 +88,7 @@ static int32_t tsdbDoMigrateFileObj(SRTXer *rtxer, const STFileObj *fobj, const
       .of = fobj->f[0],
   };
 
-  code = TARRAY2_APPEND(rtxer->fopArr, op);
+  code = TARRAY2_APPEND(rtner->fopArr, op);
   TSDB_CHECK_CODE(code, lino, _exit);
 
   // create new
@@ -199,7 +100,7 @@ static int32_t tsdbDoMigrateFileObj(SRTXer *rtxer, const STFileObj *fobj, const
               .type = fobj->f->type,
               .did = did[0],
               .fid = fobj->f->fid,
-              .cid = rtxer->cid,
+              .cid = rtner->cid,
               .size = fobj->f->size,
               .stt[0] =
                   {
@@ -208,101 +109,105 @@ static int32_t tsdbDoMigrateFileObj(SRTXer *rtxer, const STFileObj *fobj, const
           },
   };
 
-  code = TARRAY2_APPEND(rtxer->fopArr, op);
+  code = TARRAY2_APPEND(rtner->fopArr, op);
   TSDB_CHECK_CODE(code, lino, _exit);
 
   // do copy the file
-  code = tsdbDoCopyFile(rtxer, fobj, &op.nf);
+  code = tsdbDoCopyFile(rtner, fobj, &op.nf);
   TSDB_CHECK_CODE(code, lino, _exit);
 
 _exit:
   if (code) {
-    TSDB_ERROR_LOG(TD_VID(rtxer->tsdb->pVnode), lino, code);
+    TSDB_ERROR_LOG(TD_VID(rtner->tsdb->pVnode), lino, code);
   }
   return code;
 }
 
-static int32_t tsdbDoRetentionBegin(STsdb *tsdb, SRTXer *rtxer) {
+typedef struct {
+  STsdb  *tsdb;
+  int64_t now;
+} SRtnArg;
+
+static int32_t tsdbDoRetentionBegin(SRtnArg *arg, SRTNer *rtner) {
   int32_t code = 0;
   int32_t lino = 0;
 
-  // TODO: wait for merge and compact task done
+  STsdb *tsdb = arg->tsdb;
 
-  rtxer->tsdb = tsdb;
-  rtxer->szPage = tsdb->pVnode->config.tsdbPageSize;
-  rtxer->now = taosGetTimestampMs();
-  rtxer->cid = tsdbFSAllocEid(tsdb->pFS);
+  rtner->tsdb = tsdb;
+  rtner->szPage = tsdb->pVnode->config.tsdbPageSize;
+  rtner->now = arg->now;
+  rtner->cid = tsdbFSAllocEid(tsdb->pFS);
 
-  code = tsdbFSCreateCopySnapshot(tsdb->pFS, &rtxer->fsetArr);
+  code = tsdbFSCreateCopySnapshot(tsdb->pFS, &rtner->fsetArr);
   TSDB_CHECK_CODE(code, lino, _exit);
 
 _exit:
   if (code) {
-    TSDB_ERROR_LOG(TD_VID(rtxer->tsdb->pVnode), lino, code);
+    TSDB_ERROR_LOG(TD_VID(rtner->tsdb->pVnode), lino, code);
   } else {
-    tsdbInfo("vid:%d, cid:%" PRId64 ", %s done", TD_VID(rtxer->tsdb->pVnode), rtxer->cid, __func__);
+    tsdbInfo("vid:%d, cid:%" PRId64 ", %s done", TD_VID(rtner->tsdb->pVnode), rtner->cid, __func__);
   }
   return code;
 }
 
-static int32_t tsdbDoRetentionEnd(SRTXer *rtxer) {
+static int32_t tsdbDoRetentionEnd(SRTNer *rtner) {
   int32_t code = 0;
   int32_t lino = 0;
 
-  if (TARRAY2_SIZE(rtxer->fopArr) == 0) goto _exit;
+  if (TARRAY2_SIZE(rtner->fopArr) == 0) goto _exit;
 
-  code = tsdbFSEditBegin(rtxer->tsdb->pFS, rtxer->fopArr, TSDB_FEDIT_MERGE);
+  code = tsdbFSEditBegin(rtner->tsdb->pFS, rtner->fopArr, TSDB_FEDIT_MERGE);
   TSDB_CHECK_CODE(code, lino, _exit);
 
-  taosThreadRwlockWrlock(&rtxer->tsdb->rwLock);
+  taosThreadRwlockWrlock(&rtner->tsdb->rwLock);
 
-  code = tsdbFSEditCommit(rtxer->tsdb->pFS);
+  code = tsdbFSEditCommit(rtner->tsdb->pFS);
   if (code) {
-    taosThreadRwlockUnlock(&rtxer->tsdb->rwLock);
+    taosThreadRwlockUnlock(&rtner->tsdb->rwLock);
     TSDB_CHECK_CODE(code, lino, _exit);
   }
 
-  taosThreadRwlockUnlock(&rtxer->tsdb->rwLock);
+  taosThreadRwlockUnlock(&rtner->tsdb->rwLock);
 
-  TARRAY2_DESTROY(rtxer->fopArr, NULL);
-  tsdbFSDestroyCopySnapshot(&rtxer->fsetArr);
+  TARRAY2_DESTROY(rtner->fopArr, NULL);
+  tsdbFSDestroyCopySnapshot(&rtner->fsetArr);
 
 _exit:
   if (code) {
-    TSDB_ERROR_LOG(TD_VID(rtxer->tsdb->pVnode), lino, code);
+    TSDB_ERROR_LOG(TD_VID(rtner->tsdb->pVnode), lino, code);
   } else {
-    tsdbInfo("vid:%d, cid:%" PRId64 ", %s done", TD_VID(rtxer->tsdb->pVnode), rtxer->cid, __func__);
+    tsdbInfo("vid:%d, cid:%" PRId64 ", %s done", TD_VID(rtner->tsdb->pVnode), rtner->cid, __func__);
   }
   return code;
 }
 
-static int32_t tsdbDoRetention2(STsdb *tsdb) {
+static int32_t tsdbDoRetention2(void *arg) {
   int32_t code = 0;
   int32_t lino = 0;
+  SRTNer  rtner[1] = {0};
 
-  SRTXer rtxer[1] = {0};
-
-  code = tsdbDoRetentionBegin(tsdb, rtxer);
+  code = tsdbDoRetentionBegin(arg, rtner);
   TSDB_CHECK_CODE(code, lino, _exit);
 
-  while (rtxer->ctx->fsetArrIdx < TARRAY2_SIZE(rtxer->fsetArr)) {
-    rtxer->ctx->fset = TARRAY2_GET(rtxer->fsetArr, rtxer->ctx->fsetArrIdx);
+  while (rtner->ctx->fsetArrIdx < TARRAY2_SIZE(rtner->fsetArr)) {
+    rtner->ctx->fset = TARRAY2_GET(rtner->fsetArr, rtner->ctx->fsetArrIdx);
 
     STFileObj *fobj;
-    int32_t    expLevel = tsdbFidLevel(rtxer->ctx->fset->fid, &rtxer->tsdb->keepCfg, rtxer->now);
+    int32_t    expLevel = tsdbFidLevel(rtner->ctx->fset->fid, &rtner->tsdb->keepCfg, rtner->now);
 
     if (expLevel < 0) {  // remove the file set
-      for (int32_t ftype = 0; (ftype < TSDB_FTYPE_MAX) && (fobj = rtxer->ctx->fset->farr[ftype], 1); ++ftype) {
+      for (int32_t ftype = 0; (ftype < TSDB_FTYPE_MAX) && (fobj = rtner->ctx->fset->farr[ftype], 1); ++ftype) {
         if (fobj == NULL) continue;
 
-        code = tsdbDoRemoveFileObject(rtxer, fobj);
+        code = tsdbDoRemoveFileObject(rtner, fobj);
         TSDB_CHECK_CODE(code, lino, _exit);
       }
 
       SSttLvl *lvl;
-      TARRAY2_FOREACH(rtxer->ctx->fset->lvlArr, lvl) {
+      TARRAY2_FOREACH(rtner->ctx->fset->lvlArr, lvl) {
         TARRAY2_FOREACH(lvl->fobjArr, fobj) {
-          code = tsdbDoRemoveFileObject(rtxer, fobj);
+          code = tsdbDoRemoveFileObject(rtner, fobj);
           TSDB_CHECK_CODE(code, lino, _exit);
         }
       }
@@ -311,39 +216,62 @@ static int32_t tsdbDoRetention2(STsdb *tsdb) {
     } else {
       SDiskID did;
 
-      if (tfsAllocDisk(rtxer->tsdb->pVnode->pTfs, expLevel, &did) < 0) {
+      if (tfsAllocDisk(rtner->tsdb->pVnode->pTfs, expLevel, &did) < 0) {
         code = terrno;
         TSDB_CHECK_CODE(code, lino, _exit);
       }
 
       // data
-      for (int32_t ftype = 0; ftype < TSDB_FTYPE_MAX && (fobj = rtxer->ctx->fset->farr[ftype], 1); ++ftype) {
+      for (int32_t ftype = 0; ftype < TSDB_FTYPE_MAX && (fobj = rtner->ctx->fset->farr[ftype], 1); ++ftype) {
         if (fobj == NULL) continue;
 
         if (fobj->f->did.level == did.level) continue;
-        code = tsdbDoMigrateFileObj(rtxer, fobj, &did);
+        code = tsdbDoMigrateFileObj(rtner, fobj, &did);
         TSDB_CHECK_CODE(code, lino, _exit);
       }
 
       // stt
       SSttLvl *lvl;
-      TARRAY2_FOREACH(rtxer->ctx->fset->lvlArr, lvl) {
+      TARRAY2_FOREACH(rtner->ctx->fset->lvlArr, lvl) {
         TARRAY2_FOREACH(lvl->fobjArr, fobj) {
           if (fobj->f->did.level == did.level) continue;
 
-          code = tsdbDoMigrateFileObj(rtxer, fobj, &did);
+          code = tsdbDoMigrateFileObj(rtner, fobj, &did);
           TSDB_CHECK_CODE(code, lino, _exit);
         }
       }
     }
   }
 
-  code = tsdbDoRetentionEnd(rtxer);
+  code = tsdbDoRetentionEnd(rtner);
   TSDB_CHECK_CODE(code, lino, _exit);
 
 _exit:
   if (code) {
-    TSDB_ERROR_LOG(TD_VID(rtxer->tsdb->pVnode), lino, code);
+    TSDB_ERROR_LOG(TD_VID(rtner->tsdb->pVnode), lino, code);
   }
+  taosMemoryFree(arg);
   return code;
 }
+
+int32_t tsdbAsyncRetention(STsdb *tsdb, int64_t now, int64_t *taskid) {
+  SRtnArg *arg = taosMemoryMalloc(sizeof(*arg));
+  if (arg == NULL) return TSDB_CODE_OUT_OF_MEMORY;
+
+  arg->tsdb = tsdb;
+  arg->now = now;
+
+  int32_t code = tsdbFSScheduleBgTask(tsdb->pFS, TSDB_BG_TASK_RETENTION, tsdbDoRetention2, arg, taskid);
+  if (code) taosMemoryFree(arg);
+
+  return code;
+}
+
+int32_t tsdbSyncRetention(STsdb *tsdb, int64_t now) {
+  int64_t taskid;
+
+  int32_t code = tsdbAsyncRetention(tsdb, now, &taskid);
+  if (code) return code;
+
+  return tsdbFSWaitBgTask(tsdb->pFS, taskid);
+}
\ No newline at end of file
diff --git a/source/dnode/vnode/src/tsdb/tsdbUtil.c b/source/dnode/vnode/src/tsdb/tsdbUtil.c
index e526d67f3c..84671197d8 100644
--- a/source/dnode/vnode/src/tsdb/tsdbUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbUtil.c
@@ -528,25 +528,25 @@ void tsdbFidKeyRange(int32_t fid, int32_t minutes, int8_t precision, TSKEY *minK
   *maxKey = *minKey + tsTickPerMin[precision] * minutes - 1;
 }
 
-int32_t tsdbFidLevel(int32_t fid, STsdbKeepCfg *pKeepCfg, int64_t now) {
+int32_t tsdbFidLevel(int32_t fid, STsdbKeepCfg *pKeepCfg, int64_t nowSec) {
   int32_t aFid[3];
   TSKEY   key;
 
   if (pKeepCfg->precision == TSDB_TIME_PRECISION_MILLI) {
-    now = now * 1000;
+    nowSec = nowSec * 1000;
   } else if (pKeepCfg->precision == TSDB_TIME_PRECISION_MICRO) {
-    now = now * 1000000l;
+    nowSec = nowSec * 1000000l;
   } else if (pKeepCfg->precision == TSDB_TIME_PRECISION_NANO) {
-    now = now * 1000000000l;
+    nowSec = nowSec * 1000000000l;
   } else {
     ASSERT(0);
   }
 
-  key = now - pKeepCfg->keep0 * tsTickPerMin[pKeepCfg->precision];
+  key = nowSec - pKeepCfg->keep0 * tsTickPerMin[pKeepCfg->precision];
   aFid[0] = tsdbKeyFid(key, pKeepCfg->days, pKeepCfg->precision);
-  key = now - pKeepCfg->keep1 * tsTickPerMin[pKeepCfg->precision];
+  key = nowSec - pKeepCfg->keep1 * tsTickPerMin[pKeepCfg->precision];
   aFid[1] = tsdbKeyFid(key, pKeepCfg->days, pKeepCfg->precision);
-  key = now - pKeepCfg->keep2 * tsTickPerMin[pKeepCfg->precision];
+  key = nowSec - pKeepCfg->keep2 * tsTickPerMin[pKeepCfg->precision];
   aFid[2] = tsdbKeyFid(key, pKeepCfg->days, pKeepCfg->precision);
 
   if (fid >= aFid[0]) {
diff --git a/source/dnode/vnode/src/vnd/vnodeRetention.c b/source/dnode/vnode/src/vnd/vnodeRetention.c
index 170deb4286..43b071a48f 100644
--- a/source/dnode/vnode/src/vnd/vnodeRetention.c
+++ b/source/dnode/vnode/src/vnd/vnodeRetention.c
@@ -15,116 +15,16 @@
 
 #include "vnd.h"
 
-typedef struct {
-  SVnode    *pVnode;
-  int64_t    now;
-  int64_t    commitID;
-  SVnodeInfo info;
-} SRetentionInfo;
+extern int32_t tsdbSyncRetention(STsdb *tsdb, int64_t now);
 
-extern bool    tsdbShouldDoRetention(STsdb *pTsdb, int64_t now);
-extern int32_t tsdbDoRetention(STsdb *pTsdb, int64_t now);
-extern int32_t tsdbCommitRetention(STsdb *pTsdb);
-
-static int32_t vnodePrepareRentention(SVnode *pVnode, SRetentionInfo *pInfo) {
-  int32_t code = 0;
-  int32_t lino = 0;
-
-  tsem_wait(&pVnode->canCommit);
-
-  pInfo->commitID = ++pVnode->state.commitID;
-
-  char dir[TSDB_FILENAME_LEN] = {0};
-  if (pVnode->pTfs) {
-    snprintf(dir, TSDB_FILENAME_LEN, "%s%s%s", tfsGetPrimaryPath(pVnode->pTfs), TD_DIRSEP, pVnode->path);
-  } else {
-    snprintf(dir, TSDB_FILENAME_LEN, "%s", pVnode->path);
-  }
-
-  if (vnodeLoadInfo(dir, &pInfo->info) < 0) {
-    code = terrno;
-    TSDB_CHECK_CODE(code, lino, _exit);
-  }
-
-_exit:
-  if (code) {
-    vError("vgId:%d %s failed at line %d since %s", TD_VID(pVnode), __func__, lino, tstrerror(code));
+int32_t vnodeSyncRetention(SVnode *pVnode, int64_t now) {
+  int32_t code;
+  if (pVnode->config.sttTrigger == 1) {
+    tsem_wait(&pVnode->canCommit);
+    code = tsdbSyncRetention(pVnode->pTsdb, now);
     tsem_post(&pVnode->canCommit);
   } else {
-    vInfo("vgId:%d %s done", TD_VID(pVnode), __func__);
+    code = tsdbSyncRetention(pVnode->pTsdb, now);
   }
   return code;
 }
-
-static int32_t vnodeRetentionTask(void *param) {
-  int32_t code = 0;
-  int32_t lino = 0;
-
-  SRetentionInfo *pInfo = (SRetentionInfo *)param;
-  SVnode         *pVnode = pInfo->pVnode;
-  char            dir[TSDB_FILENAME_LEN] = {0};
-
-  if (pVnode->pTfs) {
-    snprintf(dir, TSDB_FILENAME_LEN, "%s%s%s", tfsGetPrimaryPath(pVnode->pTfs), TD_DIRSEP, pVnode->path);
-  } else {
-    snprintf(dir, TSDB_FILENAME_LEN, "%s", pVnode->path);
-  }
-
-  // save info
-  pInfo->info.state.commitID = pInfo->commitID;
-
-  if (vnodeSaveInfo(dir, &pInfo->info) < 0) {
-    code = terrno;
-    TSDB_CHECK_CODE(code, lino, _exit);
-  }
-
-  // do job
-  code = tsdbDoRetention(pInfo->pVnode->pTsdb, pInfo->now);
-  TSDB_CHECK_CODE(code, lino, _exit);
-
-  // commit info
-  vnodeCommitInfo(dir);
-
-  // commit sub-job
-  tsdbCommitRetention(pVnode->pTsdb);
-
-_exit:
-  if (code) {
-    vError("vgId:%d %s failed at line %d since %s", TD_VID(pInfo->pVnode), __func__, lino, tstrerror(code));
-  } else {
-    vInfo("vgId:%d %s done", TD_VID(pInfo->pVnode), __func__);
-  }
-  tsem_post(&pInfo->pVnode->canCommit);
-  taosMemoryFree(pInfo);
-  return code;
-}
-
-int32_t vnodeAsyncRentention(SVnode *pVnode, int64_t now) {
-  int32_t code = 0;
-  int32_t lino = 0;
-
-  if (!tsdbShouldDoRetention(pVnode->pTsdb, now)) return code;
-
-  SRetentionInfo *pInfo = (SRetentionInfo *)taosMemoryCalloc(1, sizeof(*pInfo));
-  if (pInfo == NULL) {
-    code = TSDB_CODE_OUT_OF_MEMORY;
-    TSDB_CHECK_CODE(code, lino, _exit);
-  }
-
-  pInfo->pVnode = pVnode;
-  pInfo->now = now;
-
-  code = vnodePrepareRentention(pVnode, pInfo);
-  TSDB_CHECK_CODE(code, lino, _exit);
-
-  vnodeScheduleTask(vnodeRetentionTask, pInfo);
-
-_exit:
-  if (code) {
-    vError("vgId:%d %s failed at line %d since %s", TD_VID(pInfo->pVnode), __func__, lino, tstrerror(code));
-    if (pInfo) taosMemoryFree(pInfo);
-  } else {
-    vInfo("vgId:%d %s done", TD_VID(pInfo->pVnode), __func__);
-  }
-  return 0;
-}
\ No newline at end of file
diff --git a/source/dnode/vnode/src/vnd/vnodeSvr.c b/source/dnode/vnode/src/vnd/vnodeSvr.c
index 5f866dee69..7efcd0b2c6 100644
--- a/source/dnode/vnode/src/vnd/vnodeSvr.c
+++ b/source/dnode/vnode/src/vnd/vnodeSvr.c
@@ -509,7 +509,9 @@ int32_t vnodePreprocessQueryMsg(SVnode *pVnode, SRpcMsg *pMsg) {
 
 int32_t vnodeProcessQueryMsg(SVnode *pVnode, SRpcMsg *pMsg) {
   vTrace("message in vnode query queue is processing");
-  if ((pMsg->msgType == TDMT_SCH_QUERY || pMsg->msgType == TDMT_VND_TMQ_CONSUME || pMsg->msgType == TDMT_VND_TMQ_CONSUME_PUSH) && !syncIsReadyForRead(pVnode->sync)) {
+  if ((pMsg->msgType == TDMT_SCH_QUERY || pMsg->msgType == TDMT_VND_TMQ_CONSUME ||
+       pMsg->msgType == TDMT_VND_TMQ_CONSUME_PUSH) &&
+      !syncIsReadyForRead(pVnode->sync)) {
     vnodeRedirectRpcMsg(pVnode, pMsg, terrno);
     return 0;
   }
@@ -565,8 +567,8 @@ int32_t vnodeProcessFetchMsg(SVnode *pVnode, SRpcMsg *pMsg, SQueueInfo *pInfo) {
       return vnodeGetTableCfg(pVnode, pMsg, true);
     case TDMT_VND_BATCH_META:
       return vnodeGetBatchMeta(pVnode, pMsg);
-//    case TDMT_VND_TMQ_CONSUME:
-//      return tqProcessPollReq(pVnode->pTq, pMsg);
+      //    case TDMT_VND_TMQ_CONSUME:
+      //      return tqProcessPollReq(pVnode->pTq, pMsg);
     case TDMT_VND_TMQ_VG_WALINFO:
       return tqProcessVgWalInfoReq(pVnode->pTq, pMsg);
     case TDMT_STREAM_TASK_RUN:
@@ -609,7 +611,9 @@ void vnodeUpdateMetaRsp(SVnode *pVnode, STableMetaRsp *pMetaRsp) {
   pMetaRsp->precision = pVnode->config.tsdbCfg.precision;
 }
 
-extern int32_t vnodeAsyncRentention(SVnode *pVnode, int64_t now);
+extern int32_t vnodeAsyncRetention(SVnode *pVnode, int64_t now);
+extern int32_t vnodeSyncRetention(SVnode *pVnode, int64_t now);
+
 static int32_t vnodeProcessTrimReq(SVnode *pVnode, int64_t ver, void *pReq, int32_t len, SRpcMsg *pRsp) {
   int32_t     code = 0;
   SVTrimDbReq trimReq = {0};
@@ -622,10 +626,7 @@ static int32_t vnodeProcessTrimReq(SVnode *pVnode, int64_t ver, void *pReq, int3
 
   vInfo("vgId:%d, trim vnode request will be processed, time:%d", pVnode->config.vgId, trimReq.timestamp);
 
-  // process
-  vnodeAsyncRentention(pVnode, trimReq.timestamp);
-  tsem_wait(&pVnode->canCommit);
-  tsem_post(&pVnode->canCommit);
+  code = vnodeSyncRetention(pVnode, trimReq.timestamp);
 
 _exit:
   return code;
@@ -650,7 +651,7 @@ static int32_t vnodeProcessDropTtlTbReq(SVnode *pVnode, int64_t ver, void *pReq,
     tqUpdateTbUidList(pVnode->pTq, tbUids, false);
   }
 
-  vnodeAsyncRentention(pVnode, ttlReq.timestamp);
+  vnodeSyncRetention(pVnode, ttlReq.timestamp);
 
 end:
   taosArrayDestroy(tbUids);