diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit2.c b/source/dnode/vnode/src/tsdb/tsdbCommit2.c
index c55e5f92ea..79964c5636 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit2.c
@@ -562,6 +562,8 @@ int32_t tsdbCommitBegin(STsdb *tsdb, SCommitInfo *info) {
   } else {
     SCommitter2 committer[1];
 
+    tsdbFSCheckCommit(tsdb->pFS);
+
     code = tsdbOpenCommitter(tsdb, info, committer);
     TSDB_CHECK_CODE(code, lino, _exit);
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbFS2.c b/source/dnode/vnode/src/tsdb/tsdbFS2.c
index 5e5348e9b5..e16eee39e8 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFS2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbFS2.c
@@ -65,11 +65,17 @@ static int32_t create_fs(STsdb *pTsdb, STFileSystem **fs) {
   fs[0]->bgTaskQueue->next = fs[0]->bgTaskQueue;
   fs[0]->bgTaskQueue->prev = fs[0]->bgTaskQueue;
 
+  taosThreadMutexInit(&fs[0]->commitMutex, NULL);
+  taosThreadCondInit(&fs[0]->canCommit, NULL);
+  fs[0]->blockCommit = false;
+
   return 0;
 }
 
 static int32_t destroy_fs(STFileSystem **fs) {
   if (fs[0] == NULL) return 0;
+  taosThreadMutexDestroy(&fs[0]->commitMutex);
+  taosThreadCondDestroy(&fs[0]->canCommit);
   taosThreadMutexDestroy(fs[0]->mutex);
 
   ASSERT(fs[0]->bgTaskNum == 0);
@@ -829,6 +835,27 @@ _exit:
   return code;
 }
 
+static int32_t tsdbFSSetBlockCommit(STFileSystem *fs, bool block) {
+  taosThreadMutexLock(&fs->commitMutex);
+  if (block) {
+    fs->blockCommit = true;
+  } else {
+    fs->blockCommit = false;
+    taosThreadCondSignal(&fs->canCommit);
+  }
+  taosThreadMutexUnlock(&fs->commitMutex);
+  return 0;
+}
+
+int32_t tsdbFSCheckCommit(STFileSystem *fs) {
+  taosThreadMutexLock(&fs->commitMutex);
+  while (fs->blockCommit) {
+    taosThreadCondWait(&fs->canCommit, &fs->commitMutex);
+  }
+  taosThreadMutexUnlock(&fs->commitMutex);
+  return 0;
+}
+
 int32_t tsdbFSEditCommit(STFileSystem *fs) {
   int32_t code = 0;
   int32_t lino = 0;
@@ -838,19 +865,36 @@ int32_t tsdbFSEditCommit(STFileSystem *fs) {
   TSDB_CHECK_CODE(code, lino, _exit);
 
   // schedule merge
-  if (fs->tsdb->pVnode->config.sttTrigger != 1) {
+  if (fs->tsdb->pVnode->config.sttTrigger > 1) {
     STFileSet *fset;
+    int32_t    sttTrigger = fs->tsdb->pVnode->config.sttTrigger;
+    bool       schedMerge = false;
+    bool       blockCommit = false;
+
     TARRAY2_FOREACH_REVERSE(fs->fSetArr, fset) {
       if (TARRAY2_SIZE(fset->lvlArr) == 0) continue;
 
       SSttLvl *lvl = TARRAY2_FIRST(fset->lvlArr);
-      if (lvl->level != 0 || TARRAY2_SIZE(lvl->fobjArr) < fs->tsdb->pVnode->config.sttTrigger) continue;
+      if (lvl->level != 0) continue;
 
+      int32_t numFile = TARRAY2_SIZE(lvl->fobjArr);
+      if (numFile >= sttTrigger) {
+        schedMerge = true;
+      }
+
+      if (numFile >= sttTrigger * 2) {
+        blockCommit = true;
+      }
+
+      if (schedMerge && blockCommit) break;
+    }
+
+    if (schedMerge) {
       code = tsdbFSScheduleBgTask(fs, TSDB_BG_TASK_MERGER, tsdbMerge, NULL, fs->tsdb, NULL);
       TSDB_CHECK_CODE(code, lino, _exit);
-
-      break;
     }
+
+    tsdbFSSetBlockCommit(fs, blockCommit);
   }
 
 _exit:
diff --git a/source/dnode/vnode/src/tsdb/tsdbFS2.h b/source/dnode/vnode/src/tsdb/tsdbFS2.h
index e814ab2fff..b0f42a0c48 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFS2.h
+++ b/source/dnode/vnode/src/tsdb/tsdbFS2.h
@@ -67,6 +67,7 @@ int32_t tsdbFSDisableBgTask(STFileSystem *fs);
 int32_t tsdbFSEnableBgTask(STFileSystem *fs);
 // other
 int32_t tsdbFSGetFSet(STFileSystem *fs, int32_t fid, STFileSet **fset);
+int32_t tsdbFSCheckCommit(STFileSystem *fs);
 
 struct STFSBgTask {
   EFSBgTaskT type;
@@ -103,6 +104,11 @@ struct STFileSystem {
   int32_t       bgTaskNum;
   STFSBgTask    bgTaskQueue[1];
   STFSBgTask   *bgTaskRunning;
+
+  // block commit variables
+  TdThreadMutex commitMutex;
+  TdThreadCond  canCommit;
+  bool          blockCommit;
 };
 
 #ifdef __cplusplus