diff --git a/src/storage/compaction/ob_medium_compaction_func.cpp b/src/storage/compaction/ob_medium_compaction_func.cpp
index 71a481fe77..749e77361f 100755
--- a/src/storage/compaction/ob_medium_compaction_func.cpp
+++ b/src/storage/compaction/ob_medium_compaction_func.cpp
@@ -63,7 +63,7 @@ int ObMediumCompactionScheduleFunc::choose_medium_snapshot(
     ObLS &ls,
     ObTablet &tablet,
     const ObAdaptiveMergePolicy::AdaptiveMergeReason &merge_reason,
-    ObIAllocator &allocator,
+    ObArenaAllocator &allocator,
     ObMediumCompactionInfo &medium_info,
     ObGetMergeTablesResult &result,
     int64_t &schema_version)
@@ -95,7 +95,7 @@ int ObMediumCompactionScheduleFunc::choose_major_snapshot(
     ObLS &ls,
     ObTablet &tablet,
     const ObAdaptiveMergePolicy::AdaptiveMergeReason &merge_reason,
-    ObIAllocator &allocator,
+    ObArenaAllocator &allocator,
     ObMediumCompactionInfo &medium_info,
     ObGetMergeTablesResult &result,
     int64_t &schema_version)
@@ -130,6 +130,8 @@ int ObMediumCompactionScheduleFunc::choose_major_snapshot(
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("failed to get schema service from MTL", K(ret));
   }
+
+  bool schedule_medium_merge = false;
   while (OB_SUCC(ret)) {
     if (OB_FAIL(MTL_CALL_FREEZE_INFO_MGR(get_freeze_info_behind_snapshot_version, schedule_snapshot, freeze_info))) {
       if (OB_ENTRY_NOT_EXIST != ret) {
@@ -141,9 +143,10 @@ int ObMediumCompactionScheduleFunc::choose_major_snapshot(
       ret = OB_ERR_UNEXPECTED;
       LOG_WARN("schema version is invalid", K(ret), K(ls_id), K(tablet_id), K(freeze_info));
     } else if (OB_UNLIKELY(freeze_info.schema_version < last_sstable_schema_version)) {
-      ret = OB_ERR_UNEXPECTED;
-      LOG_ERROR("schema version in freeze info is less than last sstable", K(ret), K(ls_id), K(tablet_id),
-        K(freeze_info), K(last_sstable_schema_version));
+      schedule_medium_merge = true;
+      FLOG_INFO("schema version in freeze info is too small, try to schedule medium compaction instead", K(ret),
+                K(ls_id), K(tablet_id), K(last_sstable_schema_version), K(freeze_info));
+      break;
     } else if (OB_FAIL(get_table_schema_to_merge(
         *schema_service, tablet, freeze_info.schema_version, allocator, medium_info))) {
       if (OB_TABLE_IS_DELETED == ret) {
@@ -167,18 +170,53 @@ int ObMediumCompactionScheduleFunc::choose_major_snapshot(
       break;
     }
   } // end of while
-  if (OB_SUCC(ret)) {
+
+  if (OB_FAIL(ret)) {
+  } else if (schedule_medium_merge) {
+    if (OB_FAIL(switch_to_choose_medium_snapshot(allocator, ls, tablet, freeze_info.freeze_version, medium_info, schema_version))) {
+      if (OB_EAGAIN != ret) {
+        LOG_WARN("failed to switch to choose medium snapshot", K(ret), K(tablet));
+      }
+    }
+  } else {
     medium_info.compaction_type_ = ObMediumCompactionInfo::MAJOR_COMPACTION;
     medium_info.medium_merge_reason_ = ObAdaptiveMergePolicy::AdaptiveMergeReason::NONE;
     medium_info.medium_snapshot_ = freeze_info.freeze_version;
     schema_version = freeze_info.schema_version;
-    if (OB_FAIL(get_result_for_major(tablet, medium_info, result))) {
-      LOG_WARN("failed get result for major", K(ret), K(medium_info));
-    } else {
-      LOG_TRACE("choose_major_snapshot", K(ret), "ls_id", ls.get_ls_id(),
-        "tablet_id", tablet.get_tablet_meta().tablet_id_, K(medium_info), K(freeze_info), K(result),
-        K(last_sstable_schema_version));
-    }
+  }
+
+  if (FAILEDx(get_result_for_major(tablet, medium_info, result))) {
+    LOG_WARN("failed get result for major", K(ret), K(medium_info));
+  } else {
+    LOG_TRACE("choose_major_snapshot", K(ret), "ls_id", ls.get_ls_id(),
+      "tablet_id", tablet.get_tablet_meta().tablet_id_, K(medium_info), K(freeze_info), K(result),
+      K(last_sstable_schema_version));
+  }
+  return ret;
+}
+
+int ObMediumCompactionScheduleFunc::switch_to_choose_medium_snapshot(
+    ObArenaAllocator &allocator,
+    ObLS &ls,
+    ObTablet &tablet,
+    const int64_t freeze_version,
+    ObMediumCompactionInfo &medium_info,
+    int64_t &schema_version)
+{
+  int ret = OB_SUCCESS;
+  const int64_t ls_weak_read_ts = ls.get_ls_wrs_handler()->get_ls_weak_read_ts().get_val_for_tx();
+  int64_t medium_snapshot = 0;
+
+  if (ls_weak_read_ts < freeze_version + 1) {
+    ret = OB_EAGAIN;
+    LOG_WARN("weak read ts is smaller than new medium snapshot, try later", K(ret), K(tablet));
+  } else if (FALSE_IT(medium_snapshot = MAX(ls_weak_read_ts, freeze_version + 1))) {
+  } else if (OB_FAIL(choose_medium_schema_version(allocator, medium_snapshot, tablet, schema_version))) {
+    LOG_WARN("fail to choose medium schema version", K(ret), K(tablet));
+  } else {
+    medium_info.compaction_type_ = ObMediumCompactionInfo::MEDIUM_COMPACTION;
+    medium_info.medium_merge_reason_ = ObAdaptiveMergePolicy::AdaptiveMergeReason::NONE;
+    medium_info.medium_snapshot_ = medium_snapshot;
   }
   return ret;
 }
@@ -374,7 +412,8 @@ int ObMediumCompactionScheduleFunc::choose_new_medium_snapshot(
 }
 
 int ObMediumCompactionScheduleFunc::choose_medium_schema_version(
-    const ObMediumCompactionInfo &medium_info,
+    common::ObArenaAllocator &allocator,
+    const int64_t medium_snapshot,
     ObTablet &tablet,
     int64_t &schema_version)
 {
@@ -384,10 +423,10 @@ int ObMediumCompactionScheduleFunc::choose_medium_schema_version(
   int64_t store_column_cnt_in_schema = 0;
   ObSEArray<storage::ObITable *, MAX_MEMSTORE_CNT> memtables;
 
-  if (OB_FAIL(tablet.load_storage_schema(allocator_, schema_on_tablet))) {
+  if (OB_FAIL(tablet.load_storage_schema(allocator, schema_on_tablet))) {
     LOG_WARN("fail to load storage schema", K(ret));
   } else if (FALSE_IT(schema_version = schema_on_tablet->schema_version_)) {
-  } else if (medium_info.medium_snapshot_ <= tablet_snapshot_version) {
+  } else if (medium_snapshot <= tablet_snapshot_version) {
     // do nothing, use schema version on tablet
   } else if (OB_FAIL(schema_on_tablet->get_store_column_count(store_column_cnt_in_schema, true/*full_col*/))) {
     LOG_WARN("failed to get store column count", K(ret), K(store_column_cnt_in_schema));
@@ -463,7 +502,7 @@ int ObMediumCompactionScheduleFunc::decide_medium_snapshot(
           OB_FAIL(choose_new_medium_snapshot(max_reserved_snapshot, medium_info, result))) {
         // chosen medium snapshot is far too old
         LOG_WARN("failed to choose new medium snapshot", KR(ret), K(max_reserved_snapshot), K(medium_info));
-      } else if (OB_FAIL(choose_medium_schema_version(medium_info, *tablet, schema_version))) {
+      } else if (OB_FAIL(choose_medium_schema_version(allocator_, medium_info.medium_snapshot_, *tablet, schema_version))) {
         LOG_WARN("failed to choose medium schema version", K(ret), K(tablet));
       }
 
diff --git a/src/storage/compaction/ob_medium_compaction_func.h b/src/storage/compaction/ob_medium_compaction_func.h
index 8c2d92d6bc..370d284ae7 100755
--- a/src/storage/compaction/ob_medium_compaction_func.h
+++ b/src/storage/compaction/ob_medium_compaction_func.h
@@ -99,7 +99,7 @@ protected:
       ObLS &ls,
       ObTablet &tablet,
       const ObAdaptiveMergePolicy::AdaptiveMergeReason &merge_reason,
-      ObIAllocator &allocator,
+      ObArenaAllocator &allocator,
       ObMediumCompactionInfo &medium_info,
       ObGetMergeTablesResult &result,
       int64_t &schema_version);
@@ -107,10 +107,18 @@ protected:
       ObLS &ls,
       ObTablet &tablet,
       const ObAdaptiveMergePolicy::AdaptiveMergeReason &merge_reason,
-      ObIAllocator &allocator,
+      ObArenaAllocator &allocator,
       ObMediumCompactionInfo &medium_info,
       ObGetMergeTablesResult &result,
       int64_t &schema_version);
+  static int switch_to_choose_medium_snapshot(
+    ObArenaAllocator &allocator,
+    ObLS &ls,
+    ObTablet &tablet,
+    const int64_t freeze_version,
+    ObMediumCompactionInfo &medium_info,
+    int64_t &schema_version);
+
   static int check_need_merge_and_schedule(
       ObLS &ls,
       ObTablet &tablet,
@@ -121,8 +129,9 @@ protected:
       const int64_t max_reserved_snapshot,
       ObMediumCompactionInfo &medium_info,
       ObGetMergeTablesResult &result);
-  int choose_medium_schema_version(
-      const ObMediumCompactionInfo &medium_info,
+  static int choose_medium_schema_version(
+      common::ObArenaAllocator &allocator,
+      const int64_t medium_snapshot,
       ObTablet &tablet,
       int64_t &schema_version);
   int get_max_reserved_snapshot(int64_t &max_reserved_snapshot);
@@ -139,7 +148,7 @@ protected:
       ObLS &ls,
       ObTablet &tablet,
       const ObAdaptiveMergePolicy::AdaptiveMergeReason &merge_reason,
-      ObIAllocator &allocator,
+      ObArenaAllocator &allocator,
       ObMediumCompactionInfo &medium_info,
       ObGetMergeTablesResult &result,
       int64_t &schema_version);
diff --git a/src/storage/compaction/ob_tablet_merge_ctx.cpp b/src/storage/compaction/ob_tablet_merge_ctx.cpp
index 38910ee786..02c25014f4 100755
--- a/src/storage/compaction/ob_tablet_merge_ctx.cpp
+++ b/src/storage/compaction/ob_tablet_merge_ctx.cpp
@@ -1026,7 +1026,6 @@ int ObTabletMergeCtx::init_merge_info()
   return ret;
 }
 
-
 int ObTabletMergeCtx::get_storage_schema_to_merge(const ObTablesHandleArray &merge_tables_handle)
 {
   int ret = OB_SUCCESS;
@@ -1059,8 +1058,10 @@ int ObTabletMergeCtx::get_storage_schema_to_merge(const ObTablesHandleArray &mer
     } // end of for
 
     if (OB_FAIL(ret)) {
-    } else if (max_column_cnt_in_memtable > column_cnt_in_schema
-      || max_schema_version_in_memtable > schema_on_tablet->get_schema_version()) {
+    } else if (max_column_cnt_in_memtable <= column_cnt_in_schema
+            && max_schema_version_in_memtable <= schema_on_tablet->get_schema_version()) {
+      // do nothing
+    } else {
       // need alloc new storage schema & set column cnt
       void *buf = nullptr;
       if (OB_ISNULL(buf = allocator_.alloc(sizeof(ObStorageSchema)))) {