diff --git a/src/rootserver/freeze/ob_major_merge_progress_checker.cpp b/src/rootserver/freeze/ob_major_merge_progress_checker.cpp
index 9d23fd5b03..3b950165ab 100644
--- a/src/rootserver/freeze/ob_major_merge_progress_checker.cpp
+++ b/src/rootserver/freeze/ob_major_merge_progress_checker.cpp
@@ -698,15 +698,17 @@ int ObMajorMergeProgressChecker::set_table_compaction_info_status(
 int ObMajorMergeProgressChecker::validate_index_ckm()
 {
   int ret = OB_SUCCESS;
-  if (idx_ckm_validate_array_.count() < 50
-    && progress_.get_wait_index_ckm_table_cnt() > 100
-    && !is_extra_check_round()) {
-    // do nothing
-  } else if (idx_ckm_validate_array_.count() > 0) {
-    if (OB_FAIL(loop_index_ckm_validate_array())) {
-      LOG_WARN("failed to loop index ckm validate array", KR(ret), K_(tenant_id));
+  if (idx_ckm_validate_array_.count() > 0) {
+    if (idx_ckm_validate_array_.count() < 50
+      && progress_.get_wait_index_ckm_table_cnt() > 100
+      && !is_extra_check_round()) {
+      // do nothing
+    } else {
+      if (OB_FAIL(loop_index_ckm_validate_array())) {
+        LOG_WARN("failed to loop index ckm validate array", KR(ret), K_(tenant_id));
+      }
     }
-    idx_ckm_validate_array_.reset();
+    idx_ckm_validate_array_.reuse(); // reuse array
   }
   return ret;
 }
diff --git a/src/rootserver/freeze/ob_major_merge_scheduler.cpp b/src/rootserver/freeze/ob_major_merge_scheduler.cpp
index b44fa0e104..0067cb3d88 100644
--- a/src/rootserver/freeze/ob_major_merge_scheduler.cpp
+++ b/src/rootserver/freeze/ob_major_merge_scheduler.cpp
@@ -521,13 +521,15 @@ int ObMajorMergeScheduler::handle_merge_progress(
     const int64_t expected_epoch)
 {
   int ret = OB_SUCCESS;
-  if (progress.is_merge_finished()) {
-    LOG_INFO("merge completed", K(global_broadcast_scn), K(progress));
+  if (progress.is_merge_finished() || progress.is_merge_abnomal()) {
+    if (progress.is_merge_abnomal()) {
+      LOG_WARN("merge progress is abnomal, finish progress anyway", K(global_broadcast_scn), K(progress));
+    } else {
+      LOG_INFO("merge completed", K(global_broadcast_scn), K(progress));
+    }
     if (OB_FAIL(try_update_global_merged_scn(expected_epoch))) { // MERGE_STATUS: change to IDLE
       LOG_WARN("fail to update global_merged_scn", KR(ret), K_(tenant_id), K(expected_epoch));
     }
-  } else if (progress.is_merge_abnomal()) {
-    LOG_WARN("merge progress is abnomal", K(global_broadcast_scn), K(progress));
   } else {
     LOG_INFO("this round of traversal is completed, but there are still tablets/tables that have not been merged",
       K(ret), K(global_broadcast_scn), K(progress));
diff --git a/src/storage/compaction/ob_compaction_diagnose.h b/src/storage/compaction/ob_compaction_diagnose.h
index 139ee10e4a..9a1f620f91 100644
--- a/src/storage/compaction/ob_compaction_diagnose.h
+++ b/src/storage/compaction/ob_compaction_diagnose.h
@@ -635,7 +635,7 @@ private:
     if (__pos < buf_size) {                                                                   \
       buf[__pos-1] = '\0';                                                                    \
     } else {                                                                                  \
-      buf[__pos] = '\0';                                                                      \
+      buf[buf_size - 1] = '\0';                                                               \
     }                                                                                         \
     return ret;                                                                               \
   }
diff --git a/src/storage/compaction/ob_medium_compaction_func.cpp b/src/storage/compaction/ob_medium_compaction_func.cpp
index 03694524e0..711757c875 100644
--- a/src/storage/compaction/ob_medium_compaction_func.cpp
+++ b/src/storage/compaction/ob_medium_compaction_func.cpp
@@ -1248,13 +1248,12 @@ int ObMediumCompactionScheduleFunc::schedule_tablet_medium_merge(
     if (OB_FAIL(ret) || !schedule_flag) {
     } else {
       const int64_t major_frozen_snapshot = 0 == input_major_snapshot ? MTL(ObTenantTabletScheduler *)->get_frozen_version() : input_major_snapshot;
-      ObMediumCompactionInfo::ObCompactionType compaction_type = ObMediumCompactionInfo::COMPACTION_TYPE_MAX;
       int64_t schedule_scn = 0;
       if (OB_FAIL(read_medium_info_from_list(*medium_list, last_major_snapshot,
-          major_frozen_snapshot, compaction_type, schedule_scn))) {
+          major_frozen_snapshot, schedule_scn))) {
         LOG_WARN("failed to read medium info from list", K(ret), K(ls_id), K(tablet_id), KPC(medium_list), K(last_major_snapshot));
       } else if (schedule_scn > 0
-              && OB_FAIL(check_need_merge_and_schedule(ls, tablet, schedule_scn, compaction_type, tablet_need_freeze_flag, create_dag_flag))) {
+              && OB_FAIL(check_need_merge_and_schedule(ls, tablet, schedule_scn, tablet_need_freeze_flag, create_dag_flag))) {
         LOG_WARN("failed to check medium merge", K(ret), K(ls_id), K(tablet_id), K(schedule_scn));
       }
     }
@@ -1267,7 +1266,6 @@ int ObMediumCompactionScheduleFunc::read_medium_info_from_list(
   const ObMediumCompactionInfoList &medium_list,
   const int64_t last_major_snapshot,
   const int64_t major_frozen_snapshot,
-  ObMediumCompactionInfo::ObCompactionType &compaction_type,
   int64_t &schedule_scn)
 {
   int ret = OB_SUCCESS;
@@ -1278,7 +1276,6 @@ int ObMediumCompactionScheduleFunc::read_medium_info_from_list(
       if (info->is_medium_compaction()
           || info->medium_snapshot_ <= major_frozen_snapshot) {
         schedule_scn = info->medium_snapshot_;
-        compaction_type = (ObMediumCompactionInfo::ObCompactionType)info->compaction_type_;
       }
       break; // found one unfinish medium info, loop end
     }
@@ -1308,7 +1305,6 @@ int ObMediumCompactionScheduleFunc::check_need_merge_and_schedule(
     ObLS &ls,
     ObTablet &tablet,
     const int64_t schedule_scn,
-    const ObMediumCompactionInfo::ObCompactionType compaction_type,
     bool &tablet_need_freeze_flag,
     bool &create_dag_flag)
 {
diff --git a/src/storage/compaction/ob_medium_compaction_func.h b/src/storage/compaction/ob_medium_compaction_func.h
index 3016c3cec5..8cce5847ef 100644
--- a/src/storage/compaction/ob_medium_compaction_func.h
+++ b/src/storage/compaction/ob_medium_compaction_func.h
@@ -55,7 +55,6 @@ public:
       const ObMediumCompactionInfoList &medium_list,
       const int64_t major_frozen_snapshot,
       const int64_t last_major_snapshot,
-      ObMediumCompactionInfo::ObCompactionType &compaction_type,
       int64_t &schedule_scn);
   static int is_election_leader(const share::ObLSID &ls_id, bool &ls_election_leader);
   static int get_max_sync_medium_scn(
@@ -141,7 +140,6 @@ protected:
       ObLS &ls,
       ObTablet &tablet,
       const int64_t schedule_scn,
-      const ObMediumCompactionInfo::ObCompactionType compaction_type,
       bool &tablet_need_freeze_flag,
       bool &create_dag_flag);
   int schedule_next_medium_primary_cluster(