Improve memtable debug log

src/storage/meta_mem/ob_tenant_meta_mem_mgr.cpp

@@ -630,13 +630,15 @@ void ObTenantMetaMemMgr::batch_gc_memtable_()
         } else {
           (void)batch_destroy_memtable_(memtable_set);
 
+          int64_t batch_destroyed_occupy_size = 0;
           for (common::hash::ObHashSet<uint64_t>::iterator set_iter = memtable_set->begin();
                set_iter != memtable_set->end();
                ++set_iter) {
+            batch_destroyed_occupy_size += ((ObMemtable *)(set_iter->first))->get_occupied_size();
             pool_arr_[static_cast<int>(ObITable::TableType::DATA_MEMTABLE)]->free_obj((void *)(set_iter->first));
           }
 
-          LOG_INFO("batch gc memtable successfully", K(memtable_set->size()));
+          FLOG_INFO("batch gc memtable successfully", K(memtable_set->size()), K(batch_destroyed_occupy_size));
           while (OB_TMP_FAIL(memtable_set->clear())) {
             LOG_ERROR("clear memtable set failed", K(tmp_ret), KPC(memtable_set));
           }

src/storage/tablet/ob_tablet_memtable_mgr.cpp

@@ -748,9 +748,11 @@ int ObTabletMemtableMgr::release_head_memtable_(ObIMemtable *imemtable,
   } else {
     const share::ObLSID &ls_id = ls_->get_ls_id();
     const int64_t idx = get_memtable_idx(memtable_head_);
+    int64_t occupy_size = 0;
     if (nullptr != tables_[idx] && memtable == tables_[idx]) {
       LOG_INFO("release head memtable", K(ret), K(ls_id), KPC(memtable));
       ObMtStat& mt_stat = memtable->get_mt_stat();
+      occupy_size = memtable->get_occupied_size();
       if (0 == mt_stat.release_time_) {
         mt_stat.release_time_ = ObTimeUtility::current_time();
       } else {
@@ -771,7 +773,7 @@ int ObTabletMemtableMgr::release_head_memtable_(ObIMemtable *imemtable,
         FLOG_INFO("allow active memtable to be freezed", K(ls_id), KPC(active_memtable));
       }
 
-      FLOG_INFO("succeed to release head data memtable", K(ret), K(ls_id), K(tablet_id_));
+      FLOG_INFO("succeed to release head data memtable", K(ret), K(ls_id), K(tablet_id_), K(occupy_size));
     }
   }