ddl memtable use allocator from ddl kv

mittest/mtlenv/storage/blocksstable/ob_index_block_data_prepare.h

@@ -724,7 +724,7 @@ void TestIndexBlockDataPrepare::prepare_ddl_kv()
 
   share::SCN ddl_start_scn;
   ddl_start_scn.convert_from_ts(ObTimeUtility::current_time());
-  ASSERT_EQ(OB_SUCCESS, ddl_kv_.init(*tablet_handle.get_obj(), sstable_.get_key(), ddl_start_scn, DATA_CURRENT_VERSION));
+  ASSERT_EQ(OB_SUCCESS, ddl_kv_.init(allocator_, *tablet_handle.get_obj(), sstable_.get_key(), ddl_start_scn, DATA_CURRENT_VERSION));
 
   SMART_VAR(ObSSTableSecMetaIterator, meta_iter) {
     ObDatumRange query_range;
@@ -1223,7 +1223,7 @@ void TestIndexBlockDataPrepare::prepare_merge_ddl_kvs()
     void *buf = allocator_.alloc(sizeof(ObDDLMemtable));
     ASSERT_NE(nullptr, buf);
     ObDDLMemtable *new_ddl_table = new (buf) ObDDLMemtable;
-    ASSERT_EQ(OB_SUCCESS, new_ddl_table->init(*tablet_handle.get_obj(), ddl_key, ddl_start_scn, 4000));
+    ASSERT_EQ(OB_SUCCESS, new_ddl_table->init(allocator_, *tablet_handle.get_obj(), ddl_key, ddl_start_scn, 4000));
     ASSERT_EQ(OB_SUCCESS, ddl_kvs_.get_obj()->get_ddl_memtables().push_back(new_ddl_table));
   }
   ObDDLKVHandle kv_handle;

src/storage/ddl/ob_tablet_ddl_kv.cpp

@@ -805,7 +805,7 @@ int64_t ObBlockMetaTree::get_memory_used() const
 /******************             ObDDLKV              **********************/
 
 ObDDLMemtable::ObDDLMemtable()
-  : is_inited_(false), allocator_("ddl_mem_sst", OB_MALLOC_NORMAL_BLOCK_SIZE, MTL_ID()), block_meta_tree_()
+  : is_inited_(false), block_meta_tree_()
 {
 
 }
@@ -816,6 +816,7 @@ ObDDLMemtable::~ObDDLMemtable()
 }
 
 int ObDDLMemtable::init(
+    ObArenaAllocator &allocator,
     ObTablet &tablet,
     const ObITable::TableKey &table_key,
     const share::SCN &ddl_start_scn,
@@ -841,7 +842,7 @@ int ObDDLMemtable::init(
       LOG_WARN("init mem index sstable failed", K(ret), K(table_key), K(ddl_start_scn));
     } else if (OB_FAIL(init_sstable_param(tablet, table_key, ddl_start_scn, sstable_param))) {
       LOG_WARN("init sstable param failed", K(ret));
-    } else if (OB_FAIL(ObSSTable::init(sstable_param, &allocator_))) {
+    } else if (OB_FAIL(ObSSTable::init(sstable_param, &allocator))) {
       LOG_WARN("init sstable failed", K(ret));
     } else {
       is_inited_ = true;
@@ -856,7 +857,6 @@ void ObDDLMemtable::reset()
   is_inited_ = false;
   ObSSTable::reset();
   block_meta_tree_.destroy();
-  allocator_.reset();
 }
 
 void ObDDLMemtable::set_scn_range(
@@ -982,7 +982,7 @@ int ObDDLKV::create_ddl_memtable(ObTablet &tablet, const ObITable::TableKey &tab
     LOG_WARN("allocate memory failed", K(ret), K(sizeof(ObDDLMemtable)));
   } else {
     ddl_memtable = new (buf) ObDDLMemtable;
-    if (OB_FAIL(ddl_memtable->init(tablet, table_key, ddl_start_scn_, data_format_version_))) {
+    if (OB_FAIL(ddl_memtable->init(arena_allocator_, tablet, table_key, ddl_start_scn_, data_format_version_))) {
       LOG_WARN("init ddl memtable failed", K(ret), K(table_key));
     } else if (OB_FAIL(ddl_memtables_.push_back(ddl_memtable))) {
       LOG_WARN("push back ddl memtable failed", K(ret));

src/storage/ddl/ob_tablet_ddl_kv.h

@@ -168,6 +168,7 @@ public:
   ObDDLMemtable();
   virtual ~ObDDLMemtable();
   int init(
+      ObArenaAllocator &allocator,
       ObTablet &tablet,
       const ObITable::TableKey &table_key,
       const share::SCN &ddl_start_scn,
@@ -194,7 +195,6 @@ private:
       ObTabletCreateSSTableParam &sstable_param);
 private:
   bool is_inited_;
-  ObArenaAllocator allocator_;
   ObBlockMetaTree block_meta_tree_;
 };