pool visibileIter

pkg/vm/engine/tae/catalog/object_list.go

@@ -334,6 +334,10 @@ func (l *ObjectList) WaitUntilCommitted(ts types.TS) {
 
 // Iterator part
 
+var _iterPool = sync.Pool{New: func() any {
+	return &VisibleCommittedObjectIt{}
+}}
+
 type VisibleCommittedObjectIt struct {
 	iter        btree.IterG[*ObjectEntry]
 	curr        *ObjectEntry
@@ -348,13 +352,12 @@ type VisibleCommittedObjectIt struct {
 // 1. txn is mock txn, no waiting, only return committed non-dropped objects, used for status check
 
 func (l *ObjectList) MakeVisibleCommittedObjectIt(txn txnif.TxnReader) *VisibleCommittedObjectIt {
+	it := _iterPool.Get().(*VisibleCommittedObjectIt)
 	tree := l.tree.Load()
-	it := tree.Iter()
-	return &VisibleCommittedObjectIt{
-		iter:      it,
-		txn:       txn,
-		isMockTxn: len(txn.GetCtx()) == 0,
-	}
+	it.iter = tree.Iter()
+	it.txn = txn
+	it.isMockTxn = len(txn.GetCtx()) == 0
+	return it
 }
 
 func (it *VisibleCommittedObjectIt) Next() bool {
@@ -401,6 +404,11 @@ func (it *VisibleCommittedObjectIt) Item() *ObjectEntry {
 
 func (it *VisibleCommittedObjectIt) Release() {
 	it.iter.Release()
+	it.curr = nil
+	it.txn = nil
+	it.firstCalled = false
+	it.isMockTxn = false
+	_iterPool.Put(it)
 }
 
 // utils