From e17792b5b81b0319ab2ed89384941a73d293ab41 Mon Sep 17 00:00:00 2001
From: Roy Crihfield <roy@manteia.ltd>
Date: Mon, 23 Aug 2021 15:19:26 +0800
Subject: [PATCH] clone is not needed here

redundant since dbWriter uses a clone
---
 db/memdb/db.go | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/db/memdb/db.go b/db/memdb/db.go
index 1485aae1dcba..be5cb83079c4 100644
--- a/db/memdb/db.go
+++ b/db/memdb/db.go
@@ -108,6 +108,7 @@ func (db *MemDB) ReadWriter() dbm.DBReadWriter {
 	db.mtx.RLock()
 	defer db.mtx.RUnlock()
 	atomic.AddInt32(&db.openWriters, 1)
+	// Clone creates a copy-on-write extension of the current tree
 	return &dbWriter{db.newTxn(db.btree.Clone())}
 }
 
@@ -124,8 +125,6 @@ func (db *MemDB) save(target uint64) (uint64, error) {
 		return 0, err
 	}
 	db.saved[target] = db.btree
-	// BTree's Clone() makes a CoW extension of the current tree
-	db.btree = db.btree.Clone()
 	db.vmgr = newVmgr
 	return target, nil
 }