From cf309757d66d9398aefd5522afbba2ee59a0f34f Mon Sep 17 00:00:00 2001
From: caoming <johncming@yahoo.com>
Date: Wed, 17 Oct 2018 14:18:09 +0800
Subject: [PATCH] mvcc/backend: code format optimization

---
 mvcc/backend/backend.go | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/mvcc/backend/backend.go b/mvcc/backend/backend.go
index 4698c087d..11a1c46c7 100644
--- a/mvcc/backend/backend.go
+++ b/mvcc/backend/backend.go
@@ -399,14 +399,7 @@ func (b *backend) defrag() error {
 			plog.Panicf("cannot open database at %s (%v)", dbp, err)
 		}
 	}
-	b.batchTx.tx, err = b.db.Begin(true)
-	if err != nil {
-		if b.lg != nil {
-			b.lg.Fatal("failed to begin tx", zap.Error(err))
-		} else {
-			plog.Fatalf("cannot begin tx (%s)", err)
-		}
-	}
+	b.batchTx.tx = b.unsafeBegin(true)
 
 	b.readTx.reset()
 	b.readTx.tx = b.unsafeBegin(false)