From 8bc59b66d157d4959528ee0aad131b824f25b351 Mon Sep 17 00:00:00 2001
From: Xiang Li <xiangli.cs@gmail.com>
Date: Wed, 23 Dec 2015 18:58:34 -0800
Subject: [PATCH] backend: do not commit unless there is a pending change

Reduce the nubmer of fsync etcd issues when the cluster is
idle.
---
 storage/backend/batch_tx.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/storage/backend/batch_tx.go b/storage/backend/batch_tx.go
index 9aa25bbc4..06b5b416d 100644
--- a/storage/backend/batch_tx.go
+++ b/storage/backend/batch_tx.go
@@ -132,7 +132,11 @@ func (t *batchTx) commit(stop bool) {
 	var err error
 	// commit the last tx
 	if t.tx != nil {
+		if t.pending == 0 && !stop {
+			return
+		}
 		err = t.tx.Commit()
+		t.pending = 0
 		if err != nil {
 			log.Fatalf("storage: cannot commit tx (%s)", err)
 		}