From e0066c9c0fe671e0b50f208c41305cf3c80d00b1 Mon Sep 17 00:00:00 2001
From: "rui.zheng" <rui.zheng@tcl.com>
Date: Tue, 21 Nov 2017 14:31:18 +0800
Subject: [PATCH] Node filter only applies to node list of more than one node

---
 chain.go    | 2 +-
 selector.go | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/chain.go b/chain.go
index ca7d15b..9dc672b 100644
--- a/chain.go
+++ b/chain.go
@@ -53,7 +53,7 @@ func (c *Chain) NodeGroups() []*NodeGroup {
 }
 
 // LastNode returns the last node of the node list.
-// If the chain is empty, an empty node is returns.
+// If the chain is empty, an empty node will be returned.
 // If the last node is a node group, the first node in the group will be returned.
 func (c *Chain) LastNode() Node {
 	if c.IsEmpty() {
diff --git a/selector.go b/selector.go
index bea2c65..15bbe33 100644
--- a/selector.go
+++ b/selector.go
@@ -16,7 +16,6 @@ var (
 // NodeSelector as a mechanism to pick nodes and mark their status.
 type NodeSelector interface {
 	Select(nodes []Node, opts ...SelectOption) (Node, error)
-	// Mark(node Node)
 }
 
 type defaultSelector struct {
@@ -130,7 +129,7 @@ type FailFilter struct {
 
 // Filter filters nodes.
 func (f *FailFilter) Filter(nodes []Node) []Node {
-	if f.MaxFails <= 0 {
+	if len(nodes) <= 1 || f.MaxFails <= 0 {
 		return nodes
 	}
 	nl := []Node{}