Enable keep-alive by default

Author: vmihailenco

CHANGELOG.md

@@ -5,6 +5,7 @@
 - Ring got new options called `HashReplicas` and `Hash`. It is recommended to set `HashReplicas = 1000` for better keys distribution between shards.
 - Cluster client was optimized to use much less memory when reloading cluster state.
 - PubSub.ReceiveMessage is re-worked to not use ReceiveTimeout so it does not lose data when timeout occurres. In most cases it is recommended to use PubSub.Channel instead.
+- Dialer.KeepAlive is set to 5 minutes by default.
 
 ## v6.12
 

options.go

@@ -85,7 +85,10 @@ func (opt *Options) init() {
 	}
 	if opt.Dialer == nil {
 		opt.Dialer = func() (net.Conn, error) {
-			netDialer := &net.Dialer{Timeout: opt.DialTimeout}
+			netDialer := &net.Dialer{
+				Timeout:   opt.DialTimeout,
+				KeepAlive: 5 * time.Minute,
+			}
 			if opt.TLSConfig == nil {
 				return netDialer.Dial(opt.Network, opt.Addr)
 			} else {