diff --git a/Makefile b/Makefile
index 1fbdac9..187c746 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,8 @@ all: testdeps
 	go test ./... -short -race
 	env GOOS=linux GOARCH=386 go test ./...
 	go vet
+	go get github.com/gordonklaus/ineffassign
+	ineffassign .
 
 testdeps: testdata/redis/src/redis-server
 
diff --git a/cluster.go b/cluster.go
index 55bc5ba..03c186c 100644
--- a/cluster.go
+++ b/cluster.go
@@ -533,10 +533,12 @@ func (c *clusterState) slotSlaveNode(slot int) (*clusterNode, error) {
 			n := rand.Intn(len(nodes)-1) + 1
 			slave = nodes[n]
 			if !slave.Loading() {
-				break
+				return slave, nil
 			}
 		}
-		return slave, nil
+
+		// All slaves are loading - use master.
+		return nodes[0], nil
 	}
 }
 
@@ -979,9 +981,10 @@ func (c *ClusterClient) defaultProcess(cmd Cmder) error {
 			break
 		}
 
-		// If slave is loading - read from master.
+		// If slave is loading - pick another node.
 		if c.opt.ReadOnly && internal.IsLoadingError(err) {
 			node.MarkAsLoading()
+			node = nil
 			continue
 		}
 
diff --git a/commands.go b/commands.go
index 4a2eadc..85262cc 100644
--- a/commands.go
+++ b/commands.go
@@ -1447,6 +1447,7 @@ type XReadGroupArgs struct {
 	Streams  []string
 	Count    int64
 	Block    time.Duration
+	NoAck    bool
 }
 
 func (c *cmdable) XReadGroup(a *XReadGroupArgs) *XStreamSliceCmd {
@@ -1458,6 +1459,9 @@ func (c *cmdable) XReadGroup(a *XReadGroupArgs) *XStreamSliceCmd {
 	if a.Block >= 0 {
 		args = append(args, "block", int64(a.Block/time.Millisecond))
 	}
+	if a.NoAck {
+		args = append(args, "noack")
+	}
 	args = append(args, "streams")
 	for _, s := range a.Streams {
 		args = append(args, s)
diff --git a/commands_test.go b/commands_test.go
index 3c57323..5bea31f 100644
--- a/commands_test.go
+++ b/commands_test.go
@@ -69,7 +69,7 @@ var _ = Describe("Commands", func() {
 			val, err := client.Wait(1, wait).Result()
 			Expect(err).NotTo(HaveOccurred())
 			Expect(val).To(Equal(int64(0)))
-			Expect(time.Now()).To(BeTemporally("~", start.Add(wait), time.Second))
+			Expect(time.Now()).To(BeTemporally("~", start.Add(wait), 3*time.Second))
 		})
 
 		It("should Select", func() {
@@ -2793,10 +2793,13 @@ var _ = Describe("Commands", func() {
 				Member: "one",
 			}).Err()
 			Expect(err).NotTo(HaveOccurred())
+
 			err = client.ZAdd("zset", redis.Z{
 				Score:  2,
 				Member: "two",
 			}).Err()
+			Expect(err).NotTo(HaveOccurred())
+
 			members, err = client.ZPopMin("zset", 10).Result()
 			Expect(err).NotTo(HaveOccurred())
 			Expect(members).To(Equal([]redis.Z{{
@@ -3541,8 +3544,9 @@ var _ = Describe("Commands", func() {
 				res, err := client.XReadGroup(&redis.XReadGroupArgs{
 					Group:    "group",
 					Consumer: "consumer",
-					Streams:  []string{"stream", "0"},
+					Streams:  []string{"stream", ">"},
 				}).Result()
+				Expect(err).NotTo(HaveOccurred())
 				Expect(res).To(Equal([]redis.XStream{{
 					Stream: "stream",
 					Messages: []redis.XMessage{