FIX: It shouldn't sort the replicas and isr while the order is

meaningful to Kafka(preferred leader)

client.go

@@ -297,7 +297,7 @@ func (client *client) Replicas(topic string, partitionID int32) ([]int32, error)
 	if metadata.Err == ErrReplicaNotAvailable {
 		return nil, metadata.Err
 	}
-	return dupeAndSort(metadata.Replicas), nil
+	return metadata.Replicas, nil
 }
 
 func (client *client) InSyncReplicas(topic string, partitionID int32) ([]int32, error) {
@@ -322,7 +322,7 @@ func (client *client) InSyncReplicas(topic string, partitionID int32) ([]int32,
 	if metadata.Err == ErrReplicaNotAvailable {
 		return nil, metadata.Err
 	}
-	return dupeAndSort(metadata.Isr), nil
+	return metadata.Isr, nil
 }
 
 func (client *client) Leader(topic string, partitionID int32) (*Broker, error) {

client_test.go

@@ -188,23 +188,23 @@ func TestClientMetadata(t *testing.T) {
 	replicas, err = client.Replicas("my_topic", 0)
 	if err != nil {
 		t.Error(err)
-	} else if replicas[0] != 1 {
-		t.Error("Incorrect (or unsorted) replica")
-	} else if replicas[1] != 3 {
-		t.Error("Incorrect (or unsorted) replica")
+	} else if replicas[0] != 3 {
+		t.Error("Incorrect (or sorted) replica")
+	} else if replicas[1] != 1 {
+		t.Error("Incorrect (or sorted) replica")
 	} else if replicas[2] != 5 {
-		t.Error("Incorrect (or unsorted) replica")
+		t.Error("Incorrect (or sorted) replica")
 	}
 
 	isr, err = client.InSyncReplicas("my_topic", 0)
 	if err != nil {
 		t.Error(err)
 	} else if len(isr) != 2 {
 		t.Error("Client returned incorrect ISRs for partition:", isr)
-	} else if isr[0] != 1 {
-		t.Error("Incorrect (or unsorted) ISR:", isr)
-	} else if isr[1] != 5 {
-		t.Error("Incorrect (or unsorted) ISR:", isr)
+	} else if isr[0] != 5 {
+		t.Error("Incorrect (or sorted) ISR:", isr)
+	} else if isr[1] != 1 {
+		t.Error("Incorrect (or sorted) ISR:", isr)
 	}
 
 	leader.Close()

utils.go

@@ -3,7 +3,6 @@ package sarama
 import (
 	"bufio"
 	"net"
-	"sort"
 )
 
 type none struct{}
@@ -23,16 +22,6 @@ func (slice int32Slice) Swap(i, j int) {
 	slice[i], slice[j] = slice[j], slice[i]
 }
 
-func dupeAndSort(input []int32) []int32 {
-	ret := make([]int32, 0, len(input))
-	for _, val := range input {
-		ret = append(ret, val)
-	}
-
-	sort.Sort(int32Slice(ret))
-	return ret
-}
-
 func withRecover(fn func()) {
 	defer func() {
 		handler := PanicHandler