diff --git a/contrib/recipes/client.go b/contrib/recipes/client.go
index 9a5613723..2e7bc8d91 100644
--- a/contrib/recipes/client.go
+++ b/contrib/recipes/client.go
@@ -48,11 +48,17 @@ func (ec *EtcdClient) deleteRevKey(key string, rev int64) (bool, error) {
 		Result:      pb.Compare_EQUAL,
 		Target:      pb.Compare_MOD,
 		Key:         []byte(key),
-		ModRevision: rev}
-	req := &pb.RequestUnion{RequestDeleteRange: &pb.DeleteRangeRequest{Key: []byte(key)}}
+		TargetUnion: &pb.Compare_ModRevision{ModRevision: rev},
+	}
+	req := &pb.RequestUnion{Request: &pb.RequestUnion_RequestDeleteRange{
+		RequestDeleteRange: &pb.DeleteRangeRequest{Key: []byte(key)}}}
 	txnresp, err := ec.KV.Txn(
 		context.TODO(),
-		&pb.TxnRequest{[]*pb.Compare{cmp}, []*pb.RequestUnion{req}, nil})
+		&pb.TxnRequest{
+			Compare: []*pb.Compare{cmp},
+			Success: []*pb.RequestUnion{req},
+			Failure: nil,
+		})
 	if err != nil {
 		return false, err
 	} else if txnresp.Succeeded == false {
diff --git a/contrib/recipes/key.go b/contrib/recipes/key.go
index f4d30ed71..2fd2f770f 100644
--- a/contrib/recipes/key.go
+++ b/contrib/recipes/key.go
@@ -86,15 +86,17 @@ func NewUniqueKV(client *EtcdClient, prefix string, val string, leaseID lease.Le
 // not yet exist.
 func putNewKV(ec *EtcdClient, key, val string, leaseID lease.LeaseID) (int64, error) {
 	cmp := &pb.Compare{
-		Result: pb.Compare_EQUAL,
-		Target: pb.Compare_VERSION,
-		Key:    []byte(key)}
-	req := &pb.RequestUnion{
-		RequestPut: &pb.PutRequest{
-			Key:   []byte(key),
-			Value: []byte(val),
-			Lease: int64(leaseID)}}
+		Result:      pb.Compare_EQUAL,
+		Target:      pb.Compare_VERSION,
+		Key:         []byte(key),
+		TargetUnion: &pb.Compare_Version{Version: 0}}
 
+	req := &pb.RequestUnion{
+		Request: &pb.RequestUnion_RequestPut{
+			RequestPut: &pb.PutRequest{
+				Key:   []byte(key),
+				Value: []byte(val),
+				Lease: int64(leaseID)}}}
 	txnresp, err := ec.KV.Txn(
 		context.TODO(),
 		&pb.TxnRequest{[]*pb.Compare{cmp}, []*pb.RequestUnion{req}, nil})
@@ -143,17 +145,23 @@ func newSequentialKV(client *EtcdClient, prefix, val string, leaseID lease.Lease
 		Target: pb.Compare_MOD,
 		Key:    []byte(baseKey),
 		// current revision might contain modification so +1
-		ModRevision: resp.Header.Revision + 1,
+		TargetUnion: &pb.Compare_ModRevision{ModRevision: resp.Header.Revision + 1},
 	}
-	prPrefix := &pb.PutRequest{Key: baseKey, Lease: int64(leaseID)}
-	reqPrefix := &pb.RequestUnion{RequestPut: prPrefix}
 
-	prNewKey := &pb.PutRequest{
-		Key:   []byte(newKey),
-		Value: []byte(val),
-		Lease: int64(leaseID),
-	}
-	reqNewKey := &pb.RequestUnion{RequestPut: prNewKey}
+	reqPrefix := &pb.RequestUnion{
+		Request: &pb.RequestUnion_RequestPut{
+			RequestPut: &pb.PutRequest{
+				Key:   baseKey,
+				Lease: int64(leaseID),
+			}}}
+
+	reqNewKey := &pb.RequestUnion{
+		Request: &pb.RequestUnion_RequestPut{
+			RequestPut: &pb.PutRequest{
+				Key:   []byte(newKey),
+				Value: []byte(val),
+				Lease: int64(leaseID),
+			}}}
 
 	txnresp, err := client.KV.Txn(
 		context.TODO(),
diff --git a/contrib/recipes/stm.go b/contrib/recipes/stm.go
index e4d2b47c8..d7a02ec18 100644
--- a/contrib/recipes/stm.go
+++ b/contrib/recipes/stm.go
@@ -84,15 +84,19 @@ func (s *STM) commit() (ok bool, err error) {
 			Result:      pb.Compare_LESS,
 			Target:      pb.Compare_MOD,
 			Key:         []byte(k),
-			ModRevision: rk.Revision() + 1,
+			TargetUnion: &pb.Compare_ModRevision{ModRevision: rk.Revision() + 1},
 		}
 		cmps = append(cmps, cmp)
 	}
 	// apply all writes
 	puts := []*pb.RequestUnion{}
 	for k, v := range s.wset {
-		put := &pb.PutRequest{Key: []byte(k), Value: []byte(v)}
-		puts = append(puts, &pb.RequestUnion{RequestPut: put})
+		puts = append(puts, &pb.RequestUnion{
+			Request: &pb.RequestUnion_RequestPut{
+				RequestPut: &pb.PutRequest{
+					Key:   []byte(k),
+					Value: []byte(v),
+				}}})
 	}
 	txnresp, err := s.client.KV.Txn(context.TODO(), &pb.TxnRequest{cmps, puts, nil})
 	return txnresp.Succeeded, err
diff --git a/contrib/recipes/watch.go b/contrib/recipes/watch.go
index 64fbc7f62..0f25c965d 100644
--- a/contrib/recipes/watch.go
+++ b/contrib/recipes/watch.go
@@ -23,6 +23,7 @@ import (
 
 type Watcher struct {
 	wstream pb.Watch_WatchClient
+	cancel  context.CancelFunc
 	donec   chan struct{}
 	id      storage.WatchID
 	recvc   chan *storagepb.Event
@@ -38,7 +39,8 @@ func NewPrefixWatcher(c *EtcdClient, prefix string, rev int64) (*Watcher, error)
 }
 
 func newWatcher(c *EtcdClient, key string, rev int64, isPrefix bool) (*Watcher, error) {
-	w, err := c.Watch.Watch(context.Background())
+	ctx, cancel := context.WithCancel(context.Background())
+	w, err := c.Watch.Watch(ctx)
 	if err != nil {
 		return nil, err
 	}
@@ -50,7 +52,7 @@ func newWatcher(c *EtcdClient, key string, rev int64, isPrefix bool) (*Watcher,
 		req.Key = []byte(key)
 	}
 
-	if err := w.Send(&pb.WatchRequest{CreateRequest: req}); err != nil {
+	if err := w.Send(&pb.WatchRequest{RequestUnion: &pb.WatchRequest_CreateRequest{CreateRequest: req}}); err != nil {
 		return nil, err
 	}
 
@@ -63,6 +65,7 @@ func newWatcher(c *EtcdClient, key string, rev int64, isPrefix bool) (*Watcher,
 	}
 	ret := &Watcher{
 		wstream: w,
+		cancel:  cancel,
 		donec:   make(chan struct{}),
 		id:      storage.WatchID(wresp.WatchId),
 		recvc:   make(chan *storagepb.Event),
@@ -72,11 +75,14 @@ func newWatcher(c *EtcdClient, key string, rev int64, isPrefix bool) (*Watcher,
 }
 
 func (w *Watcher) Close() error {
+	defer w.cancel()
 	if w.wstream == nil {
 		return w.lastErr
 	}
-	req := &pb.WatchCancelRequest{WatchId: int64(w.id)}
-	err := w.wstream.Send(&pb.WatchRequest{CancelRequest: req})
+	req := &pb.WatchRequest{RequestUnion: &pb.WatchRequest_CancelRequest{
+		CancelRequest: &pb.WatchCancelRequest{
+			WatchId: int64(w.id)}}}
+	err := w.wstream.Send(req)
 	if err != nil && w.lastErr == nil {
 		return err
 	}