Remove code for setting cluster version via V2 API

Signed-off-by: Marek Siarkowicz <siarkowicz@google.com>

server/etcdserver/server.go

@@ -2267,46 +2267,6 @@ func (s *EtcdServer) monitorCompactHash() {
 	}
 }
 
-func (s *EtcdServer) updateClusterVersionV2(ver string) {
-	lg := s.Logger()
-
-	if s.cluster.Version() == nil {
-		lg.Info(
-			"setting up initial cluster version using v2 API",
-			zap.String("cluster-version", version.Cluster(ver)),
-		)
-	} else {
-		lg.Info(
-			"updating cluster version using v2 API",
-			zap.String("from", version.Cluster(s.cluster.Version().String())),
-			zap.String("to", version.Cluster(ver)),
-		)
-	}
-
-	req := pb.Request{
-		Method: "PUT",
-		Path:   membership.StoreClusterVersionKey(),
-		Val:    ver,
-	}
-
-	ctx, cancel := context.WithTimeout(s.ctx, s.Cfg.ReqTimeout())
-	_, err := s.Do(ctx, req)
-	cancel()
-
-	switch err {
-	case nil:
-		lg.Info("cluster version is updated", zap.String("cluster-version", version.Cluster(ver)))
-		return
-
-	case errors.ErrStopped:
-		lg.Warn("aborting cluster version update; server is stopped", zap.Error(err))
-		return
-
-	default:
-		lg.Warn("failed to update cluster version", zap.Error(err))
-	}
-}
-
 func (s *EtcdServer) updateClusterVersionV3(ver string) {
 	lg := s.Logger()
 

server/etcdserver/server_test.go

@@ -21,7 +21,6 @@ import (
 	"math"
 	"net/http"
 	"os"
-	"path"
 	"path/filepath"
 	"reflect"
 	"sync"
@@ -1631,53 +1630,6 @@ func TestPublishV3Retry(t *testing.T) {
 	<-ch
 }
 
-func TestUpdateVersion(t *testing.T) {
-	n := newNodeRecorder()
-	ch := make(chan any, 1)
-	// simulate that request has gone through consensus
-	ch <- Response{}
-	w := wait.NewWithResponse(ch)
-	ctx, cancel := context.WithCancel(context.TODO())
-	srv := &EtcdServer{
-		lgMu:       new(sync.RWMutex),
-		lg:         zaptest.NewLogger(t),
-		memberId:   1,
-		Cfg:        config.ServerConfig{Logger: zaptest.NewLogger(t), TickMs: 1, SnapshotCatchUpEntries: DefaultSnapshotCatchUpEntries},
-		r:          *newRaftNode(raftNodeConfig{lg: zaptest.NewLogger(t), Node: n}),
-		attributes: membership.Attributes{Name: "node1", ClientURLs: []string{"http://node1.com"}},
-		cluster:    &membership.RaftCluster{},
-		w:          w,
-		reqIDGen:   idutil.NewGenerator(0, time.Time{}),
-		SyncTicker: &time.Ticker{},
-
-		ctx:    ctx,
-		cancel: cancel,
-	}
-	srv.updateClusterVersionV2("2.0.0")
-
-	action := n.Action()
-	if len(action) != 1 {
-		t.Fatalf("len(action) = %d, want 1", len(action))
-	}
-	if action[0].Name != "Propose" {
-		t.Fatalf("action = %s, want Propose", action[0].Name)
-	}
-	data := action[0].Params[0].([]byte)
-	var r pb.Request
-	if err := r.Unmarshal(data); err != nil {
-		t.Fatalf("unmarshal request error: %v", err)
-	}
-	if r.Method != "PUT" {
-		t.Errorf("method = %s, want PUT", r.Method)
-	}
-	if wpath := path.Join(StoreClusterPrefix, "version"); r.Path != wpath {
-		t.Errorf("path = %s, want %s", r.Path, wpath)
-	}
-	if r.Val != "2.0.0" {
-		t.Errorf("val = %s, want %s", r.Val, "2.0.0")
-	}
-}
-
 func TestUpdateVersionV3(t *testing.T) {
 	n := newNodeRecorder()
 	ch := make(chan any, 1)