*: fix the split problem caused by no enough replicas

pkg/keyspace/tso_keyspace_group.go

@@ -155,9 +155,11 @@ func (m *GroupManager) allocNodesToAllKeyspaceGroups() {
 		ticker = time.NewTicker(time.Millisecond * 100)
 	})
 	defer ticker.Stop()
+	log.Info("start to alloc nodes to all keyspace groups")
 	for {
 		select {
 		case <-m.ctx.Done():
+			log.Info("stop to alloc nodes to all keyspace groups")
 			return
 		case <-ticker.C:
 		}
@@ -170,6 +172,10 @@ func (m *GroupManager) allocNodesToAllKeyspaceGroups() {
 			log.Error("failed to load all keyspace groups", zap.Error(err))
 			continue
 		}
+		// if the default keyspace is not initialized, we should wait for the default keyspace to be initialized.
+		if len(groups) == 0 {
+			continue
+		}
 		withError := false
 		for _, group := range groups {
 			if len(group.Members) < utils.KeyspaceGroupDefaultReplicaCount {
@@ -184,14 +190,15 @@ func (m *GroupManager) allocNodesToAllKeyspaceGroups() {
 		}
 		if !withError {
 			// all keyspace groups have equal or more than default replica count
+			log.Info("all keyspace groups have equal or more than default replica count, stop to alloc node")
 			return
 		}
 	}
 }
 
 func (m *GroupManager) initTSONodesWatcher(client *clientv3.Client, clusterID uint64) {
 	tsoServiceKey := discovery.TSOPath(clusterID)
-	tsoServiceEndKey := clientv3.GetPrefixRangeEnd(tsoServiceKey) + "/"
+	tsoServiceEndKey := clientv3.GetPrefixRangeEnd(tsoServiceKey)
 
 	putFn := func(kv *mvccpb.KeyValue) error {
 		s := &discovery.ServiceRegistryEntry{}

pkg/mcs/discovery/discover.go

@@ -22,7 +22,7 @@ import (
 // Discover is used to get all the service instances of the specified service name.
 func Discover(cli *clientv3.Client, clusterID, serviceName string) ([]string, error) {
 	key := discoveryPath(clusterID, serviceName) + "/"
-	endKey := clientv3.GetPrefixRangeEnd(key) + "/"
+	endKey := clientv3.GetPrefixRangeEnd(key)
 
 	withRange := clientv3.WithRange(endKey)
 	resp, err := etcdutil.EtcdKVGet(cli, key, withRange)

pkg/mcs/discovery/registry_entry.go

@@ -23,7 +23,7 @@ import (
 
 // ServiceRegistryEntry is the registry entry of a service
 type ServiceRegistryEntry struct {
-	ServiceAddr string `json:"serviceAddr"`
+	ServiceAddr string `json:"service-addr"`
 }
 
 // Serialize this service registry entry

server/server.go

@@ -559,13 +559,14 @@ func (s *Server) Run() error {
 	if err := s.startEtcd(s.ctx); err != nil {
 		return err
 	}
-	failpoint.Inject("delayStartServer", func() {
-		time.Sleep(2 * time.Second)
-	})
+
 	if err := s.startServer(s.ctx); err != nil {
 		return err
 	}
 
+	failpoint.Inject("delayStartServerLoop", func() {
+		time.Sleep(2 * time.Second)
+	})
 	s.startServerLoop(s.ctx)
 
 	return nil

tests/cluster.go

@@ -33,6 +33,7 @@ import (
 	"github.com/tikv/pd/pkg/errs"
 	"github.com/tikv/pd/pkg/id"
 	"github.com/tikv/pd/pkg/keyspace"
+	tsoserver "github.com/tikv/pd/pkg/mcs/tso/server"
 	"github.com/tikv/pd/pkg/mcs/utils"
 	"github.com/tikv/pd/pkg/schedule/schedulers"
 	"github.com/tikv/pd/pkg/swaggerserver"
@@ -83,6 +84,38 @@ func NewTestAPIServer(ctx context.Context, cfg *config.Config) (*TestServer, err
 	return createTestServer(ctx, cfg, []string{utils.APIServiceName})
 }
 
+// StartSingleTSOTestServer creates and starts a tso server with default config for testing.
+func StartSingleTSOTestServer(ctx context.Context, re *require.Assertions, backendEndpoints, listenAddrs string) (*tsoserver.Server, func(), error) {
+	cfg := tsoserver.NewConfig()
+	cfg.BackendEndpoints = backendEndpoints
+	cfg.ListenAddr = listenAddrs
+	cfg, err := tsoserver.GenerateConfig(cfg)
+	re.NoError(err)
+	// Setup the logger.
+	err = logutil.SetupLogger(cfg.Log, &cfg.Logger, &cfg.LogProps, cfg.Security.RedactInfoLog)
+	if err != nil {
+		return nil, nil, err
+	}
+	zapLogOnce.Do(func() {
+		log.ReplaceGlobals(cfg.Logger, cfg.LogProps)
+	})
+	re.NoError(err)
+	return NewTSOTestServer(ctx, cfg)
+}
+
+// NewTSOTestServer creates a tso server with given config for testing.
+func NewTSOTestServer(ctx context.Context, cfg *tsoserver.Config) (*tsoserver.Server, testutil.CleanupFunc, error) {
+	s := tsoserver.CreateServer(ctx, cfg)
+	if err := s.Run(); err != nil {
+		return nil, nil, err
+	}
+	cleanup := func() {
+		s.Close()
+		os.RemoveAll(cfg.DataDir)
+	}
+	return s, cleanup, nil
+}
+
 func createTestServer(ctx context.Context, cfg *config.Config, services []string) (*TestServer, error) {
 	err := logutil.SetupLogger(cfg.Log, &cfg.Logger, &cfg.LogProps, cfg.Security.RedactInfoLog)
 	if err != nil {

tests/integrations/mcs/tso/api_test.go

@@ -112,7 +112,7 @@ func mustGetKeyspaceGroupMembers(re *require.Assertions, server *tso.Server) map
 
 func TestTSOServerStartFirst(t *testing.T) {
 	re := require.New(t)
-	re.NoError(failpoint.Enable("github.com/tikv/pd/server/delayStartServer", `return(true)`))
+	re.NoError(failpoint.Enable("github.com/tikv/pd/server/delayStartServerLoop", `return(true)`))
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
@@ -171,5 +171,5 @@ func TestTSOServerStartFirst(t *testing.T) {
 	re.Len(group.Keyspaces, 2)
 	re.Len(group.Members, 2)
 
-	re.NoError(failpoint.Disable("github.com/tikv/pd/server/delayStartServer"))
+	re.NoError(failpoint.Disable("github.com/tikv/pd/server/delayStartServerLoop"))
 }

tests/pdctl/keyspace/keyspace_group_test.go

@@ -18,12 +18,18 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"strings"
 	"testing"
+	"time"
 
+	"github.com/pingcap/failpoint"
 	"github.com/stretchr/testify/require"
 	"github.com/tikv/pd/pkg/mcs/utils"
 	"github.com/tikv/pd/pkg/storage/endpoint"
+	"github.com/tikv/pd/pkg/utils/tempurl"
+	"github.com/tikv/pd/pkg/utils/testutil"
 	"github.com/tikv/pd/server/apiv2/handlers"
+	"github.com/tikv/pd/server/config"
 	"github.com/tikv/pd/tests"
 	"github.com/tikv/pd/tests/pdctl"
 	handlersutil "github.com/tikv/pd/tests/server/apiv2/handlers"
@@ -82,3 +88,42 @@ func TestKeyspaceGroup(t *testing.T) {
 	re.Equal(uint32(2), keyspaceGroup.ID)
 	re.Equal(keyspaceGroup.Keyspaces, []uint32{222, 333})
 }
+
+func TestSplitKeyspaceGroup(t *testing.T) {
+	re := require.New(t)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	re.NoError(failpoint.Enable("github.com/tikv/pd/pkg/keyspace/acceleratedAllocNodes", `return(true)`))
+	re.NoError(failpoint.Enable("github.com/tikv/pd/server/delayStartServerLoop", `return(true)`))
+	tc, err := tests.NewTestAPICluster(ctx, 3, func(conf *config.Config, serverName string) {
+		conf.Keyspace.PreAlloc = []string{"keyspace_a", "keyspace_b"}
+	})
+	re.NoError(err)
+	err = tc.RunInitialServers()
+	re.NoError(err)
+	pdAddr := tc.GetConfig().GetClientURL()
+
+	_, tsoServerCleanup1, err := tests.StartSingleTSOTestServer(ctx, re, pdAddr, tempurl.Alloc())
+	defer tsoServerCleanup1()
+	re.NoError(err)
+	_, tsoServerCleanup2, err := tests.StartSingleTSOTestServer(ctx, re, pdAddr, tempurl.Alloc())
+	defer tsoServerCleanup2()
+	re.NoError(err)
+	cmd := pdctlCmd.GetRootCmd()
+
+	time.Sleep(2 * time.Second)
+	tc.WaitLeader()
+	leaderServer := tc.GetServer(tc.GetLeader())
+	re.NoError(leaderServer.BootstrapCluster())
+
+	// split keyspace group.
+	testutil.Eventually(re, func() bool {
+		args := []string{"-u", pdAddr, "keyspace-group", "split", "0", "1", "2"}
+		output, err := pdctl.ExecuteCommand(cmd, args...)
+		re.NoError(err)
+		return strings.Contains(string(output), "Success")
+	})
+
+	re.NoError(failpoint.Disable("github.com/tikv/pd/pkg/keyspace/acceleratedAllocNodes"))
+	re.NoError(failpoint.Disable("github.com/tikv/pd/server/delayStartServerLoop"))
+}