scheduler: fix scheduler save config

pkg/mcs/scheduling/server/cluster.go

@@ -252,7 +252,7 @@ func (c *Cluster) updateScheduler() {
 					zap.Strings("scheduler-args", scheduler.Args))
 				continue
 			}
-			if err := schedulersController.AddScheduler(s, scheduler.Args...); err != nil {
+			if err := schedulersController.AddScheduler(c.storage, s, scheduler.Args...); err != nil {
 				log.Error("failed to add scheduler",
 					zap.String("scheduler-name", name),
 					zap.Strings("scheduler-args", scheduler.Args),

pkg/schedule/coordinator.go

@@ -357,7 +357,7 @@ func (c *Coordinator) driveSlowNodeScheduler() {
 					s, err := schedulers.CreateScheduler(typ, c.opController, c.cluster.GetStorage(), schedulers.ConfigSliceDecoder(typ, args), c.schedulers.RemoveScheduler)
 					if err != nil {
 						log.Warn("initializing evict-slow-trend scheduler failed", errs.ZapError(err))
-					} else if err = c.schedulers.AddScheduler(s, args...); err != nil {
+					} else if err = c.schedulers.AddScheduler(c.cluster.GetStorage(), s, args...); err != nil {
 						log.Error("can not add scheduler", zap.String("scheduler-name", s.GetName()), zap.Strings("scheduler-args", args), errs.ZapError(err))
 					}
 				}
@@ -459,10 +459,10 @@ func (c *Coordinator) InitSchedulers(needRun bool) {
 		}
 		log.Info("create scheduler with independent configuration", zap.String("scheduler-name", s.GetName()))
 		if needRun {
-			if err = c.schedulers.AddScheduler(s); err != nil {
+			if err = c.schedulers.AddScheduler(c.cluster.GetStorage(), s); err != nil {
 				log.Error("can not add scheduler with independent configuration", zap.String("scheduler-name", s.GetName()), zap.Strings("scheduler-args", cfg.Args), errs.ZapError(err))
 			}
-		} else if err = c.schedulers.AddSchedulerHandler(s); err != nil {
+		} else if err = c.schedulers.AddSchedulerHandler(c.cluster.GetStorage(), s); err != nil {
 			log.Error("can not add scheduler handler with independent configuration", zap.String("scheduler-name", s.GetName()), zap.Strings("scheduler-args", cfg.Args), errs.ZapError(err))
 		}
 	}
@@ -485,14 +485,14 @@ func (c *Coordinator) InitSchedulers(needRun bool) {
 
 		log.Info("create scheduler", zap.String("scheduler-name", s.GetName()), zap.Strings("scheduler-args", schedulerCfg.Args))
 		if needRun {
-			if err = c.schedulers.AddScheduler(s, schedulerCfg.Args...); err != nil && !errors.ErrorEqual(err, errs.ErrSchedulerExisted.FastGenByArgs()) {
+			if err = c.schedulers.AddScheduler(c.cluster.GetStorage(), s, schedulerCfg.Args...); err != nil && !errors.ErrorEqual(err, errs.ErrSchedulerExisted.FastGenByArgs()) {
 				log.Error("can not add scheduler", zap.String("scheduler-name", s.GetName()), zap.Strings("scheduler-args", schedulerCfg.Args), errs.ZapError(err))
 			} else {
 				// Only records the valid scheduler config.
 				scheduleCfg.Schedulers[k] = schedulerCfg
 				k++
 			}
-		} else if err = c.schedulers.AddSchedulerHandler(s, schedulerCfg.Args...); err != nil && !errors.ErrorEqual(err, errs.ErrSchedulerExisted.FastGenByArgs()) {
+		} else if err = c.schedulers.AddSchedulerHandler(c.cluster.GetStorage(), s, schedulerCfg.Args...); err != nil && !errors.ErrorEqual(err, errs.ErrSchedulerExisted.FastGenByArgs()) {
 			log.Error("can not add scheduler handler", zap.String("scheduler-name", s.GetName()), zap.Strings("scheduler-args", schedulerCfg.Args), errs.ZapError(err))
 		}
 	}
@@ -532,7 +532,7 @@ func (c *Coordinator) LoadPlugin(pluginPath string, ch chan string) {
 	}
 	log.Info("create scheduler", zap.String("scheduler-name", s.GetName()))
 	// TODO: handle the plugin in API service mode.
-	if err = c.schedulers.AddScheduler(s); err != nil {
+	if err = c.schedulers.AddScheduler(c.cluster.GetStorage(), s); err != nil {
 		log.Error("can't add scheduler", zap.String("scheduler-name", s.GetName()), errs.ZapError(err))
 		return
 	}

pkg/schedule/schedulers/evict_leader.go

@@ -181,7 +181,7 @@ func newEvictLeaderScheduler(opController *operator.Controller, conf *evictLeade
 	}
 }
 
-// EvictStores returns the IDs of the evict-stores.
+// EvictStoreIDs returns the IDs of the evict-stores.
 func (s *evictLeaderScheduler) EvictStoreIDs() []uint64 {
 	return s.conf.getStores()
 }

pkg/schedule/schedulers/scheduler.go

@@ -124,16 +124,16 @@ func CreateScheduler(typ string, oc *operator.Controller, storage endpoint.Confi
 		return nil, errs.ErrSchedulerCreateFuncNotRegistered.FastGenByArgs(typ)
 	}
 
-	s, err := fn(oc, storage, dec, removeSchedulerCb...)
-	if err != nil {
-		return nil, err
-	}
+	return fn(oc, storage, dec, removeSchedulerCb...)
+}
+
+// SaveSchedulerConfig saves the config of the specified scheduler.
+func SaveSchedulerConfig(storage endpoint.ConfigStorage, s Scheduler) error {
 	data, err := s.EncodeConfig()
 	if err != nil {
-		return nil, err
+		return err
 	}
-	err = storage.SaveSchedulerConfig(s.GetName(), data)
-	return s, err
+	return storage.SaveSchedulerConfig(s.GetName(), data)
 }
 
 // FindSchedulerTypeByName finds the type of the specified name.

pkg/schedule/schedulers/scheduler_controller.go

@@ -127,7 +127,7 @@ func (c *Controller) ResetSchedulerMetrics() {
 }
 
 // AddSchedulerHandler adds the HTTP handler for a scheduler.
-func (c *Controller) AddSchedulerHandler(scheduler Scheduler, args ...string) error {
+func (c *Controller) AddSchedulerHandler(storage endpoint.ConfigStorage, scheduler Scheduler, args ...string) error {
 	c.Lock()
 	defer c.Unlock()
 
@@ -137,6 +137,10 @@ func (c *Controller) AddSchedulerHandler(scheduler Scheduler, args ...string) er
 	}
 
 	c.schedulerHandlers[name] = scheduler
+	if err := SaveSchedulerConfig(storage, scheduler); err != nil {
+		log.Error("can not save scheduler config", zap.String("scheduler-name", scheduler.GetName()), errs.ZapError(err))
+		return err
+	}
 	c.cluster.GetSchedulerConfig().AddSchedulerCfg(scheduler.GetType(), args)
 	return nil
 }
@@ -171,7 +175,7 @@ func (c *Controller) RemoveSchedulerHandler(name string) error {
 }
 
 // AddScheduler adds a scheduler.
-func (c *Controller) AddScheduler(scheduler Scheduler, args ...string) error {
+func (c *Controller) AddScheduler(storage endpoint.ConfigStorage, scheduler Scheduler, args ...string) error {
 	c.Lock()
 	defer c.Unlock()
 
@@ -187,6 +191,10 @@ func (c *Controller) AddScheduler(scheduler Scheduler, args ...string) error {
 	c.wg.Add(1)
 	go c.runScheduler(s)
 	c.schedulers[s.Scheduler.GetName()] = s
+	if err := SaveSchedulerConfig(storage, scheduler); err != nil {
+		log.Error("can not save scheduler config", zap.String("scheduler-name", scheduler.GetName()), errs.ZapError(err))
+		return err
+	}
 	c.cluster.GetSchedulerConfig().AddSchedulerCfg(s.Scheduler.GetType(), args)
 	return nil
 }

server/cluster/cluster.go

@@ -791,8 +791,8 @@ func (c *RaftCluster) GetSchedulerHandlers() map[string]http.Handler {
 }
 
 // AddSchedulerHandler adds a scheduler handler.
-func (c *RaftCluster) AddSchedulerHandler(scheduler schedulers.Scheduler, args ...string) error {
-	return c.coordinator.GetSchedulersController().AddSchedulerHandler(scheduler, args...)
+func (c *RaftCluster) AddSchedulerHandler(storage endpoint.ConfigStorage, scheduler schedulers.Scheduler, args ...string) error {
+	return c.coordinator.GetSchedulersController().AddSchedulerHandler(storage, scheduler, args...)
 }
 
 // RemoveSchedulerHandler removes a scheduler handler.
@@ -801,8 +801,8 @@ func (c *RaftCluster) RemoveSchedulerHandler(name string) error {
 }
 
 // AddScheduler adds a scheduler.
-func (c *RaftCluster) AddScheduler(scheduler schedulers.Scheduler, args ...string) error {
-	return c.coordinator.GetSchedulersController().AddScheduler(scheduler, args...)
+func (c *RaftCluster) AddScheduler(storage endpoint.ConfigStorage, scheduler schedulers.Scheduler, args ...string) error {
+	return c.coordinator.GetSchedulersController().AddScheduler(storage, scheduler, args...)
 }
 
 // RemoveScheduler removes a scheduler.

server/cluster/cluster_test.go

@@ -328,7 +328,7 @@ func addEvictLeaderScheduler(cluster *RaftCluster, storeID uint64) (evictSchedul
 	if err != nil {
 		return
 	}
-	if err = cluster.AddScheduler(evictScheduler, args...); err != nil {
+	if err = cluster.AddScheduler(cluster.storage, evictScheduler, args...); err != nil {
 		return
 	} else if err = cluster.opt.Persist(cluster.GetStorage()); err != nil {
 		return
@@ -3035,12 +3035,12 @@ func TestAddScheduler(t *testing.T) {
 	re.Equal(4, int(batch))
 	gls, err := schedulers.CreateScheduler(schedulers.GrantLeaderType, oc, storage.NewStorageWithMemoryBackend(), schedulers.ConfigSliceDecoder(schedulers.GrantLeaderType, []string{"0"}), controller.RemoveScheduler)
 	re.NoError(err)
-	re.NotNil(controller.AddScheduler(gls))
+	re.NotNil(controller.AddScheduler(storage.NewStorageWithMemoryBackend(), gls))
 	re.NotNil(controller.RemoveScheduler(gls.GetName()))
 
 	gls, err = schedulers.CreateScheduler(schedulers.GrantLeaderType, oc, storage.NewStorageWithMemoryBackend(), schedulers.ConfigSliceDecoder(schedulers.GrantLeaderType, []string{"1"}), controller.RemoveScheduler)
 	re.NoError(err)
-	re.NoError(controller.AddScheduler(gls))
+	re.NoError(controller.AddScheduler(storage.NewStorageWithMemoryBackend(), gls))
 
 	hb, err := schedulers.CreateScheduler(schedulers.HotRegionType, oc, storage.NewStorageWithMemoryBackend(), schedulers.ConfigJSONDecoder([]byte("{}")))
 	re.NoError(err)
@@ -3087,10 +3087,10 @@ func TestPersistScheduler(t *testing.T) {
 
 	gls1, err := schedulers.CreateScheduler(schedulers.GrantLeaderType, oc, storage, schedulers.ConfigSliceDecoder(schedulers.GrantLeaderType, []string{"1"}), controller.RemoveScheduler)
 	re.NoError(err)
-	re.NoError(controller.AddScheduler(gls1, "1"))
+	re.NoError(controller.AddScheduler(storage, gls1, "1"))
 	evict, err := schedulers.CreateScheduler(schedulers.EvictLeaderType, oc, storage, schedulers.ConfigSliceDecoder(schedulers.EvictLeaderType, []string{"2"}), controller.RemoveScheduler)
 	re.NoError(err)
-	re.NoError(controller.AddScheduler(evict, "2"))
+	re.NoError(controller.AddScheduler(storage, evict, "2"))
 	re.Len(controller.GetSchedulerNames(), defaultCount+2)
 	sches, _, err := storage.LoadAllSchedulerConfigs()
 	re.NoError(err)
@@ -3111,8 +3111,9 @@ func TestPersistScheduler(t *testing.T) {
 	// whether the schedulers added or removed in dynamic way are recorded in opt
 	_, newOpt, err := newTestScheduleConfig()
 	re.NoError(err)
-	_, err = schedulers.CreateScheduler(schedulers.ShuffleRegionType, oc, storage, schedulers.ConfigJSONDecoder([]byte("null")))
+	shuffle, err := schedulers.CreateScheduler(schedulers.ShuffleRegionType, oc, storage, schedulers.ConfigJSONDecoder([]byte("null")))
 	re.NoError(err)
+	re.NoError(controller.AddScheduler(storage, shuffle))
 	// suppose we add a new default enable scheduler
 	sc.DefaultSchedulers = append(sc.DefaultSchedulers, sc.SchedulerConfig{Type: "shuffle-region"})
 	defer func() {
@@ -3148,10 +3149,10 @@ func TestPersistScheduler(t *testing.T) {
 	re.Len(controller.GetSchedulerNames(), 3)
 	bls, err := schedulers.CreateScheduler(schedulers.BalanceLeaderType, oc, storage, schedulers.ConfigSliceDecoder(schedulers.BalanceLeaderType, []string{"", ""}))
 	re.NoError(err)
-	re.NoError(controller.AddScheduler(bls))
+	re.NoError(controller.AddScheduler(storage, bls))
 	brs, err := schedulers.CreateScheduler(schedulers.BalanceRegionType, oc, storage, schedulers.ConfigSliceDecoder(schedulers.BalanceRegionType, []string{"", ""}))
 	re.NoError(err)
-	re.NoError(controller.AddScheduler(brs))
+	re.NoError(controller.AddScheduler(storage, brs))
 	re.Len(controller.GetSchedulerNames(), defaultCount)
 
 	// the scheduler option should contain 6 items
@@ -3200,7 +3201,7 @@ func TestRemoveScheduler(t *testing.T) {
 
 	gls1, err := schedulers.CreateScheduler(schedulers.GrantLeaderType, oc, storage, schedulers.ConfigSliceDecoder(schedulers.GrantLeaderType, []string{"1"}), controller.RemoveScheduler)
 	re.NoError(err)
-	re.NoError(controller.AddScheduler(gls1, "1"))
+	re.NoError(controller.AddScheduler(storage, gls1, "1"))
 	re.Len(controller.GetSchedulerNames(), defaultCount+1)
 	sches, _, err := storage.LoadAllSchedulerConfigs()
 	re.NoError(err)

server/handler.go

@@ -226,13 +226,13 @@ func (h *Handler) AddScheduler(name string, args ...string) error {
 	}
 	log.Info("create scheduler", zap.String("scheduler-name", s.GetName()), zap.Strings("scheduler-args", args))
 	if h.s.IsAPIServiceMode() {
-		if err = c.AddSchedulerHandler(s, args...); err != nil {
+		if err = c.AddSchedulerHandler(h.s.storage, s, args...); err != nil {
 			log.Error("can not add scheduler handler", zap.String("scheduler-name", s.GetName()), zap.Strings("scheduler-args", args), errs.ZapError(err))
 			return err
 		}
 		log.Info("add scheduler handler successfully", zap.String("scheduler-name", name), zap.Strings("scheduler-args", args))
 	} else {
-		if err = c.AddScheduler(s, args...); err != nil {
+		if err = c.AddScheduler(h.s.storage, s, args...); err != nil {
 			log.Error("can not add scheduler", zap.String("scheduler-name", s.GetName()), zap.Strings("scheduler-args", args), errs.ZapError(err))
 			return err
 		}

tests/server/cluster/cluster_test.go

@@ -37,6 +37,7 @@ import (
 	"github.com/tikv/pd/pkg/mock/mockid"
 	sc "github.com/tikv/pd/pkg/schedule/config"
 	"github.com/tikv/pd/pkg/schedule/operator"
+	"github.com/tikv/pd/pkg/schedule/schedulers"
 	"github.com/tikv/pd/pkg/storage"
 	"github.com/tikv/pd/pkg/syncer"
 	"github.com/tikv/pd/pkg/tso"
@@ -47,6 +48,7 @@ import (
 	"github.com/tikv/pd/server/cluster"
 	"github.com/tikv/pd/server/config"
 	"github.com/tikv/pd/tests"
+	"github.com/tikv/pd/tests/server/api"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )
@@ -1275,6 +1277,119 @@ func TestStaleTermHeartbeat(t *testing.T) {
 	re.NoError(err)
 }
 
+func TestTransferLeaderForScheduler(t *testing.T) {
+	re := require.New(t)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	re.NoError(failpoint.Enable("github.com/tikv/pd/pkg/schedule/changeCoordinatorTicker", `return(true)`))
+	tc, err := tests.NewTestCluster(ctx, 2)
+	defer tc.Destroy()
+	re.NoError(err)
+	err = tc.RunInitialServers()
+	re.NoError(err)
+	tc.WaitLeader()
+	// start
+	leaderServer := tc.GetServer(tc.GetLeader())
+	re.NoError(leaderServer.BootstrapCluster())
+	rc := leaderServer.GetServer().GetRaftCluster()
+	re.NotNil(rc)
+
+	storesNum := 2
+	grpcPDClient := testutil.MustNewGrpcClient(re, leaderServer.GetAddr())
+	for i := 1; i <= storesNum; i++ {
+		store := &metapb.Store{
+			Id:      uint64(i),
+			Address: "127.0.0.1:" + strconv.Itoa(i),
+		}
+		resp, err := putStore(grpcPDClient, leaderServer.GetClusterID(), store)
+		re.NoError(err)
+		re.Equal(pdpb.ErrorType_OK, resp.GetHeader().GetError().GetType())
+	}
+	// region heartbeat
+	id := leaderServer.GetAllocator()
+	putRegionWithLeader(re, rc, id, 1)
+
+	time.Sleep(time.Second)
+	re.True(leaderServer.GetRaftCluster().IsPrepared())
+	// Add evict leader scheduler
+	api.MustAddScheduler(re, leaderServer.GetAddr(), schedulers.EvictLeaderName, map[string]interface{}{
+		"store_id": 1,
+	})
+	api.MustAddScheduler(re, leaderServer.GetAddr(), schedulers.EvictLeaderName, map[string]interface{}{
+		"store_id": 2,
+	})
+	// Check scheduler updated.
+	schedulersController := rc.GetCoordinator().GetSchedulersController()
+	re.Len(schedulersController.GetSchedulerNames(), 6)
+	checkEvictLeaderSchedulerExist(re, schedulersController, true)
+	checkEvictLeaderStoreIDs(re, schedulersController, []uint64{1, 2})
+
+	// transfer PD leader to another PD
+	tc.ResignLeader()
+	rc.Stop()
+	tc.WaitLeader()
+	leaderServer = tc.GetServer(tc.GetLeader())
+	rc1 := leaderServer.GetServer().GetRaftCluster()
+	rc1.Start(leaderServer.GetServer())
+	re.NoError(err)
+	re.NotNil(rc1)
+	// region heartbeat
+	id = leaderServer.GetAllocator()
+	putRegionWithLeader(re, rc1, id, 1)
+	time.Sleep(time.Second)
+	re.True(leaderServer.GetRaftCluster().IsPrepared())
+	// Check scheduler updated.
+	schedulersController = rc1.GetCoordinator().GetSchedulersController()
+	re.Len(schedulersController.GetSchedulerNames(), 6)
+	checkEvictLeaderSchedulerExist(re, schedulersController, true)
+	checkEvictLeaderStoreIDs(re, schedulersController, []uint64{1, 2})
+
+	// transfer PD leader back to the previous PD
+	tc.ResignLeader()
+	rc1.Stop()
+	tc.WaitLeader()
+	leaderServer = tc.GetServer(tc.GetLeader())
+	rc = leaderServer.GetServer().GetRaftCluster()
+	rc.Start(leaderServer.GetServer())
+	re.NotNil(rc)
+	// region heartbeat
+	id = leaderServer.GetAllocator()
+	putRegionWithLeader(re, rc, id, 1)
+	time.Sleep(time.Second)
+	re.True(leaderServer.GetRaftCluster().IsPrepared())
+	// Check scheduler updated
+	schedulersController = rc.GetCoordinator().GetSchedulersController()
+	re.Len(schedulersController.GetSchedulerNames(), 6)
+	checkEvictLeaderSchedulerExist(re, schedulersController, true)
+	checkEvictLeaderStoreIDs(re, schedulersController, []uint64{1, 2})
+
+	re.NoError(failpoint.Disable("github.com/tikv/pd/pkg/schedule/changeCoordinatorTicker"))
+}
+
+func checkEvictLeaderSchedulerExist(re *require.Assertions, sc *schedulers.Controller, exist bool) {
+	testutil.Eventually(re, func() bool {
+		if !exist {
+			return sc.GetScheduler(schedulers.EvictLeaderName) == nil
+		}
+		return sc.GetScheduler(schedulers.EvictLeaderName) != nil
+	})
+}
+
+func checkEvictLeaderStoreIDs(re *require.Assertions, sc *schedulers.Controller, expected []uint64) {
+	handler, ok := sc.GetSchedulerHandlers()[schedulers.EvictLeaderName]
+	re.True(ok)
+	h, ok := handler.(interface {
+		EvictStoreIDs() []uint64
+	})
+	re.True(ok)
+	var evictStoreIDs []uint64
+	testutil.Eventually(re, func() bool {
+		evictStoreIDs = h.EvictStoreIDs()
+		return len(evictStoreIDs) == len(expected)
+	})
+	re.ElementsMatch(evictStoreIDs, expected)
+}
+
 func putRegionWithLeader(re *require.Assertions, rc *cluster.RaftCluster, id id.Allocator, storeID uint64) {
 	for i := 0; i < 3; i++ {
 		regionID, err := id.Alloc()