support block update gc v1 safe point (tikv#6848)

ref tikv#6849

Signed-off-by: ystaticy <[email protected]>

pkg/gc/safepoint.go

@@ -18,20 +18,26 @@ import (
 	"math"
 	"time"
 
+	"github.com/pingcap/errors"
 	"github.com/tikv/pd/pkg/storage/endpoint"
 	"github.com/tikv/pd/pkg/utils/syncutil"
+	"github.com/tikv/pd/server/config"
 )
 
+var blockGCSafePointErrmsg = "don't allow update gc safe point v1."
+var blockServiceSafepointErrmsg = "don't allow update service safe point v1."
+
 // SafePointManager is the manager for safePoint of GC and services.
 type SafePointManager struct {
 	gcLock        syncutil.Mutex
 	serviceGCLock syncutil.Mutex
 	store         endpoint.GCSafePointStorage
+	cfg           config.PDServerConfig
 }
 
 // NewSafePointManager creates a SafePointManager of GC and services.
-func NewSafePointManager(store endpoint.GCSafePointStorage) *SafePointManager {
-	return &SafePointManager{store: store}
+func NewSafePointManager(store endpoint.GCSafePointStorage, cfg config.PDServerConfig) *SafePointManager {
+	return &SafePointManager{store: store, cfg: cfg}
 }
 
 // LoadGCSafePoint loads current GC safe point from storage.
@@ -49,6 +55,11 @@ func (manager *SafePointManager) UpdateGCSafePoint(newSafePoint uint64) (oldSafe
 	if err != nil {
 		return
 	}
+	if manager.cfg.BlockSafePointV1 {
+		err = errors.Errorf(blockGCSafePointErrmsg)
+		return
+	}
+
 	if oldSafePoint >= newSafePoint {
 		return
 	}
@@ -58,6 +69,9 @@ func (manager *SafePointManager) UpdateGCSafePoint(newSafePoint uint64) (oldSafe
 
 // UpdateServiceGCSafePoint update the safepoint for a specific service.
 func (manager *SafePointManager) UpdateServiceGCSafePoint(serviceID string, newSafePoint uint64, ttl int64, now time.Time) (minServiceSafePoint *endpoint.ServiceSafePoint, updated bool, err error) {
+	if manager.cfg.BlockSafePointV1 {
+		return nil, false, errors.Errorf(blockServiceSafepointErrmsg)
+	}
 	manager.serviceGCLock.Lock()
 	defer manager.serviceGCLock.Unlock()
 	minServiceSafePoint, err = manager.store.LoadMinServiceGCSafePoint(now)

pkg/gc/safepoint_test.go

@@ -23,14 +23,15 @@ import (
 	"github.com/stretchr/testify/require"
 	"github.com/tikv/pd/pkg/storage/endpoint"
 	"github.com/tikv/pd/pkg/storage/kv"
+	"github.com/tikv/pd/server/config"
 )
 
 func newGCStorage() endpoint.GCSafePointStorage {
 	return endpoint.NewStorageEndpoint(kv.NewMemoryKV(), nil)
 }
 
 func TestGCSafePointUpdateSequentially(t *testing.T) {
-	gcSafePointManager := NewSafePointManager(newGCStorage())
+	gcSafePointManager := NewSafePointManager(newGCStorage(), config.PDServerConfig{})
 	re := require.New(t)
 	curSafePoint := uint64(0)
 	// update gc safePoint with asc value.
@@ -59,7 +60,7 @@ func TestGCSafePointUpdateSequentially(t *testing.T) {
 }
 
 func TestGCSafePointUpdateCurrently(t *testing.T) {
-	gcSafePointManager := NewSafePointManager(newGCStorage())
+	gcSafePointManager := NewSafePointManager(newGCStorage(), config.PDServerConfig{})
 	maxSafePoint := uint64(1000)
 	wg := sync.WaitGroup{}
 	re := require.New(t)
@@ -83,7 +84,7 @@ func TestGCSafePointUpdateCurrently(t *testing.T) {
 
 func TestServiceGCSafePointUpdate(t *testing.T) {
 	re := require.New(t)
-	manager := NewSafePointManager(newGCStorage())
+	manager := NewSafePointManager(newGCStorage(), config.PDServerConfig{})
 	gcworkerServiceID := "gc_worker"
 	cdcServiceID := "cdc"
 	brServiceID := "br"
@@ -162,3 +163,22 @@ func TestServiceGCSafePointUpdate(t *testing.T) {
 	re.NoError(err)
 	re.True(updated)
 }
+
+func TestBlockUpdateSafePointV1(t *testing.T) {
+	re := require.New(t)
+	manager := NewSafePointManager(newGCStorage(), config.PDServerConfig{BlockSafePointV1: true})
+	gcworkerServiceID := "gc_worker"
+	gcWorkerSafePoint := uint64(8)
+
+	min, updated, err := manager.UpdateServiceGCSafePoint(gcworkerServiceID, gcWorkerSafePoint, math.MaxInt64, time.Now())
+	re.Error(err, blockServiceSafepointErrmsg)
+	re.Equal(err.Error(), blockServiceSafepointErrmsg)
+	re.False(updated)
+	re.Nil(min)
+
+	oldSafePoint, err := manager.UpdateGCSafePoint(gcWorkerSafePoint)
+	re.Error(err)
+	re.Equal(err.Error(), blockGCSafePointErrmsg)
+
+	re.Equal(uint64(0), oldSafePoint)
+}

server/config/config.go

@@ -1106,6 +1106,8 @@ type PDServerConfig struct {
 	EnableGOGCTuner bool `toml:"enable-gogc-tuner" json:"enable-gogc-tuner,string"`
 	// GCTunerThreshold is the threshold of GC tuner.
 	GCTunerThreshold float64 `toml:"gc-tuner-threshold" json:"gc-tuner-threshold"`
+	// BlockSafePointV1 is used to control gc safe point v1 and service safe point v1 can not be updated.
+	BlockSafePointV1 bool `toml:"block-safe-point-v1" json:"block-safe-point-v1,string"`
 }
 
 func (c *PDServerConfig) adjust(meta *configutil.ConfigMetaData) error {

server/server.go

@@ -452,7 +452,7 @@ func (s *Server) startServer(ctx context.Context) error {
 		return err
 	}
 
-	s.gcSafePointManager = gc.NewSafePointManager(s.storage)
+	s.gcSafePointManager = gc.NewSafePointManager(s.storage, s.cfg.PDServerCfg)
 	s.basicCluster = core.NewBasicCluster()
 	s.cluster = cluster.NewRaftCluster(ctx, s.clusterID, syncer.NewRegionSyncer(s), s.client, s.httpClient)
 	keyspaceIDAllocator := id.NewAllocator(&id.AllocatorParams{