kv/client: add global grpc connection pool

cdc/capture.go

@@ -29,7 +29,6 @@ import (
 	cdcContext "github.com/pingcap/ticdc/pkg/context"
 	cerror "github.com/pingcap/ticdc/pkg/errors"
 	"github.com/pingcap/ticdc/pkg/orchestrator"
-	"github.com/pingcap/ticdc/pkg/security"
 	"github.com/pingcap/ticdc/pkg/util"
 	"github.com/pingcap/ticdc/pkg/version"
 	tidbkv "github.com/pingcap/tidb/kv"
@@ -49,7 +48,7 @@ type Capture struct {
 	etcdClient kv.CDCEtcdClient
 	pdCli      pd.Client
 	kvStorage  tidbkv.Storage
-	credential *security.Credential
+	grpcPool   kv.GrpcPool
 
 	processorManager *processor.Manager
 
@@ -121,12 +120,13 @@ func NewCapture(
 		Version:       version.ReleaseVersion,
 	}
 	processorManager := processor.NewManager()
+	grpcPool := kv.NewGrpcPoolImpl(stdCtx, credential)
 	log.Info("creating capture", zap.String("capture-id", id), util.ZapFieldCapture(stdCtx))
 
 	c = &Capture{
 		processors:       make(map[string]*oldProcessor),
 		etcdClient:       cli,
-		credential:       credential,
+		grpcPool:         grpcPool,
 		session:          sess,
 		election:         elec,
 		info:             info,
@@ -183,6 +183,10 @@ func (c *Capture) Run(ctx context.Context) (err error) {
 			return errors.Trace(err)
 		}
 	} else {
+		defer c.grpcPool.Close()
+		go func() {
+			c.grpcPool.RecycleConn(ctx)
+		}()
 		taskWatcher := NewTaskWatcher(c, &TaskWatcherConfig{
 			Prefix:      kv.TaskStatusKeyPrefix + "/" + c.info.ID,
 			ChannelSize: 128,
@@ -266,6 +270,10 @@ func (c *Capture) Close(ctx context.Context) error {
 		case <-c.closed:
 		case <-ctx.Done():
 		}
+	} else {
+		if c.grpcPool != nil {
+			c.grpcPool.Close()
+		}
 	}
 	return errors.Trace(c.etcdClient.DeleteCaptureInfo(ctx, c.info.ID))
 }
@@ -310,7 +318,7 @@ func (c *Capture) assignTask(ctx context.Context, task *Task) (*oldProcessor, er
 		zap.String("changefeed", task.ChangeFeedID))
 	conf := config.GetGlobalServerConfig()
 	p, err := runProcessorImpl(
-		ctx, c.pdCli, c.credential, c.session, *cf, task.ChangeFeedID, *c.info, task.CheckpointTS, time.Duration(conf.ProcessorFlushInterval))
+		ctx, c.pdCli, c.grpcPool, c.session, *cf, task.ChangeFeedID, *c.info, task.CheckpointTS, time.Duration(conf.ProcessorFlushInterval))
 	if err != nil {
 		log.Error("run processor failed",
 			zap.String("changefeed", task.ChangeFeedID),

cdc/capture/capture.go

@@ -57,6 +57,7 @@ type Capture struct {
 	pdClient   pd.Client
 	kvStorage  tidbkv.Storage
 	etcdClient *kv.CDCEtcdClient
+	grpcPool   kv.GrpcPool
 
 	cancel context.CancelFunc
 
@@ -77,7 +78,7 @@ func NewCapture(pdClient pd.Client, kvStorage tidbkv.Storage, etcdClient *kv.CDC
 	}
 }
 
-func (c *Capture) reset() error {
+func (c *Capture) reset(ctx context.Context) error {
 	c.captureMu.Lock()
 	defer c.captureMu.Unlock()
 	conf := config.GetGlobalServerConfig()
@@ -97,6 +98,10 @@ func (c *Capture) reset() error {
 	}
 	c.session = sess
 	c.election = concurrency.NewElection(sess, kv.CaptureOwnerKey)
+	if c.grpcPool != nil {
+		c.grpcPool.Close()
+	}
+	c.grpcPool = kv.NewGrpcPoolImpl(ctx, conf.Security)
 	log.Info("init capture", zap.String("capture-id", c.info.ID), zap.String("capture-addr", c.info.AdvertiseAddr))
 	return nil
 }
@@ -121,7 +126,7 @@ func (c *Capture) Run(ctx context.Context) error {
 			}
 			return errors.Trace(err)
 		}
-		err = c.reset()
+		err = c.reset(ctx)
 		if err != nil {
 			return errors.Trace(err)
 		}
@@ -145,6 +150,7 @@ func (c *Capture) run(stdCtx context.Context) error {
 		KVStorage:   c.kvStorage,
 		CaptureInfo: c.info,
 		EtcdClient:  c.etcdClient,
+		GrpcPool:    c.grpcPool,
 	})
 	err := c.register(ctx)
 	if err != nil {
@@ -158,7 +164,7 @@ func (c *Capture) run(stdCtx context.Context) error {
 		cancel()
 	}()
 	wg := new(sync.WaitGroup)
-	wg.Add(2)
+	wg.Add(3)
 	var ownerErr, processorErr error
 	go func() {
 		defer wg.Done()
@@ -180,6 +186,10 @@ func (c *Capture) run(stdCtx context.Context) error {
 		processorErr = c.runEtcdWorker(ctx, c.processorManager, model.NewGlobalState(), processorFlushInterval)
 		log.Info("the processor routine has exited", zap.Error(processorErr))
 	}()
+	go func() {
+		defer wg.Done()
+		c.grpcPool.RecycleConn(ctx)
+	}()
 	wg.Wait()
 	if ownerErr != nil {
 		return errors.Annotate(ownerErr, "owner exited with error")
@@ -336,6 +346,9 @@ func (c *Capture) AsyncClose() {
 	if c.processorManager != nil {
 		c.processorManager.AsyncClose()
 	}
+	if c.grpcPool != nil {
+		c.grpcPool.Close()
+	}
 }
 
 // WriteDebugInfo writes the debug info into writer.

cdc/capture_test.go

@@ -27,7 +27,6 @@ import (
 	"github.com/pingcap/ticdc/pkg/config"
 	cerror "github.com/pingcap/ticdc/pkg/errors"
 	"github.com/pingcap/ticdc/pkg/etcd"
-	"github.com/pingcap/ticdc/pkg/security"
 	"github.com/pingcap/ticdc/pkg/util"
 	"github.com/pingcap/ticdc/pkg/util/testleak"
 	pd "github.com/tikv/pd/client"
@@ -121,7 +120,7 @@ func (s *captureSuite) TestCaptureSessionDoneDuringHandleTask(c *check.C) {
 	}()
 	runProcessorBackup := runProcessorImpl
 	runProcessorImpl = func(
-		ctx context.Context, _ pd.Client, _ *security.Credential,
+		ctx context.Context, _ pd.Client, grpcPool kv.GrpcPool,
 		session *concurrency.Session, info model.ChangeFeedInfo, changefeedID string,
 		captureInfo model.CaptureInfo, checkpointTs uint64, flushCheckpointInterval time.Duration,
 	) (*oldProcessor, error) {