Improve the retry of the rpc client (#26795)

Signed-off-by: SimFG <bang.fu@zilliz.com>

configs/milvus.yaml

@@ -406,10 +406,10 @@ grpc:
     dialTimeout: 200
     keepAliveTime: 10000
     keepAliveTimeout: 20000
-    maxMaxAttempts: 5
+    maxMaxAttempts: 10
-    initialBackoff: 1
+    initialBackOff: 0.2 # seconds
-    maxBackoff: 10
+    maxBackoff: 10 # seconds
-    backoffMultiplier: 2
+    backoffMultiplier: 2.0 # deprecated
   clientMaxSendSize: 268435456
   clientMaxRecvSize: 268435456
 

internal/querycoordv2/meta/collection_manager.go

@@ -19,6 +19,7 @@ package meta
 import (
 	"context"
 	"fmt"
+	"strconv"
 	"sync"
 	"time"
 
@@ -123,20 +124,25 @@ func (m *CollectionManager) Recover(broker Broker) error {
 		return err
 	}
 
+	ctx := log.WithTraceID(context.Background(), strconv.FormatInt(time.Now().UnixNano(), 10))
+	ctxLog := log.Ctx(ctx)
+	ctxLog.Info("recover collections and partitions from kv store")
+
 	for _, collection := range collections {
 		// Dropped collection should be deprecated
-		_, err = broker.GetCollectionSchema(context.Background(), collection.GetCollectionID())
+		_, err = broker.GetCollectionSchema(ctx, collection.GetCollectionID())
 		if errors.Is(err, merr.ErrCollectionNotFound) {
-			log.Info("skip dropped collection during recovery", zap.Int64("collection", collection.GetCollectionID()))
+			ctxLog.Info("skip dropped collection during recovery", zap.Int64("collection", collection.GetCollectionID()))
 			m.catalog.ReleaseCollection(collection.GetCollectionID())
 			continue
 		}
 		if err != nil {
+			ctxLog.Warn("failed to get collection schema", zap.Error(err))
 			return err
 		}
 		// Collections not loaded done should be deprecated
 		if collection.GetStatus() != querypb.LoadStatus_Loaded || collection.GetReplicaNumber() <= 0 {
-			log.Info("skip recovery and release collection",
+			ctxLog.Info("skip recovery and release collection",
 				zap.Int64("collectionID", collection.GetCollectionID()),
 				zap.String("status", collection.GetStatus().String()),
 				zap.Int32("replicaNumber", collection.GetReplicaNumber()),
@@ -150,13 +156,14 @@ func (m *CollectionManager) Recover(broker Broker) error {
 	}
 
 	for collection, partitions := range partitions {
-		existPartitions, err := broker.GetPartitions(context.Background(), collection)
+		existPartitions, err := broker.GetPartitions(ctx, collection)
 		if errors.Is(err, merr.ErrCollectionNotFound) {
-			log.Info("skip dropped collection during recovery", zap.Int64("collection", collection))
+			ctxLog.Info("skip dropped collection during recovery", zap.Int64("collection", collection))
 			m.catalog.ReleaseCollection(collection)
 			continue
 		}
 		if err != nil {
+			ctxLog.Warn("failed to get partitions", zap.Error(err))
 			return err
 		}
 		omitPartitions := make([]int64, 0)
@@ -168,7 +175,7 @@ func (m *CollectionManager) Recover(broker Broker) error {
 			return true
 		})
 		if len(omitPartitions) > 0 {
-			log.Info("skip dropped partitions during recovery",
+			ctxLog.Info("skip dropped partitions during recovery",
 				zap.Int64("collection", collection), zap.Int64s("partitions", omitPartitions))
 			m.catalog.ReleasePartition(collection, omitPartitions...)
 		}

internal/querycoordv2/meta/coordinator_broker.go

@@ -80,7 +80,7 @@ func (broker *CoordinatorBroker) GetCollectionSchema(ctx context.Context, collec
 
 	err = merr.Error(resp.GetStatus())
 	if err != nil {
-		log.Warn("failed to get collection schema", zap.Error(err))
+		log.Ctx(ctx).Warn("failed to get collection schema", zap.Error(err))
 		return nil, err
 	}
 	return resp.GetSchema(), nil

internal/querycoordv2/mocks/querynode.go

@@ -117,7 +117,9 @@ func (node *MockQueryNode) Start() error {
 		case <-node.ctx.Done():
 			return nil
 		default:
-			return &milvuspb.ComponentStates{}
+			return &milvuspb.ComponentStates{
+				Status: successStatus,
+			}
 		}
 	}, func(context.Context, *milvuspb.GetComponentStatesRequest) error {
 		select {

internal/querycoordv2/server.go

@@ -310,7 +310,7 @@ func (s *Server) initMeta() error {
 	log.Info("recover meta...")
 	err := s.meta.CollectionManager.Recover(s.broker)
 	if err != nil {
-		log.Warn("failed to recover collections")
+		log.Warn("failed to recover collections", zap.Error(err))
 		return err
 	}
 	collections := s.meta.GetAll()
@@ -323,13 +323,13 @@ func (s *Server) initMeta() error {
 
 	err = s.meta.ReplicaManager.Recover(collections)
 	if err != nil {
-		log.Warn("failed to recover replicas")
+		log.Warn("failed to recover replicas", zap.Error(err))
 		return err
 	}
 
 	err = s.meta.ResourceManager.Recover()
 	if err != nil {
-		log.Warn("failed to recover resource groups")
+		log.Warn("failed to recover resource groups", zap.Error(err))
 		return err
 	}
 

internal/querycoordv2/session/cluster_test.go

@@ -19,6 +19,7 @@ package session
 import (
 	"context"
 	"net"
+	"strconv"
 	"testing"
 	"time"
 
@@ -45,10 +46,12 @@ type ClusterTestSuite struct {
 
 func (suite *ClusterTestSuite) SetupSuite() {
 	paramtable.Init()
+	paramtable.Get().Save("grpc.client.maxMaxAttempts", "1")
 	suite.setupServers()
 }
 
 func (suite *ClusterTestSuite) TearDownSuite() {
+	paramtable.Get().Save("grpc.client.maxMaxAttempts", strconv.FormatInt(paramtable.DefaultMaxAttempts, 10))
 	for _, svr := range suite.svrs {
 		svr.GracefulStop()
 	}

internal/querynodev2/handlers.go

@@ -219,7 +219,7 @@ func (node *QueryNode) queryChannel(ctx context.Context, req *querypb.QueryReque
 	))
 
 	//
-	failRet.Status.ErrorCode = commonpb.ErrorCode_Success
+	ret.Status = merr.Status(nil)
 	latency := tr.ElapseSpan()
 	metrics.QueryNodeSQReqLatency.WithLabelValues(fmt.Sprint(paramtable.GetNodeID()), metrics.QueryLabel, metrics.Leader).Observe(float64(latency.Milliseconds()))
 	metrics.QueryNodeSQCount.WithLabelValues(fmt.Sprint(paramtable.GetNodeID()), metrics.QueryLabel, metrics.SuccessLabel, metrics.Leader).Inc()

internal/querynodev2/segments/result.go

@@ -245,7 +245,8 @@ func MergeInternalRetrieveResult(ctx context.Context, retrieveResults []*interna
 	)
 	var (
 		ret = &internalpb.RetrieveResults{
-			Ids: &schemapb.IDs{},
+			Status: merr.Status(nil),
+			Ids:    &schemapb.IDs{},
 		}
 		skipDupCnt int64
 		loopEnd    int

internal/rootcoord/root_coord.go

@@ -491,7 +491,7 @@ func (c *Core) Init() error {
 					log.Error("RootCoord start failed", zap.Error(err))
 				}
 			})
-			log.Info("RootCoord startup success")
+			log.Info("RootCoord startup success", zap.String("address", c.session.Address))
 			return err
 		}
 		c.UpdateStateCode(commonpb.StateCode_StandBy)

internal/util/grpcclient/client.go

@@ -19,22 +19,13 @@ package grpcclient
 import (
 	"context"
 	"crypto/tls"
-	"fmt"
 	"strings"
 	"sync"
 	"time"
 
+	"github.com/cockroachdb/errors"
 	grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
-	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
+	"github.com/milvus-io/milvus-proto/go-api/v2/commonpb"
-	"go.uber.org/atomic"
-	"go.uber.org/zap"
-	"golang.org/x/sync/singleflight"
-	"google.golang.org/grpc"
-	"google.golang.org/grpc/backoff"
-	"google.golang.org/grpc/credentials"
-	"google.golang.org/grpc/credentials/insecure"
-	"google.golang.org/grpc/keepalive"
-
 	"github.com/milvus-io/milvus-proto/go-api/v2/milvuspb"
 	"github.com/milvus-io/milvus/internal/util/sessionutil"
 	"github.com/milvus-io/milvus/pkg/log"
@@ -46,6 +37,15 @@ import (
 	"github.com/milvus-io/milvus/pkg/util/interceptor"
 	"github.com/milvus-io/milvus/pkg/util/merr"
 	"github.com/milvus-io/milvus/pkg/util/paramtable"
+	"github.com/milvus-io/milvus/pkg/util/retry"
+	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
+	"go.uber.org/atomic"
+	"go.uber.org/zap"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/backoff"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/keepalive"
 )
 
 // GrpcClient abstracts client of grpc
@@ -88,14 +88,11 @@ type ClientBase[T interface {
 	KeepAliveTime    time.Duration
 	KeepAliveTimeout time.Duration
 
-	MaxAttempts       int
+	MaxAttempts    int
-	InitialBackoff    float32
+	InitialBackoff float64
-	MaxBackoff        float32
+	MaxBackoff     float64
-	BackoffMultiplier float32
+	NodeID         atomic.Int64
-	NodeID            atomic.Int64
+	sess           *sessionutil.Session
-	sess              *sessionutil.Session
-
-	sf singleflight.Group
 }
 
 func NewClientBase[T interface {
@@ -109,9 +106,8 @@ func NewClientBase[T interface {
 		KeepAliveTimeout:       config.KeepAliveTimeout.GetAsDuration(time.Millisecond),
 		RetryServiceNameConfig: serviceName,
 		MaxAttempts:            config.MaxAttempts.GetAsInt(),
-		InitialBackoff:         float32(config.InitialBackoff.GetAsFloat()),
+		InitialBackoff:         config.InitialBackoff.GetAsFloat(),
-		MaxBackoff:             float32(config.MaxBackoff.GetAsFloat()),
+		MaxBackoff:             config.MaxBackoff.GetAsFloat(),
-		BackoffMultiplier:      float32(config.BackoffMultiplier.GetAsFloat()),
 		CompressionEnabled:     config.CompressionEnabled.GetAsBool(),
 	}
 }
@@ -196,18 +192,6 @@ func (c *ClientBase[T]) connect(ctx context.Context) error {
 
 	opts := tracer.GetInterceptorOpts()
 	dialContext, cancel := context.WithTimeout(ctx, c.DialTimeout)
-	// refer to https://github.com/grpc/grpc-proto/blob/master/grpc/service_config/service_config.proto
-	retryPolicy := fmt.Sprintf(`{
-		"methodConfig": [{
-		  "name": [{"service": "%s"}],
-		  "retryPolicy": {
-			  "MaxAttempts": %d,
-			  "InitialBackoff": "%fs",
-			  "MaxBackoff": "%fs",
-			  "BackoffMultiplier": %f,
-			  "RetryableStatusCodes": [ "UNAVAILABLE" ]
-		  }
-		}]}`, c.RetryServiceNameConfig, c.MaxAttempts, c.InitialBackoff, c.MaxBackoff, c.BackoffMultiplier)
 
 	var conn *grpc.ClientConn
 	compress := None
@@ -236,7 +220,6 @@ func (c *ClientBase[T]) connect(ctx context.Context) error {
 				interceptor.ClusterInjectionStreamClientInterceptor(),
 				interceptor.ServerIDInjectionStreamClientInterceptor(c.GetNodeID()),
 			)),
-			grpc.WithDefaultServiceConfig(retryPolicy),
 			grpc.WithKeepaliveParams(keepalive.ClientParameters{
 				Time:                c.KeepAliveTime,
 				Timeout:             c.KeepAliveTimeout,
@@ -254,6 +237,7 @@ func (c *ClientBase[T]) connect(ctx context.Context) error {
 			grpc.WithPerRPCCredentials(&Token{Value: crypto.Base64Encode(util.MemberCredID)}),
 			grpc.FailOnNonTempDialError(true),
 			grpc.WithReturnConnectionError(),
+			grpc.WithDisableRetry(),
 		)
 	} else {
 		conn, err = grpc.DialContext(
@@ -276,7 +260,6 @@ func (c *ClientBase[T]) connect(ctx context.Context) error {
 				interceptor.ClusterInjectionStreamClientInterceptor(),
 				interceptor.ServerIDInjectionStreamClientInterceptor(c.GetNodeID()),
 			)),
-			grpc.WithDefaultServiceConfig(retryPolicy),
 			grpc.WithKeepaliveParams(keepalive.ClientParameters{
 				Time:                c.KeepAliveTime,
 				Timeout:             c.KeepAliveTimeout,
@@ -294,6 +277,7 @@ func (c *ClientBase[T]) connect(ctx context.Context) error {
 			grpc.WithPerRPCCredentials(&Token{Value: crypto.Base64Encode(util.MemberCredID)}),
 			grpc.FailOnNonTempDialError(true),
 			grpc.WithReturnConnectionError(),
+			grpc.WithDisableRetry(),
 		)
 	}
 
@@ -311,55 +295,101 @@ func (c *ClientBase[T]) connect(ctx context.Context) error {
 	return nil
 }
 
-func (c *ClientBase[T]) callOnce(ctx context.Context, caller func(client T) (any, error)) (any, error) {
+func (c *ClientBase[T]) call(ctx context.Context, caller func(client T) (any, error)) (any, error) {
-	log := log.Ctx(ctx).With(zap.String("role", c.GetRole()))
+	log := log.Ctx(ctx).With(zap.String("client_role", c.GetRole()))
-	client, err := c.GetGrpcClient(ctx)
+	var (
-	if err != nil {
+		ret       any
-		return generic.Zero[T](), err
+		clientErr error
+		callErr   error
+		client    T
+	)
+
+	client, clientErr = c.GetGrpcClient(ctx)
+	if clientErr != nil {
+		log.Warn("fail to get grpc client", zap.Error(clientErr))
 	}
 
-	ret, err := caller(client)
+	resetClientFunc := func() {
-	if err == nil {
+		c.resetConnection(client)
-		return ret, nil
+		client, clientErr = c.GetGrpcClient(ctx)
+		if clientErr != nil {
+			log.Warn("fail to get grpc client in the retry state", zap.Error(clientErr))
+		}
 	}
 
-	if IsCrossClusterRoutingErr(err) {
+	innerCtx, cancel := context.WithCancel(ctx)
-		log.Warn("CrossClusterRoutingErr, start to reset connection", zap.Error(err))
+	defer cancel()
-		c.resetConnection(client)
+	_ = retry.Do(innerCtx, func() error {
-		return ret, merr.ErrServiceUnavailable // For concealing ErrCrossClusterRouting from the client
+		if generic.IsZero(client) {
-	}
+			callErr = errors.Wrap(clientErr, "empty grpc client")
-	if IsServerIDMismatchErr(err) {
+			log.Warn("grpc client is nil, maybe fail to get client in the retry state")
-		log.Warn("Server ID mismatch, start to reset connection", zap.Error(err))
+			resetClientFunc()
-		c.resetConnection(client)
+			return callErr
-		return ret, err
+		}
-	}
+		ret, callErr = caller(client)
-	if !funcutil.CheckCtxValid(ctx) {
+		if callErr != nil {
-		// check if server ID matches coord session, if not, reset connection
+			if funcutil.IsGrpcErr(callErr) ||
-		if c.sess != nil {
+				IsCrossClusterRoutingErr(callErr) || IsServerIDMismatchErr(callErr) {
-			sessions, _, getSessionErr := c.sess.GetSessions(c.GetRole())
+				log.Warn("start to reset connection because of specific reasons", zap.Error(callErr))
-			if getSessionErr != nil {
+				resetClientFunc()
-				// Only log but not handle this error as it is an auxiliary logic
+				return callErr
-				log.Warn("Fail to GetSessions", zap.Error(getSessionErr))
 			}
-			if coordSess, exist := sessions[c.GetRole()]; exist {
+			if !funcutil.CheckCtxValid(ctx) {
-				if c.GetNodeID() != coordSess.ServerID {
+				if c.sess != nil {
-					log.Warn("Server ID mismatch, may connected to a old server, start to reset connection", zap.Error(err))
+					sessions, _, getSessionErr := c.sess.GetSessions(c.GetRole())
-					c.resetConnection(client)
+					if getSessionErr != nil {
-					return ret, err
+						// Only log but not handle this error as it is an auxiliary logic
+						log.Warn("fail to get session", zap.Error(getSessionErr))
+					}
+					if coordSess, exist := sessions[c.GetRole()]; exist {
+						if c.GetNodeID() != coordSess.ServerID {
+							log.Warn("server id mismatch, may connected to a old server, start to reset connection",
+								zap.Int64("client_node", c.GetNodeID()), zap.Int64("current_node", coordSess.ServerID))
+							resetClientFunc()
+							return callErr
+						}
+					}
 				}
 			}
+			log.Warn("fail to grpc call because of unknown error", zap.Error(callErr))
+			// not rpc error, it will stop to retry
+			return retry.Unrecoverable(callErr)
 		}
-		// start bg check in case of https://github.com/milvus-io/milvus/issues/22435
+
-		go c.bgHealthCheck(client)
+		var status *commonpb.Status
-		return generic.Zero[T](), err
+		switch res := ret.(type) {
+		case *commonpb.Status:
+			status = res
+		case interface{ GetStatus() *commonpb.Status }:
+			status = res.GetStatus()
+		default:
+			// it will directly return the result
+			log.Warn("unknown return type", zap.Any("return", ret))
+			return nil
+		}
+
+		if merr.Ok(status) || !merr.IsRetryableCode(status.GetCode()) {
+			return nil
+		}
+
+		return errors.Newf("error code: %d, reason: %s", status.GetCode(), status.GetReason())
+	}, retry.Attempts(uint(c.MaxAttempts)),
+		// Because the previous InitialBackoff and MaxBackoff were float, and the unit was s.
+		// For compatibility, this is multiplied by 1000.
+		retry.Sleep(time.Duration(c.InitialBackoff*1000)*time.Millisecond),
+		retry.MaxSleepTime(time.Duration(c.MaxBackoff*1000)*time.Millisecond))
+	// default value list: MaxAttempts 10, InitialBackoff 0.2s, MaxBackoff 10s
+	// and consume 52.8s if all retry failed
+
+	if callErr != nil {
+		// make the error more friendly to user
+		if IsCrossClusterRoutingErr(callErr) {
+			callErr = merr.ErrServiceUnavailable
+		}
+
+		return generic.Zero[T](), callErr
 	}
-	if !funcutil.IsGrpcErr(err) {
+	return ret, nil
-		log.Warn("ClientBase:isNotGrpcErr", zap.Error(err))
-		return generic.Zero[T](), err
-	}
-	log.Info("ClientBase grpc error, start to reset connection", zap.Error(err))
-	c.resetConnection(client)
-	return ret, err
 }
 
 // Call does a grpc call
@@ -368,10 +398,10 @@ func (c *ClientBase[T]) Call(ctx context.Context, caller func(client T) (any, er
 		return generic.Zero[T](), ctx.Err()
 	}
 
-	ret, err := c.callOnce(ctx, caller)
+	ret, err := c.call(ctx, caller)
 	if err != nil {
-		traceErr := fmt.Errorf("err: %w\n, %s", err, tracer.StackTrace())
+		traceErr := errors.Wrapf(err, "stack trace: %s", tracer.StackTrace())
-		log.Ctx(ctx).Warn("ClientBase Call grpc first call get error",
+		log.Ctx(ctx).Warn("ClientBase Call grpc call get error",
 			zap.String("role", c.GetRole()),
 			zap.String("address", c.GetAddr()),
 			zap.Error(traceErr),
@@ -383,44 +413,8 @@ func (c *ClientBase[T]) Call(ctx context.Context, caller func(client T) (any, er
 
 // ReCall does the grpc call twice
 func (c *ClientBase[T]) ReCall(ctx context.Context, caller func(client T) (any, error)) (any, error) {
-	if !funcutil.CheckCtxValid(ctx) {
+	// All retry operations are done in `call` function.
-		return generic.Zero[T](), ctx.Err()
+	return c.Call(ctx, caller)
-	}
-
-	ret, err := c.callOnce(ctx, caller)
-	if err == nil {
-		return ret, nil
-	}
-
-	log := log.Ctx(ctx).With(zap.String("role", c.GetRole()), zap.String("address", c.GetAddr()))
-	traceErr := fmt.Errorf("err: %w\n, %s", err, tracer.StackTrace())
-	log.Warn("ClientBase ReCall grpc first call get error ", zap.Error(traceErr))
-
-	if !funcutil.CheckCtxValid(ctx) {
-		return generic.Zero[T](), ctx.Err()
-	}
-
-	ret, err = c.callOnce(ctx, caller)
-	if err != nil {
-		traceErr = fmt.Errorf("err: %w\n, %s", err, tracer.StackTrace())
-		log.Warn("ClientBase ReCall grpc second call get error", zap.Error(traceErr))
-		return generic.Zero[T](), traceErr
-	}
-	return ret, err
-}
-
-func (c *ClientBase[T]) bgHealthCheck(client T) {
-	c.sf.Do("healthcheck", func() (any, error) {
-		ctx, cancel := context.WithTimeout(context.Background(), paramtable.Get().CommonCfg.SessionTTL.GetAsDuration(time.Second))
-		defer cancel()
-
-		_, err := client.GetComponentStates(ctx, &milvuspb.GetComponentStatesRequest{})
-		if err != nil {
-			c.resetConnection(client)
-		}
-
-		return struct{}{}, nil
-	})
 }
 
 // Close close the client connection

internal/util/grpcclient/client_test.go

@@ -23,11 +23,11 @@ import (
 	"net"
 	"os"
 	"strings"
-	"sync"
 	"testing"
 	"time"
 
 	"github.com/cockroachdb/errors"
+	"github.com/milvus-io/milvus/pkg/util/merr"
 
 	"google.golang.org/grpc/examples/helloworld/helloworld"
 	"google.golang.org/grpc/keepalive"
@@ -106,11 +106,18 @@ func testCall(t *testing.T, compressed bool) {
 	// mock client with nothing
 	base := ClientBase[*mockClient]{}
 	base.CompressionEnabled = compressed
-	base.grpcClientMtx.Lock()
+	initClient := func() {
-	base.grpcClient = &mockClient{}
+		base.grpcClientMtx.Lock()
-	base.grpcClientMtx.Unlock()
+		base.grpcClient = &mockClient{}
+		base.grpcClientMtx.Unlock()
+	}
+	base.MaxAttempts = 1
+	base.SetGetAddrFunc(func() (string, error) {
+		return "", errors.New("mocked address error")
+	})
 
 	t.Run("Call normal return", func(t *testing.T) {
+		initClient()
 		_, err := base.Call(context.Background(), func(client *mockClient) (any, error) {
 			return struct{}{}, nil
 		})
@@ -118,6 +125,7 @@ func testCall(t *testing.T, compressed bool) {
 	})
 
 	t.Run("Call with canceled context", func(t *testing.T) {
+		initClient()
 		ctx, cancel := context.WithCancel(context.Background())
 		cancel()
 		_, err := base.Call(ctx, func(client *mockClient) (any, error) {
@@ -128,22 +136,7 @@ func testCall(t *testing.T, compressed bool) {
 	})
 
 	t.Run("Call canceled in caller func", func(t *testing.T) {
-		ctx, cancel := context.WithCancel(context.Background())
+		initClient()
-		errMock := errors.New("mocked")
-		_, err := base.Call(ctx, func(client *mockClient) (any, error) {
-			cancel()
-			return nil, errMock
-		})
-
-		assert.Error(t, err)
-		assert.True(t, errors.Is(err, errMock))
-		base.grpcClientMtx.RLock()
-		// client shall not be reset
-		assert.NotNil(t, base.grpcClient)
-		base.grpcClientMtx.RUnlock()
-	})
-
-	t.Run("Call canceled in caller func", func(t *testing.T) {
 		ctx, cancel := context.WithCancel(context.Background())
 		errMock := errors.New("mocked")
 		_, err := base.Call(ctx, func(client *mockClient) (any, error) {
@@ -160,6 +153,7 @@ func testCall(t *testing.T, compressed bool) {
 	})
 
 	t.Run("Call returns non-grpc error", func(t *testing.T) {
+		initClient()
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
 		errMock := errors.New("mocked")
@@ -176,6 +170,7 @@ func testCall(t *testing.T, compressed bool) {
 	})
 
 	t.Run("Call returns grpc error", func(t *testing.T) {
+		initClient()
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
 		errGrpc := status.Error(codes.Unknown, "mocked")
@@ -211,11 +206,18 @@ func testCall(t *testing.T, compressed bool) {
 func TestClientBase_Recall(t *testing.T) {
 	// mock client with nothing
 	base := ClientBase[*mockClient]{}
-	base.grpcClientMtx.Lock()
+	initClient := func() {
-	base.grpcClient = &mockClient{}
+		base.grpcClientMtx.Lock()
-	base.grpcClientMtx.Unlock()
+		base.grpcClient = &mockClient{}
+		base.grpcClientMtx.Unlock()
+	}
+	base.MaxAttempts = 1
+	base.SetGetAddrFunc(func() (string, error) {
+		return "", errors.New("mocked address error")
+	})
 
 	t.Run("Recall normal return", func(t *testing.T) {
+		initClient()
 		_, err := base.ReCall(context.Background(), func(client *mockClient) (any, error) {
 			return struct{}{}, nil
 		})
@@ -223,6 +225,7 @@ func TestClientBase_Recall(t *testing.T) {
 	})
 
 	t.Run("ReCall with canceled context", func(t *testing.T) {
+		initClient()
 		ctx, cancel := context.WithCancel(context.Background())
 		cancel()
 		_, err := base.ReCall(ctx, func(client *mockClient) (any, error) {
@@ -232,24 +235,8 @@ func TestClientBase_Recall(t *testing.T) {
 		assert.True(t, errors.Is(err, context.Canceled))
 	})
 
-	t.Run("ReCall fails first and success second", func(t *testing.T) {
-		ctx, cancel := context.WithCancel(context.Background())
-		defer cancel()
-		flag := false
-		var mut sync.Mutex
-		_, err := base.ReCall(ctx, func(client *mockClient) (any, error) {
-			mut.Lock()
-			defer mut.Unlock()
-			if flag {
-				return struct{}{}, nil
-			}
-			flag = true
-			return nil, errors.New("mock first")
-		})
-		assert.NoError(t, err)
-	})
-
 	t.Run("ReCall canceled in caller func", func(t *testing.T) {
+		initClient()
 		ctx, cancel := context.WithCancel(context.Background())
 		errMock := errors.New("mocked")
 		_, err := base.ReCall(ctx, func(client *mockClient) (any, error) {
@@ -258,7 +245,7 @@ func TestClientBase_Recall(t *testing.T) {
 		})
 
 		assert.Error(t, err)
-		assert.True(t, errors.Is(err, context.Canceled))
+		assert.True(t, errors.Is(err, errMock))
 		base.grpcClientMtx.RLock()
 		// client shall not be reset
 		assert.NotNil(t, base.grpcClient)
@@ -314,7 +301,7 @@ func TestClientBase_RetryPolicy(t *testing.T) {
 		Timeout: 60 * time.Second,
 	}
 
-	maxAttempts := 5
+	maxAttempts := 1
 	s := grpc.NewServer(
 		grpc.KeepaliveEnforcementPolicy(kaep),
 		grpc.KeepaliveParams(kasp),
@@ -338,7 +325,6 @@ func TestClientBase_RetryPolicy(t *testing.T) {
 		MaxAttempts:            maxAttempts,
 		InitialBackoff:         10.0,
 		MaxBackoff:             60.0,
-		BackoffMultiplier:      2.0,
 	}
 	clientBase.SetRole(typeutil.DataCoordRole)
 	clientBase.SetGetAddrFunc(func() (string, error) {
@@ -352,9 +338,12 @@ func TestClientBase_RetryPolicy(t *testing.T) {
 	ctx := context.Background()
 	randID := rand.Int63()
 	res, err := clientBase.Call(ctx, func(client rootcoordpb.RootCoordClient) (any, error) {
-		return &milvuspb.ComponentStates{State: &milvuspb.ComponentInfo{
+		return &milvuspb.ComponentStates{
-			NodeID: randID,
+			State: &milvuspb.ComponentInfo{
-		}}, nil
+				NodeID: randID,
+			},
+			Status: merr.Status(nil),
+		}, nil
 	})
 	assert.NoError(t, err)
 	assert.Equal(t, res.(*milvuspb.ComponentStates).GetState().GetNodeID(), randID)
@@ -375,7 +364,7 @@ func TestClientBase_Compression(t *testing.T) {
 		Timeout: 60 * time.Second,
 	}
 
-	maxAttempts := 5
+	maxAttempts := 1
 	s := grpc.NewServer(
 		grpc.KeepaliveEnforcementPolicy(kaep),
 		grpc.KeepaliveParams(kasp),
@@ -399,7 +388,6 @@ func TestClientBase_Compression(t *testing.T) {
 		MaxAttempts:            maxAttempts,
 		InitialBackoff:         10.0,
 		MaxBackoff:             60.0,
-		BackoffMultiplier:      2.0,
 		CompressionEnabled:     true,
 	}
 	clientBase.SetRole(typeutil.DataCoordRole)
@@ -414,9 +402,12 @@ func TestClientBase_Compression(t *testing.T) {
 	ctx := context.Background()
 	randID := rand.Int63()
 	res, err := clientBase.Call(ctx, func(client rootcoordpb.RootCoordClient) (any, error) {
-		return &milvuspb.ComponentStates{State: &milvuspb.ComponentInfo{
+		return &milvuspb.ComponentStates{
-			NodeID: randID,
+			State: &milvuspb.ComponentInfo{
-		}}, nil
+				NodeID: randID,
+			},
+			Status: merr.Status(nil),
+		}, nil
 	})
 	assert.NoError(t, err)
 	assert.Equal(t, res.(*milvuspb.ComponentStates).GetState().GetNodeID(), randID)

pkg/go.sum

@@ -211,6 +211,7 @@ github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre
 github.com/go-martini/martini v0.0.0-20170121215854-22fa46961aab/go.mod h1:/P9AEU963A2AYjv4d1V5eVL1CQbEJq6aCNHDDjibzu8=
 github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
 github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
+github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
 github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee/go.mod h1:L0fX3K22YWvt/FAX9NnzrNzcI4wNYi9Yku4O0LKYflo=

pkg/util/merr/errors.go

@@ -22,7 +22,7 @@ import (
 )
 
 const (
-	retriableFlag       = 1 << 16
+	retryableFlag       = 1 << 16
 	CanceledCode  int32 = 10000
 	TimeoutCode   int32 = 10001
 )
@@ -124,7 +124,7 @@ type milvusError struct {
 
 func newMilvusError(msg string, code int32, retriable bool) milvusError {
 	if retriable {
-		code |= retriableFlag
+		code |= retryableFlag
 	}
 	return milvusError{
 		msg:     msg,

pkg/util/merr/utils.go

@@ -56,8 +56,12 @@ func Code(err error) int32 {
 	}
 }
 
-func IsRetriable(err error) bool {
+func IsRetryableErr(err error) bool {
-	return Code(err)&retriableFlag != 0
+	return IsRetryableCode(Code(err))
+}
+
+func IsRetryableCode(code int32) bool {
+	return code&retryableFlag != 0
 }
 
 func IsCanceledOrTimeout(err error) bool {
@@ -130,7 +134,7 @@ func Error(status *commonpb.Status) error {
 		return newMilvusError(fmt.Sprintf("legacy error code:%d, reason: %s", status.GetErrorCode(), status.GetReason()), errUnexpected.errCode, false)
 	}
 
-	return newMilvusError(status.GetReason(), code, code&retriableFlag != 0)
+	return newMilvusError(status.GetReason(), code, code&retryableFlag != 0)
 }
 
 // CheckHealthy checks whether the state is healthy,

pkg/util/paramtable/grpc_param.go

@@ -43,12 +43,10 @@ const (
 	DefaultKeepAliveTimeout = 20000
 
 	// Grpc retry policy
-	DefaultMaxAttempts               = 5
+	DefaultMaxAttempts                = 10
-	DefaultInitialBackoff    float64 = 1.0
+	DefaultInitialBackoff     float64 = 0.2
-	DefaultMaxBackoff        float64 = 10.0
+	DefaultMaxBackoff         float64 = 10
-	DefaultBackoffMultiplier float64 = 2.0
+	DefaultCompressionEnabled bool    = false
-
-	DefaultCompressionEnabled bool = false
 
 	ProxyInternalPort = 19529
 	ProxyExternalPort = 19530
@@ -194,10 +192,9 @@ type GrpcClientConfig struct {
 	KeepAliveTime    ParamItem `refreshable:"false"`
 	KeepAliveTimeout ParamItem `refreshable:"false"`
 
-	MaxAttempts       ParamItem `refreshable:"false"`
+	MaxAttempts    ParamItem `refreshable:"false"`
-	InitialBackoff    ParamItem `refreshable:"false"`
+	InitialBackoff ParamItem `refreshable:"false"`
-	MaxBackoff        ParamItem `refreshable:"false"`
+	MaxBackoff     ParamItem `refreshable:"false"`
-	BackoffMultiplier ParamItem `refreshable:"false"`
 }
 
 func (p *GrpcClientConfig) Init(domain string, base *BaseTable) {
@@ -318,19 +315,13 @@ func (p *GrpcClientConfig) Init(domain string, base *BaseTable) {
 			if v == "" {
 				return maxAttempts
 			}
-			iv, err := strconv.Atoi(v)
+			_, err := strconv.Atoi(v)
 			if err != nil {
 				log.Warn("Failed to convert int when parsing grpc.client.maxMaxAttempts, set to default",
 					zap.String("role", p.Domain),
 					zap.String("grpc.client.maxMaxAttempts", v))
 				return maxAttempts
 			}
-			if iv < 2 || iv > 5 {
-				log.Warn("The value of %s should be greater than 1 and less than 6, set to default",
-					zap.String("role", p.Domain),
-					zap.String("grpc.client.maxMaxAttempts", v))
-				return maxAttempts
-			}
 			return v
 		},
 		Export: true,
@@ -345,7 +336,7 @@ func (p *GrpcClientConfig) Init(domain string, base *BaseTable) {
 			if v == "" {
 				return initialBackoff
 			}
-			_, err := strconv.Atoi(v)
+			_, err := strconv.ParseFloat(v, 64)
 			if err != nil {
 				log.Warn("Failed to convert int when parsing grpc.client.initialBackoff, set to default",
 					zap.String("role", p.Domain),
@@ -379,27 +370,6 @@ func (p *GrpcClientConfig) Init(domain string, base *BaseTable) {
 	}
 	p.MaxBackoff.Init(base.mgr)
 
-	backoffMultiplier := fmt.Sprintf("%f", DefaultBackoffMultiplier)
-	p.BackoffMultiplier = ParamItem{
-		Key:     "grpc.client.backoffMultiplier",
-		Version: "2.0.0",
-		Formatter: func(v string) string {
-			if v == "" {
-				return backoffMultiplier
-			}
-			_, err := strconv.ParseFloat(v, 64)
-			if err != nil {
-				log.Warn("Failed to convert int when parsing grpc.client.backoffMultiplier, set to default",
-					zap.String("role", p.Domain),
-					zap.String("grpc.client.backoffMultiplier", v))
-				return backoffMultiplier
-			}
-			return v
-		},
-		Export: true,
-	}
-	p.BackoffMultiplier.Init(base.mgr)
-
 	compressionEnabled := fmt.Sprintf("%t", DefaultCompressionEnabled)
 	p.CompressionEnabled = ParamItem{
 		Key:     "grpc.client.compressionEnabled",
@@ -413,7 +383,7 @@ func (p *GrpcClientConfig) Init(domain string, base *BaseTable) {
 				log.Warn("Failed to convert int when parsing grpc.client.compressionEnabled, set to default",
 					zap.String("role", p.Domain),
 					zap.String("grpc.client.compressionEnabled", v))
-				return backoffMultiplier
+				return compressionEnabled
 			}
 			return v
 		},

pkg/util/paramtable/grpc_param_test.go

@@ -122,15 +122,14 @@ func TestGrpcClientParams(t *testing.T) {
 	assert.Equal(t, clientConfig.MaxAttempts.GetAsInt(), DefaultMaxAttempts)
 	base.Save("grpc.client.maxMaxAttempts", "a")
 	assert.Equal(t, clientConfig.MaxAttempts.GetAsInt(), DefaultMaxAttempts)
-	base.Save("grpc.client.maxMaxAttempts", "1")
-	assert.Equal(t, clientConfig.MaxAttempts.GetAsInt(), DefaultMaxAttempts)
-	base.Save("grpc.client.maxMaxAttempts", "10")
-	assert.Equal(t, clientConfig.MaxAttempts.GetAsInt(), DefaultMaxAttempts)
 	base.Save("grpc.client.maxMaxAttempts", "4")
 	assert.Equal(t, clientConfig.MaxAttempts.GetAsInt(), 4)
 
+	assert.Equal(t, clientConfig.InitialBackoff.GetAsFloat(), DefaultInitialBackoff)
 	base.Save("grpc.client.initialBackOff", "a")
+	assert.Equal(t, clientConfig.InitialBackoff.GetAsFloat(), DefaultInitialBackoff)
 	base.Save("grpc.client.initialBackOff", "2.0")
+	assert.Equal(t, clientConfig.InitialBackoff.GetAsFloat(), 2.0)
 
 	assert.Equal(t, clientConfig.MaxBackoff.GetAsFloat(), DefaultMaxBackoff)
 	base.Save("grpc.client.maxBackOff", "a")
@@ -138,12 +137,6 @@ func TestGrpcClientParams(t *testing.T) {
 	base.Save("grpc.client.maxBackOff", "50.0")
 	assert.Equal(t, clientConfig.MaxBackoff.GetAsFloat(), 50.0)
 
-	assert.Equal(t, clientConfig.BackoffMultiplier.GetAsFloat(), DefaultBackoffMultiplier)
-	base.Save("grpc.client.backoffMultiplier", "a")
-	assert.Equal(t, clientConfig.BackoffMultiplier.GetAsFloat(), DefaultBackoffMultiplier)
-	base.Save("grpc.client.backoffMultiplier", "3.0")
-	assert.Equal(t, clientConfig.BackoffMultiplier.GetAsFloat(), 3.0)
-
 	assert.Equal(t, clientConfig.CompressionEnabled.GetAsBool(), DefaultCompressionEnabled)
 	base.Save("grpc.client.CompressionEnabled", "a")
 	assert.Equal(t, clientConfig.CompressionEnabled.GetAsBool(), DefaultCompressionEnabled)

pkg/util/retry/retry.go

@@ -38,7 +38,7 @@ func Do(ctx context.Context, fn func() error, opts ...Option) error {
 
 	for i := uint(0); i < c.attempts; i++ {
 		if err := fn(); err != nil {
-			if i%10 == 0 {
+			if i%4 == 0 {
 				log.Error("retry func failed", zap.Uint("retry time", i), zap.Error(err))
 			}
 

tests/integration/crossclusterrouting/cross_cluster_routing_test.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"fmt"
 	"math/rand"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -88,10 +89,13 @@ func (s *CrossClusterRoutingSuite) SetupSuite() {
 	rand.Seed(time.Now().UnixNano())
 
 	paramtable.Init()
+
+	paramtable.Get().Save("grpc.client.maxMaxAttempts", "1")
 	s.factory = dependency.NewDefaultFactory(true)
 }
 
 func (s *CrossClusterRoutingSuite) TearDownSuite() {
+	paramtable.Get().Save("grpc.client.maxMaxAttempts", strconv.FormatInt(paramtable.DefaultMaxAttempts, 10))
 }
 
 func (s *CrossClusterRoutingSuite) SetupTest() {