diff --git a/plugin/storage/factory_config.go b/plugin/storage/factory_config.go
index 9807c8fa524..aaa40cd7256 100644
--- a/plugin/storage/factory_config.go
+++ b/plugin/storage/factory_config.go
@@ -68,6 +68,9 @@ func FactoryConfigFromEnvAndCLI(args []string, log io.Writer) FactoryConfig {
 		depStorageType = spanWriterTypes[0]
 	}
 	samplingStorageType := os.Getenv(SamplingStorageTypeEnvVar)
+	if samplingStorageType == "" {
+		samplingStorageType = cassandraStorageType
+	}
 	// TODO support explicit configuration for readers
 	return FactoryConfig{
 		SpanWriterTypes:         spanWriterTypes,
diff --git a/plugin/storage/grpc/factory.go b/plugin/storage/grpc/factory.go
index 28edfa6f2ae..ccaa35b3542 100644
--- a/plugin/storage/grpc/factory.go
+++ b/plugin/storage/grpc/factory.go
@@ -30,6 +30,7 @@ import (
 	"github.com/jaegertracing/jaeger/plugin/storage/grpc/shared"
 	"github.com/jaegertracing/jaeger/storage"
 	"github.com/jaegertracing/jaeger/storage/dependencystore"
+	"github.com/jaegertracing/jaeger/storage/samplingstore"
 	"github.com/jaegertracing/jaeger/storage/spanstore"
 	"github.com/jaegertracing/jaeger/storage/spanstore/spanstoremetrics"
 )
@@ -161,6 +162,7 @@ func (f *Factory) newRemoteStorage(
 			Store:               grpcClient,
 			ArchiveStore:        grpcClient,
 			StreamingSpanWriter: grpcClient,
+			SamplingStore:       grpcClient,
 		},
 		Capabilities: grpcClient,
 	}, nil
@@ -230,6 +232,10 @@ func (f *Factory) CreateArchiveSpanWriter() (spanstore.Writer, error) {
 	return f.services.ArchiveStore.ArchiveSpanWriter(), nil
 }
 
+func (f *Factory) CreateSamplingStore() (samplingstore.Store, error) {
+	return f.services.SamplingStore.SamplingStore(), nil
+}
+
 // Close closes the resources held by the factory
 func (f *Factory) Close() error {
 	var errs []error
diff --git a/plugin/storage/grpc/shared/grpc_client.go b/plugin/storage/grpc/shared/grpc_client.go
index ab2e73bac10..3b15f39a422 100644
--- a/plugin/storage/grpc/shared/grpc_client.go
+++ b/plugin/storage/grpc/shared/grpc_client.go
@@ -20,6 +20,7 @@ import (
 	_ "github.com/jaegertracing/jaeger/pkg/gogocodec" // force gogo codec registration
 	"github.com/jaegertracing/jaeger/proto-gen/storage_v1"
 	"github.com/jaegertracing/jaeger/storage/dependencystore"
+	"github.com/jaegertracing/jaeger/storage/samplingstore"
 	"github.com/jaegertracing/jaeger/storage/spanstore"
 )
 
@@ -53,6 +54,7 @@ func NewGRPCClient(tracedConn *grpc.ClientConn, untracedConn *grpc.ClientConn) *
 		capabilitiesClient:  storage_v1.NewPluginCapabilitiesClient(tracedConn),
 		depsReaderClient:    storage_v1.NewDependenciesReaderPluginClient(tracedConn),
 		streamWriterClient:  storage_v1.NewStreamingSpanWriterPluginClient(untracedConn),
+		samplingStoreClient: storage_v1.NewSamplingStorePluginClient(untracedConn),
 	}
 }
 
@@ -71,6 +73,10 @@ func (c *GRPCClient) SpanWriter() spanstore.Writer {
 	return c
 }
 
+func (c *GRPCClient) SamplingStore() samplingstore.Store {
+	return c
+}
+
 func (c *GRPCClient) StreamingSpanWriter() spanstore.Writer {
 	return newStreamingSpanWriter(c.streamWriterClient)
 }
@@ -270,7 +276,8 @@ func readTrace(stream storage_v1.SpanReaderPlugin_GetTraceClient) (*model.Trace,
 	return &trace, nil
 }
 
-func (c *GRPCClient) InsertThroughput(ctx context.Context, throughputs []*samplingStoreModel.Throughput) error {
+func (c *GRPCClient) InsertThroughput(throughputs []*samplingStoreModel.Throughput) error {
+	ctx := context.Background()
 	storageV1Throughput := []*storage_v1.Throughput{}
 	for _, throughput := range throughputs {
 		probsAsArray := []float64{}
@@ -300,7 +307,8 @@ func (c *GRPCClient) InsertThroughput(ctx context.Context, throughputs []*sampli
 	return nil
 }
 
-func (c *GRPCClient) InsertProbabilitiesAndQPS(ctx context.Context, hostname string, probabilities samplingStoreModel.ServiceOperationProbabilities, qps samplingStoreModel.ServiceOperationQPS) error {
+func (c *GRPCClient) InsertProbabilitiesAndQPS(hostname string, probabilities samplingStoreModel.ServiceOperationProbabilities, qps samplingStoreModel.ServiceOperationQPS) error {
+	ctx := context.Background()
 	stringFloatMapToV1StringFloatMap := func(in map[string]float64) *storage_v1.StringFloatMap {
 		return &storage_v1.StringFloatMap{
 			StringFloatMap: in,
@@ -331,7 +339,8 @@ func (c *GRPCClient) InsertProbabilitiesAndQPS(ctx context.Context, hostname str
 	return nil
 }
 
-func (c *GRPCClient) GetThroughput(ctx context.Context, start, end time.Time) ([]*samplingStoreModel.Throughput, error) {
+func (c *GRPCClient) GetThroughput(start, end time.Time) ([]*samplingStoreModel.Throughput, error) {
+	ctx := context.Background()
 	resp, err := c.samplingStoreClient.GetThroughput(ctx, &storage_v1.GetThroughputRequest{
 		StartTime: start,
 		EndTime:   end,
@@ -359,7 +368,8 @@ func (c *GRPCClient) GetThroughput(ctx context.Context, start, end time.Time) ([
 	return resThroughput, nil
 }
 
-func (c *GRPCClient) GetLatestProbabilities(ctx context.Context) (samplingStoreModel.ServiceOperationProbabilities, error) {
+func (c *GRPCClient) GetLatestProbabilities() (samplingStoreModel.ServiceOperationProbabilities, error) {
+	ctx := context.Background()
 	resp, err := c.samplingStoreClient.GetLatestProbabilities(ctx, &storage_v1.GetLatestProbabilitiesRequest{})
 	if err != nil {
 		return nil, fmt.Errorf("plugin error: %w", err)
diff --git a/plugin/storage/grpc/shared/grpc_client_test.go b/plugin/storage/grpc/shared/grpc_client_test.go
index a8bb88fcf34..a0e97bc2cad 100644
--- a/plugin/storage/grpc/shared/grpc_client_test.go
+++ b/plugin/storage/grpc/shared/grpc_client_test.go
@@ -112,6 +112,7 @@ func TestNewGRPCClient(t *testing.T) {
 	assert.Implements(t, (*storage_v1.PluginCapabilitiesClient)(nil), client.capabilitiesClient)
 	assert.Implements(t, (*storage_v1.DependenciesReaderPluginClient)(nil), client.depsReaderClient)
 	assert.Implements(t, (*storage_v1.StreamingSpanWriterPluginClient)(nil), client.streamWriterClient)
+	assert.Implements(t, (*storage_v1.SamplingStorePluginClient)(nil), client.samplingStoreClient)
 }
 
 func TestGRPCClientGetServices(t *testing.T) {
diff --git a/plugin/storage/grpc/shared/interface.go b/plugin/storage/grpc/shared/interface.go
index 9c5b9fd8c2e..60d4011743b 100644
--- a/plugin/storage/grpc/shared/interface.go
+++ b/plugin/storage/grpc/shared/interface.go
@@ -28,7 +28,7 @@ type StreamingSpanWriterPlugin interface {
 }
 
 type SamplingStorePlugin interface {
-	SamplingStoreRW() samplingstore.Store
+	SamplingStore() samplingstore.Store
 }
 
 // PluginCapabilities allow expose plugin its capabilities.
diff --git a/plugin/storage/integration/grpc_test.go b/plugin/storage/integration/grpc_test.go
index 77e273cf826..8e7e949d125 100644
--- a/plugin/storage/integration/grpc_test.go
+++ b/plugin/storage/integration/grpc_test.go
@@ -43,6 +43,8 @@ func (s *GRPCStorageIntegrationTestSuite) initialize(t *testing.T) {
 	require.NoError(t, err)
 	s.ArchiveSpanWriter, err = f.CreateArchiveSpanWriter()
 	require.NoError(t, err)
+	s.SamplingStore, err = f.CreateSamplingStore()
+	require.NoError(t, err)
 
 	// TODO DependencyWriter is not implemented in grpc store