add vtgate flag that explicitly allows vstream copy (#125)

go/flags/endtoend/vtgate.txt

@@ -239,6 +239,8 @@ Usage of vtgate:
 	Select tcp, tcp4, or tcp6 to control the socket type. (default tcp)
   --no_scatter
 	when set to true, the planner will fail instead of producing a plan that includes scatter queries
+  --no_vstream_copy
+	when set to true, vstream copy will not be allowed - temporary until we can properly support RDONLY for this
   --normalize_queries
 	Rewrite queries with bind vars. Turn this off if the app itself sends normalized queries with bind vars. (default true)
   --onclose_timeout duration

go/vt/vtexplain/vtexplain_vtgate.go

@@ -71,7 +71,7 @@ func (vte *VTExplain) initVtgateExecutor(vSchemaStr, ksShardMapStr string, opts
 
 	streamSize := 10
 	var schemaTracker vtgate.SchemaInfo // no schema tracker for these tests
-	vte.vtgateExecutor = vtgate.NewExecutor(context.Background(), vte.explainTopo, vtexplainCell, resolver, opts.Normalize, false, streamSize, cache.DefaultConfig, schemaTracker, false, opts.PlannerVersion)
+	vte.vtgateExecutor = vtgate.NewExecutor(context.Background(), vte.explainTopo, vtexplainCell, resolver, opts.Normalize, false, streamSize, cache.DefaultConfig, schemaTracker, false, opts.PlannerVersion, false)
 
 	return nil
 }

go/vt/vtgate/executor.go

@@ -107,6 +107,9 @@ type Executor struct {
 
 	// allowScatter will fail planning if set to false and a plan contains any scatter queries
 	allowScatter bool
+	// allowVstreamCopy will fail on vstream copy if false and no GTID provided for the stream.
+	// This is temporary until RDONLYs are properly supported for bootstrapping.
+	allowVstreamCopy bool
 }
 
 var executorOnce sync.Once
@@ -127,20 +130,22 @@ func NewExecutor(
 	schemaTracker SchemaInfo,
 	noScatter bool,
 	pv plancontext.PlannerVersion,
+	noVstreamCopy bool,
 ) *Executor {
 	e := &Executor{
-		serv:            serv,
-		cell:            cell,
-		resolver:        resolver,
-		scatterConn:     resolver.scatterConn,
-		txConn:          resolver.scatterConn.txConn,
-		plans:           cache.NewDefaultCacheImpl(cacheCfg),
-		normalize:       normalize,
-		warnShardedOnly: warnOnShardedOnly,
-		streamSize:      streamSize,
-		schemaTracker:   schemaTracker,
-		allowScatter:    !noScatter,
-		pv:              pv,
+		serv:             serv,
+		cell:             cell,
+		resolver:         resolver,
+		scatterConn:      resolver.scatterConn,
+		txConn:           resolver.scatterConn.txConn,
+		plans:            cache.NewDefaultCacheImpl(cacheCfg),
+		normalize:        normalize,
+		warnShardedOnly:  warnOnShardedOnly,
+		streamSize:       streamSize,
+		schemaTracker:    schemaTracker,
+		allowScatter:     !noScatter,
+		allowVstreamCopy: !noVstreamCopy,
+		pv:               pv,
 	}
 
 	vschemaacl.Init()
@@ -1318,7 +1323,7 @@ func (e *Executor) startVStream(ctx context.Context, rss []*srvtopo.ResolvedShar
 		return err
 	}
 
-	vsm := newVStreamManager(e.resolver.resolver, e.serv, e.cell)
+	vsm := newVStreamManager(e.resolver.resolver, e.serv, e.cell, e.allowVstreamCopy)
 	vs := &vstream{
 		vgtid:              vgtid,
 		tabletType:         topodatapb.TabletType_PRIMARY,

go/vt/vtgate/executor_framework_test.go

@@ -469,7 +469,7 @@ func createExecutorEnv() (executor *Executor, sbc1, sbc2, sbclookup *sandboxconn
 	bad.VSchema = badVSchema
 
 	getSandbox(KsTestUnsharded).VSchema = unshardedVSchema
-	executor = NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3)
+	executor = NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3, false)
 
 	key.AnyShardPicker = DestinationAnyShardPickerFirstShard{}
 	// create a new session each time so that ShardSessions don't get re-used across tests
@@ -493,7 +493,7 @@ func createCustomExecutor(vschema string) (executor *Executor, sbc1, sbc2, sbclo
 	sbclookup = hc.AddTestTablet(cell, "0", 1, KsTestUnsharded, "0", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	getSandbox(KsTestUnsharded).VSchema = unshardedVSchema
 
-	executor = NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3)
+	executor = NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3, false)
 	// create a new session each time so that ShardSessions don't get re-used across tests
 	primarySession = &vtgatepb.Session{
 		TargetString: "@primary",
@@ -522,7 +522,7 @@ func createCustomExecutorSetValues(vschema string, values []*sqltypes.Result) (e
 	sbclookup = hc.AddTestTablet(cell, "0", 1, KsTestUnsharded, "0", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	getSandbox(KsTestUnsharded).VSchema = unshardedVSchema
 
-	executor = NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3)
+	executor = NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3, false)
 	// create a new session each time so that ShardSessions don't get re-used across tests
 	primarySession = &vtgatepb.Session{
 		TargetString: "@primary",

go/vt/vtgate/executor_select_test.go

@@ -1483,7 +1483,7 @@ func TestStreamSelectIN(t *testing.T) {
 }
 
 func createExecutor(serv *sandboxTopo, cell string, resolver *Resolver) *Executor {
-	return NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3)
+	return NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3, false)
 }
 
 func TestSelectScatter(t *testing.T) {
@@ -2981,7 +2981,7 @@ func TestStreamOrderByLimitWithMultipleResults(t *testing.T) {
 		count++
 	}
 
-	executor := NewExecutor(context.Background(), serv, cell, resolver, true, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3)
+	executor := NewExecutor(context.Background(), serv, cell, resolver, true, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3, false)
 	before := runtime.NumGoroutine()
 
 	query := "select id, col from user order by id limit 2"

go/vt/vtgate/executor_stream_test.go

@@ -61,7 +61,7 @@ func TestStreamSQLSharded(t *testing.T) {
 	for _, shard := range shards {
 		_ = hc.AddTestTablet(cell, shard, 1, "TestExecutor", shard, topodatapb.TabletType_PRIMARY, true, 1, nil)
 	}
-	executor := NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3)
+	executor := NewExecutor(context.Background(), serv, cell, resolver, false, false, testBufferSize, cache.DefaultConfig, nil, false, querypb.ExecuteOptions_V3, false)
 
 	sql := "stream * from sharded_user_msgs"
 	result, err := executorStreamMessages(executor, sql)

go/vt/vtgate/vstream_manager.go

@@ -27,6 +27,7 @@ import (
 	"vitess.io/vitess/go/stats"
 	"vitess.io/vitess/go/vt/discovery"
 	querypb "vitess.io/vitess/go/vt/proto/query"
+	"vitess.io/vitess/go/vt/proto/vtrpc"
 	"vitess.io/vitess/go/vt/servenv"
 	"vitess.io/vitess/go/vt/topo"
 
@@ -47,6 +48,9 @@ type vstreamManager struct {
 	resolver *srvtopo.Resolver
 	toposerv srvtopo.Server
 	cell     string
+	// allowVstreamCopy will fail on vstream copy if false and no GTID provided for the stream.
+	// This is temporary until RDONLYs are properly supported for bootstrapping.
+	allowVstreamCopy bool
 
 	vstreamsCreated *stats.CountersWithMultiLabels
 	vstreamsLag     *stats.GaugesWithMultiLabels
@@ -119,12 +123,13 @@ type journalEvent struct {
 	done         chan struct{}
 }
 
-func newVStreamManager(resolver *srvtopo.Resolver, serv srvtopo.Server, cell string) *vstreamManager {
+func newVStreamManager(resolver *srvtopo.Resolver, serv srvtopo.Server, cell string, allowVstreamCopy bool) *vstreamManager {
 	exporter := servenv.NewExporter(cell, "VStreamManager")
 	return &vstreamManager{
-		resolver: resolver,
-		toposerv: serv,
-		cell:     cell,
+		resolver:         resolver,
+		toposerv:         serv,
+		cell:             cell,
+		allowVstreamCopy: allowVstreamCopy,
 		vstreamsCreated: exporter.NewCountersWithMultiLabels(
 			"VStreamsCreated",
 			"Number of vstreams created",
@@ -540,6 +545,12 @@ func (vs *vstream) streamFromTablet(ctx context.Context, sgtid *binlogdatapb.Sha
 		log.Infof("Starting to vstream from %s", tablet.Alias.String())
 		// Safe to access sgtid.Gtid here (because it can't change until streaming begins).
 		var vstreamCreatedOnce sync.Once
+
+		if !vs.vsm.allowVstreamCopy && (sgtid.Gtid == "" || len(sgtid.TablePKs) > 0) {
+			// We are attempting a vstream copy, but are not allowed (temporary until we can properly support RDONLYs for bootstrapping)
+			return vterrors.NewErrorf(vtrpc.Code_UNIMPLEMENTED, vterrors.NotSupportedYet, "vstream copy is not currently supported")
+		}
+
 		err = tabletConn.VStream(ctx, target, sgtid.Gtid, sgtid.TablePKs, vs.filter, func(events []*binlogdatapb.VEvent) error {
 			// We received a valid event. Reset error count.
 			errCount = 0

go/vt/vtgate/vstream_manager_test.go

@@ -90,7 +90,7 @@ func TestVStreamSkew(t *testing.T) {
 			_ = createSandbox(ks)
 			hc := discovery.NewFakeHealthCheck(nil)
 			st := getSandboxTopo(ctx, cell, ks, []string{"-20", "20-40"})
-			vsm := newTestVStreamManager(hc, st, cell)
+			vsm := newTestVStreamManager(hc, st, cell, true)
 			vgtid := &binlogdatapb.VGtid{ShardGtids: []*binlogdatapb.ShardGtid{}}
 			want := int64(0)
 			var sbc0, sbc1 *sandboxconn.SandboxConn
@@ -136,7 +136,7 @@ func TestVStreamEvents(t *testing.T) {
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20"})
 
-	vsm := newTestVStreamManager(hc, st, cell)
+	vsm := newTestVStreamManager(hc, st, cell, true)
 	sbc0 := hc.AddTestTablet(cell, "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
 
@@ -213,7 +213,7 @@ func TestVStreamChunks(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20", "20-40"})
-	vsm := newTestVStreamManager(hc, st, cell)
+	vsm := newTestVStreamManager(hc, st, cell, true)
 	sbc0 := hc.AddTestTablet("aa", "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
 	sbc1 := hc.AddTestTablet("aa", "1.1.1.1", 1002, ks, "20-40", topodatapb.TabletType_PRIMARY, true, 1, nil)
@@ -298,7 +298,7 @@ func TestVStreamManagerGetCells(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20", "20-40"})
-	vsm := newTestVStreamManager(hc, st, "aa")
+	vsm := newTestVStreamManager(hc, st, "aa", true)
 	ts, _ := st.GetTopoServer()
 
 	for _, tcase := range tcases {
@@ -353,7 +353,7 @@ func TestVStreamMulti(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20", "20-40"})
-	vsm := newTestVStreamManager(hc, st, "aa")
+	vsm := newTestVStreamManager(hc, st, "aa", true)
 	sbc0 := hc.AddTestTablet(cell, "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
 	sbc1 := hc.AddTestTablet(cell, "1.1.1.1", 1002, ks, "20-40", topodatapb.TabletType_PRIMARY, true, 1, nil)
@@ -415,7 +415,7 @@ func TestVStreamsCreatedAndLagMetrics(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20", "20-40"})
-	vsm := newTestVStreamManager(hc, st, cell)
+	vsm := newTestVStreamManager(hc, st, cell, true)
 	vsm.vstreamsCreated.ResetAll()
 	vsm.vstreamsLag.ResetAll()
 	sbc0 := hc.AddTestTablet(cell, "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
@@ -470,7 +470,7 @@ func TestVStreamRetry(t *testing.T) {
 	hc := discovery.NewFakeHealthCheck(nil)
 
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20"})
-	vsm := newTestVStreamManager(hc, st, "aa")
+	vsm := newTestVStreamManager(hc, st, "aa", true)
 	sbc0 := hc.AddTestTablet(cell, "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
 	commit := []*binlogdatapb.VEvent{
@@ -511,7 +511,7 @@ func TestVStreamShouldNotSendSourceHeartbeats(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20"})
-	vsm := newTestVStreamManager(hc, st, cell)
+	vsm := newTestVStreamManager(hc, st, cell, true)
 	sbc0 := hc.AddTestTablet(cell, "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
 
@@ -561,7 +561,7 @@ func TestVStreamJournalOneToMany(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20", "-10", "10-20"})
-	vsm := newTestVStreamManager(hc, st, "aa")
+	vsm := newTestVStreamManager(hc, st, "aa", true)
 	sbc0 := hc.AddTestTablet(cell, "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
 	sbc1 := hc.AddTestTablet(cell, "1.1.1.1", 1002, ks, "-10", topodatapb.TabletType_PRIMARY, true, 1, nil)
@@ -674,7 +674,7 @@ func TestVStreamJournalManyToOne(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20", "-10", "10-20"})
-	vsm := newTestVStreamManager(hc, st, cell)
+	vsm := newTestVStreamManager(hc, st, cell, true)
 	sbc0 := hc.AddTestTablet(cell, "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
 	sbc1 := hc.AddTestTablet(cell, "1.1.1.1", 1002, ks, "-10", topodatapb.TabletType_PRIMARY, true, 1, nil)
@@ -791,7 +791,7 @@ func TestVStreamJournalNoMatch(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20"})
-	vsm := newTestVStreamManager(hc, st, "aa")
+	vsm := newTestVStreamManager(hc, st, "aa", true)
 	sbc0 := hc.AddTestTablet("aa", "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
 
@@ -920,7 +920,7 @@ func TestVStreamJournalPartialMatch(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20", "-10", "10-20"})
-	vsm := newTestVStreamManager(hc, st, "aa")
+	vsm := newTestVStreamManager(hc, st, "aa", true)
 	sbc1 := hc.AddTestTablet("aa", "1.1.1.1", 1002, ks, "-10", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-10", sbc1.Tablet())
 	sbc2 := hc.AddTestTablet("aa", "1.1.1.1", 1003, ks, "10-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
@@ -1000,7 +1000,7 @@ func TestResolveVStreamParams(t *testing.T) {
 	name := "TestVStream"
 	_ = createSandbox(name)
 	hc := discovery.NewFakeHealthCheck(nil)
-	vsm := newTestVStreamManager(hc, new(sandboxTopo), "aa")
+	vsm := newTestVStreamManager(hc, new(sandboxTopo), "aa", true)
 	testcases := []struct {
 		input  *binlogdatapb.VGtid
 		output *binlogdatapb.VGtid
@@ -1146,7 +1146,7 @@ func TestVStreamIdleHeartbeat(t *testing.T) {
 	_ = createSandbox(ks)
 	hc := discovery.NewFakeHealthCheck(nil)
 	st := getSandboxTopo(ctx, cell, ks, []string{"-20"})
-	vsm := newTestVStreamManager(hc, st, cell)
+	vsm := newTestVStreamManager(hc, st, cell, true)
 	sbc0 := hc.AddTestTablet("aa", "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
 	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
 	vgtid := &binlogdatapb.VGtid{
@@ -1195,10 +1195,60 @@ func TestVStreamIdleHeartbeat(t *testing.T) {
 	}
 }
 
-func newTestVStreamManager(hc discovery.HealthCheck, serv srvtopo.Server, cell string) *vstreamManager {
+func TestVstreamCopy(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	cell := "aa"
+	ks := "TestVStreamCopy"
+	_ = createSandbox(ks)
+	hc := discovery.NewFakeHealthCheck(nil)
+
+	st := getSandboxTopo(ctx, cell, ks, []string{"-20"})
+	sbc0 := hc.AddTestTablet(cell, "1.1.1.1", 1001, ks, "-20", topodatapb.TabletType_PRIMARY, true, 1, nil)
+	addTabletToSandboxTopo(t, st, ks, "-20", sbc0.Tablet())
+	commit := []*binlogdatapb.VEvent{
+		{Type: binlogdatapb.VEventType_COMMIT},
+	}
+	sbc0.AddVStreamEvents(commit, nil)
+	sbc0.AddVStreamEvents(nil, vterrors.Errorf(vtrpcpb.Code_FAILED_PRECONDITION, "aa"))
+	sbc0.AddVStreamEvents(commit, nil)
+	sbc0.AddVStreamEvents(nil, vterrors.Errorf(vtrpcpb.Code_FAILED_PRECONDITION, "bb"))
+	sbc0.AddVStreamEvents(nil, vterrors.Errorf(vtrpcpb.Code_FAILED_PRECONDITION, "cc"))
+	sbc0.AddVStreamEvents(nil, vterrors.Errorf(vtrpcpb.Code_FAILED_PRECONDITION, "final error"))
+	var count sync2.AtomicInt32
+	count.Set(0)
+	// empty gtid id means no start position = bootstrapping/vstream copy
+	vgtid := &binlogdatapb.VGtid{
+		ShardGtids: []*binlogdatapb.ShardGtid{{
+			Keyspace: ks,
+			Shard:    "-20",
+			Gtid:     "",
+		}},
+	}
+
+	// allowVstreamCopy = false
+	vsm := newTestVStreamManager(hc, st, "aa", false)
+	err := vsm.VStream(ctx, topodatapb.TabletType_PRIMARY, vgtid, nil, &vtgatepb.VStreamFlags{}, func(events []*binlogdatapb.VEvent) error {
+		count.Add(1)
+		return nil
+	})
+	require.Error(t, err)
+	require.Equal(t, err.Error(), "vstream copy is not currently supported")
+
+	// allowVstreamCopy = true
+	vsm2 := newTestVStreamManager(hc, st, "aa", true)
+	err = vsm2.VStream(ctx, topodatapb.TabletType_PRIMARY, vgtid, nil, &vtgatepb.VStreamFlags{}, func(events []*binlogdatapb.VEvent) error {
+		count.Add(1)
+		return nil
+	})
+	require.Equal(t, err.Error(), "final error")
+}
+
+func newTestVStreamManager(hc discovery.HealthCheck, serv srvtopo.Server, cell string, allowVstreamCopy bool) *vstreamManager {
 	gw := NewTabletGateway(context.Background(), hc, serv, cell)
 	srvResolver := srvtopo.NewResolver(serv, gw, cell)
-	return newVStreamManager(srvResolver, serv, cell)
+	return newVStreamManager(srvResolver, serv, cell, allowVstreamCopy)
 }
 
 func startVStream(ctx context.Context, t *testing.T, vsm *vstreamManager, vgtid *binlogdatapb.VGtid, flags *vtgatepb.VStreamFlags) <-chan *binlogdatapb.VStreamResponse {

go/vt/vtgate/vtgate.go

@@ -71,6 +71,7 @@ var (
 	defaultDDLStrategy   = flag.String("ddl_strategy", string(schema.DDLStrategyDirect), "Set default strategy for DDL statements. Override with @@ddl_strategy session variable")
 	dbDDLPlugin          = flag.String("dbddl_plugin", "fail", "controls how to handle CREATE/DROP DATABASE. use it if you are using your own database provisioning service")
 	noScatter            = flag.Bool("no_scatter", false, "when set to true, the planner will fail instead of producing a plan that includes scatter queries")
+	noVstreamCopy        = flag.Bool("no_vstream_copy", false, "when set to true, vstream copy will not be allowed - temporary until we can properly support RDONLY for this")
 
 	// TODO(deepthi): change these two vars to unexported and move to healthcheck.go when LegacyHealthcheck is removed
 
@@ -210,7 +211,7 @@ func Init(
 	sc := NewScatterConn("VttabletCall", tc, gw)
 	srvResolver := srvtopo.NewResolver(serv, gw, cell)
 	resolver := NewResolver(srvResolver, serv, cell, sc)
-	vsm := newVStreamManager(srvResolver, serv, cell)
+	vsm := newVStreamManager(srvResolver, serv, cell, !*noVstreamCopy)
 
 	var si SchemaInfo // default nil
 	var st *vtschema.Tracker
@@ -238,6 +239,7 @@ func Init(
 		si,
 		*noScatter,
 		pv,
+		*noVstreamCopy,
 	)
 
 	// connect the schema tracker with the vschema manager