VReplication Workflow: set state correctly when restarting workflow s…

…treams in the copy phase (#16217)

Signed-off-by: Rohit Nayak <rohit@planetscale.com>

go/vt/vttablet/tabletmanager/rpc_vreplication.go

@@ -59,6 +59,8 @@ const (
 	// Update field values for multiple workflows. The final format specifier is
 	// used to optionally add any additional predicates to the query.
 	sqlUpdateVReplicationWorkflows = "update /*vt+ ALLOW_UNSAFE_VREPLICATION_WRITE */ %s.vreplication set%s where db_name = '%s'%s"
+	// Check if workflow is still copying.
+	sqlGetVReplicationCopyStatus = "select distinct vrepl_id from %s.copy_state where vrepl_id = %d"
 )
 
 var (
@@ -379,6 +381,18 @@ func (tm *TabletManager) ReadVReplicationWorkflow(ctx context.Context, req *tabl
 	return resp, nil
 }
 
+func isStreamCopying(tm *TabletManager, id int64) (bool, error) {
+	query := fmt.Sprintf(sqlGetVReplicationCopyStatus, sidecar.GetIdentifier(), id)
+	res, err := tm.VREngine.Exec(query)
+	if err != nil {
+		return false, err
+	}
+	if res != nil && len(res.Rows) > 0 {
+		return true, nil
+	}
+	return false, nil
+}
+
 // UpdateVReplicationWorkflow updates the sidecar databases's vreplication
 // record(s) for this tablet's vreplication workflow stream(s). If there
 // are no streams for the given workflow on the tablet then a nil result
@@ -457,6 +471,17 @@ func (tm *TabletManager) UpdateVReplicationWorkflow(ctx context.Context, req *ta
 		if !textutil.ValueIsSimulatedNull(req.State) {
 			state = binlogdatapb.VReplicationWorkflowState_name[int32(req.State)]
 		}
+		if state == binlogdatapb.VReplicationWorkflowState_Running.String() {
+			// `Workflow Start` sets the new state to Running. However, if stream is still copying tables, we should set
+			// the state as Copying.
+			isCopying, err := isStreamCopying(tm, id)
+			if err != nil {
+				return nil, err
+			}
+			if isCopying {
+				state = binlogdatapb.VReplicationWorkflowState_Copying.String()
+			}
+		}
 		bindVars = map[string]*querypb.BindVariable{
 			"st": sqltypes.StringBindVariable(state),
 			"sc": sqltypes.StringBindVariable(string(source)),

go/vt/vttablet/tabletmanager/rpc_vreplication_test.go

@@ -390,7 +390,8 @@ func TestMoveTables(t *testing.T) {
 
 	for _, ftc := range targetShards {
 		addInvariants(ftc.vrdbClient, vreplID, sourceTabletUID, position, wf, tenv.cells[0])
-
+		getCopyStateQuery := fmt.Sprintf(sqlGetVReplicationCopyStatus, sidecar.GetIdentifier(), vreplID)
+		ftc.vrdbClient.AddInvariant(getCopyStateQuery, &sqltypes.Result{})
 		tenv.tmc.setVReplicationExecResults(ftc.tablet, getCopyState, &sqltypes.Result{})
 		ftc.vrdbClient.ExpectRequest(fmt.Sprintf(readAllWorkflows, tenv.dbName, ""), &sqltypes.Result{}, nil)
 		insert := fmt.Sprintf(`%s values ('%s', 'keyspace:\"%s\" shard:\"%s\" filter:{rules:{match:\"t1\" filter:\"select * from t1 where in_keyrange(id, \'%s.hash\', \'%s\')\"}}', '', 0, 0, '%s', 'primary,replica,rdonly', now(), 0, 'Stopped', '%s', %d, 0, 0, '{}')`,
@@ -574,6 +575,7 @@ func TestUpdateVReplicationWorkflow(t *testing.T) {
 		),
 		fmt.Sprintf("%d|%s|%s|%s|Running|", vreplID, blsStr, cells[0], tabletTypes[0]),
 	)
+
 	idQuery, err := sqlparser.ParseAndBind("select id from _vt.vreplication where id = %a",
 		sqltypes.Int64BindVariable(int64(vreplID)))
 	require.NoError(t, err)
@@ -585,10 +587,19 @@ func TestUpdateVReplicationWorkflow(t *testing.T) {
 		fmt.Sprintf("%d", vreplID),
 	)
 
+	getCopyStateQuery := fmt.Sprintf(sqlGetVReplicationCopyStatus, sidecar.GetIdentifier(), int64(vreplID))
+	copyStatusFields := sqltypes.MakeTestFields(
+		"id",
+		"int64",
+	)
+	notCopying := sqltypes.MakeTestResult(copyStatusFields)
+	copying := sqltypes.MakeTestResult(copyStatusFields, "1")
+
 	tests := []struct {
-		name    string
-		request *tabletmanagerdatapb.UpdateVReplicationWorkflowRequest
-		query   string
+		name      string
+		request   *tabletmanagerdatapb.UpdateVReplicationWorkflowRequest
+		query     string
+		isCopying bool
 	}{
 		{
 			name: "update cells",
@@ -668,6 +679,19 @@ func TestUpdateVReplicationWorkflow(t *testing.T) {
 			query: fmt.Sprintf(`update _vt.vreplication set state = '%s', source = 'keyspace:\"%s\" shard:\"%s\" filter:{rules:{match:\"corder\" filter:\"select * from corder\"} rules:{match:\"customer\" filter:\"select * from customer\"}}', cell = '%s', tablet_types = '%s' where id in (%d)`,
 				binlogdatapb.VReplicationWorkflowState_Stopped.String(), keyspace, shard, cells[0], tabletTypes[0], vreplID),
 		},
+		{
+			name: "update to running while copying",
+			request: &tabletmanagerdatapb.UpdateVReplicationWorkflowRequest{
+				Workflow:    workflow,
+				State:       binlogdatapb.VReplicationWorkflowState_Running,
+				Cells:       textutil.SimulatedNullStringSlice,
+				TabletTypes: []topodatapb.TabletType{topodatapb.TabletType(textutil.SimulatedNullInt)},
+				OnDdl:       binlogdatapb.OnDDLAction(textutil.SimulatedNullInt),
+			},
+			isCopying: true,
+			query: fmt.Sprintf(`update _vt.vreplication set state = 'Copying', source = 'keyspace:\"%s\" shard:\"%s\" filter:{rules:{match:\"corder\" filter:\"select * from corder\"} rules:{match:\"customer\" filter:\"select * from customer\"}}', cell = '%s', tablet_types = '%s' where id in (%d)`,
+				keyspace, shard, cells[0], tabletTypes[0], vreplID),
+		},
 	}
 
 	for _, tt := range tests {
@@ -686,12 +710,21 @@ func TestUpdateVReplicationWorkflow(t *testing.T) {
 			// These are the same for each RPC call.
 			tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(fmt.Sprintf("use %s", sidecar.GetIdentifier()), &sqltypes.Result{}, nil)
 			tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(selectQuery, selectRes, nil)
-			tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(fmt.Sprintf("use %s", sidecar.GetIdentifier()), &sqltypes.Result{}, nil)
-			tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(idQuery, idRes, nil)
+			if tt.request.State == binlogdatapb.VReplicationWorkflowState_Running ||
+				tt.request.State == binlogdatapb.VReplicationWorkflowState(textutil.SimulatedNullInt) {
+				tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(fmt.Sprintf("use %s", sidecar.GetIdentifier()), &sqltypes.Result{}, nil)
+				if tt.isCopying {
+					tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(getCopyStateQuery, copying, nil)
+				} else {
+					tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(getCopyStateQuery, notCopying, nil)
 
+				}
+			}
 			// This is our expected query, which will also short circuit
 			// the test with an error as at this point we've tested what
 			// we wanted to test.
+			tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(fmt.Sprintf("use %s", sidecar.GetIdentifier()), &sqltypes.Result{}, nil)
+			tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(idQuery, idRes, nil)
 			tenv.tmc.tablets[tabletUID].vrdbClient.ExpectRequest(tt.query, &sqltypes.Result{RowsAffected: 1}, errShortCircuit)
 			_, err = tenv.tmc.tablets[tabletUID].tm.UpdateVReplicationWorkflow(ctx, tt.request)
 			tenv.tmc.tablets[tabletUID].vrdbClient.Wait()