Avoid failure when submitting request quickly

fix #6408

When submitting quickly, the creation may fail because the cache is not
updated. We can assume that is in progress, and the next reconcile will
handle it based on the actual situation.

pkg/resolution/resource/crd_resource.go

@@ -27,6 +27,7 @@ import (
 	rrclient "github.com/tektoncd/pipeline/pkg/client/resolution/clientset/versioned"
 	rrlisters "github.com/tektoncd/pipeline/pkg/client/resolution/listers/resolution/v1beta1"
 	resolutioncommon "github.com/tektoncd/pipeline/pkg/resolution/common"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"knative.dev/pkg/apis"
 )
@@ -54,7 +55,11 @@ var _ Requester = &CRDRequester{}
 func (r *CRDRequester) Submit(ctx context.Context, resolver ResolverName, req Request) (ResolvedResource, error) {
 	rr, _ := r.lister.ResolutionRequests(req.Namespace()).Get(req.Name())
 	if rr == nil {
-		if err := r.createResolutionRequest(ctx, resolver, req); err != nil {
+		if err := r.createResolutionRequest(ctx, resolver, req); err != nil &&
+			// When submitting quickly, the creation may fail because the cache is not updated.
+			// If the request already exists then we can assume that is in progress.
+			// The next reconcile will handle it based on the actual situation.
+			!apierrors.IsAlreadyExists(err) {
 			return nil, err
 		}
 		return nil, resolutioncommon.ErrRequestInProgress