Report an error if we fail to load an account on a stream assignment.

server/jetstream_api.go

@@ -600,6 +600,7 @@ var (
 	jsClusterNoPeersErr    = &ApiError{Code: 400, Description: "no suitable peers for placement"}
 	jsServerNotMemberErr   = &ApiError{Code: 400, Description: "server is not a member of the cluster"}
 	jsNoMessageFoundErr    = &ApiError{Code: 404, Description: "no message found"}
+	jsNoAccountErr         = &ApiError{Code: 503, Description: "account not found"}
 )
 
 // For easier handling of exports and imports.

server/jetstream_cluster.go

@@ -1807,18 +1807,28 @@ func (js *jetStream) streamAssignment(account, stream string) (sa *streamAssignm
 func (js *jetStream) processStreamAssignment(sa *streamAssignment) bool {
 	js.mu.RLock()
 	s, cc := js.srv, js.cluster
+	accName, stream := sa.Client.serviceAccount(), sa.Config.Name
 	js.mu.RUnlock()
+
 	if s == nil || cc == nil {
 		// TODO(dlc) - debug at least
 		return false
 	}
 
-	acc, err := s.LookupAccount(sa.Client.serviceAccount())
+	acc, err := s.LookupAccount(accName)
 	if err != nil {
+		// If we can not lookup our account send this result back to the metacontroller leader.
+		result := &streamAssignmentResult{
+			Account:  accName,
+			Stream:   stream,
+			Response: &JSApiStreamCreateResponse{ApiResponse: ApiResponse{Type: JSApiStreamCreateResponseType}},
+		}
+		result.Response.Error = jsNoAccountErr
+		s.sendInternalMsgLocked(streamAssignmentSubj, _EMPTY_, nil, result)
+
 		// TODO(dlc) - log error
 		return false
 	}
-	stream := sa.Config.Name
 
 	js.mu.Lock()
 	if cc.meta == nil {

server/jetstream_cluster_test.go

@@ -5284,6 +5284,26 @@ func TestJetStreamClusterServerLimits(t *testing.T) {
 	}
 }
 
+func TestJetStreamClusterAccountLoadFailure(t *testing.T) {
+	c := createJetStreamClusterWithTemplate(t, jsClusterLimitsTempl, "R3L", 3)
+	defer c.shutdown()
+
+	// Client based API
+	nc, js := jsClientConnect(t, c.leader())
+	defer nc.Close()
+
+	// Remove the "ONE" account from non-leader
+	s := c.randomNonLeader()
+	s.mu.Lock()
+	s.accounts.Delete("ONE")
+	s.mu.Unlock()
+
+	_, err := js.AddStream(&nats.StreamConfig{Name: "F", Replicas: 3})
+	if err == nil || !strings.Contains(err.Error(), "account not found") {
+		t.Fatalf("Expected an 'account not found' error but got %v", err)
+	}
+}
+
 // Support functions
 
 // Used to setup superclusters for tests.