temporalio/temporal · error

failed to load Nexus operation cancelation data: %w

Error message

failed to load Nexus operation cancelation data: %w

What it means

Error "failed to load Nexus operation cancelation data: %w" thrown in temporalio/temporal.

Source

Thrown at service/history/api/describeworkflow/api.go:778

		State:                   state,
		Attempt:                 op.Attempt,
		LastAttemptCompleteTime: op.LastAttemptCompleteTime,
		LastAttemptFailure:      op.LastAttemptFailure,
		NextAttemptScheduleTime: op.NextAttemptScheduleTime,
		CancellationInfo:        cancellationInfo,
		BlockedReason:           blockedReason,
	}, nil
}

func buildNexusOperationCancellationInfo(
	namespaceID namespace.ID,
	node *hsm.Node,
	op nexusoperations.Operation,
	outboundQueueCBPool *circuitbreakerpool.OutboundQueueCircuitBreakerPool,
) (*workflowpb.NexusOperationCancellationInfo, error) {
	cancelation, err := op.Cancelation(node)
	if err != nil {
		return nil, fmt.Errorf("failed to load Nexus operation cancelation data: %w", err)
	}
	if cancelation == nil {
		return nil, nil
	}

	state := cancelation.State()
	blockedReason := ""
	if state == enumspb.NEXUS_OPERATION_CANCELLATION_STATE_SCHEDULED {
		cb := outboundQueueCBPool.Get(tasks.TaskGroupNamespaceIDAndDestination{
			TaskGroup:   nexusoperations.TaskTypeCancelation,
			NamespaceID: namespaceID.String(),
			Destination: op.Endpoint,
		})
		if cb.State() != gobreaker.StateClosed {
			state = enumspb.NEXUS_OPERATION_CANCELLATION_STATE_BLOCKED
			blockedReason = "The circuit breaker is open."
		}
	}

View on GitHub (pinned to bde624efd1)

When it happens

Trigger: Thrown at service/history/api/describeworkflow/api.go:778 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of temporalio/temporal@bde624efd1 (2026-09-01). Data as JSON: /api/errors/fe64fe77efad9fec. Report an issue: GitHub.