Designer guide Dashed failure path

Error connections

An Error stream is the dedicated consumer of failures emitted by transformations whose definition has `hasError` enabled.

When to use

Use this page while editing or reviewing the graph in the designer.

Error links are drawn as dashed arrows and carry the error-side message type.
A valid Error stream has exactly one source, and that source must support errors and must not already have an Error consumer.
When a stream supports errors, already has a regular consumer, and has no Error consumer, dragging from it to empty canvas creates and links an Error stream immediately.
Dragging a supported stream onto an unconnected Error node creates its dedicated error route.
An Error stream can itself be used as a regular source for a compatible downstream consumer.

Open the designer and select Graph.