Generic queue

Vendor-neutral queue. Use when the real product is not in the catalogue; every rule for this kind still applies.

Provider: default
Kind: Queue
Category: Messaging
Official docs: not recorded
Generic?: Vendor-neutral: the kind itself

Properties · 0 set by this component

property	type	values	required	default
backoff	enum	none \| fixed \| exponential \| exponential-jitter	no	—
deadLetterQueue	boolean	—	no	false
delivery	enum	at-most-once \| at-least-once \| exactly-once	yes	—
instances	integer	—	no	—
managed	boolean	—	no	false
maxAttempts	integer	—	no	—
ordering	enum	none \| per-key \| global	no	none
persistence	boolean	—	no	true
replay	boolean	—	no	false
retentionDays	integer	—	no	—
role	enum	work \| dlq \| retry \| offline-mailbox \| frontier	no	work

Rules that apply · 3

Every rule whose selector covers this component's kind or its category. Whether a rule fires depends on the design: its properties, its edges and its groups.

Queue without dead-letter queueerror

queue-missing-dlq

A queue that receives asynchronous traffic and has no dead-letter queue either drops poison messages or retries them forever. Neither outcome leaves anything for a human to investigate.

— all of these hold:
— the node's `deadLetterQueue` is false
— the node has at least one asynchronous incoming edge

Retry queue without dead-letter queueerror

retry-queue-without-dlq

A retry queue is where poison messages end up. With no dead-letter queue they are retried forever or dropped in silence, and nobody ever looks at the failed payment.

— all of these hold:
— the node's `role` is "retry"
— the node's `deadLetterQueue` is false

Retry queue without backoffwarning

retry-without-backoff

Retrying a transient failure at full speed turns one slow dependency into a retry storm. A retry queue backs off, preferably exponentially and with jitter.

— all of these hold:
— the node's `role` is "retry"
— any of these hold:
— the node's `backoff` has no value
— the node's `backoff` is "none"

Use it in a design

nodes:
  - { id: "queue", component: "queue" }

Other Queue products · 23

Source

1# yaml-language-server: $schema=../../schema/component.schema.json
2# The vendor-neutral queue: the kind itself, with no product behind it. It sets no
3# defaults and adds no properties, so every required kind property stays required on the node.
4schemaVersion: "1"
5type: "component"
6id: "queue"
7kind: "queue"
8provider: "default"

The same page as markdown, for an agent: /catalogue/components/queue.md