Stateful engine pinned to a single zone

errorstateful-engine-pinned-to-single-zone

A matching engine, coordination service or event store living in exactly one availability zone, with no failover and no replication, is lost with that zone. Everything that depends on it stops with it.

Severity: error
Selects: every node of kind matching-engine, coordination-service or event-store
Components in scope: 26

What it checks

It looks at every node of kind matching-engine, coordination-service or event-store, and fires when:

— all of these hold:
— the node sits inside exactly 1 availability-zone group
— any of these hold:
— the node's `failover` is "none"
— the node's `replicated` is false
— the node's `replication` is "none"

Message

'{{node.id}}' is pinned to a single availability zone with no failover or replication.

{{node.id}} style paths are filled in from the node, the edge or the design the finding is about.

Applies to · 26 components

Coordination service coordination-service Event store event-store Matching engine matching-engine

Tripped by · 7

Reference designs whose broken twin names this rule in its header. The gate reads the same header, and fails when a rule no design trips.

coinbase-exchangereference digital-walletreference dropbox-syncreference etsy-searchreference figma-multiplayerreference object-storagereference unique-id-generatorreference

Source

1# yaml-language-server: $schema=../schema/rule.schema.json
2# A matching engine, coordination service or event store that lives in exactly one
3# availability zone with no failover or replication is lost with that zone, and everything
4# that depends on it stops. Tripped by: designs/object-storage.broken.yaml
5schemaVersion: "1"
6type: "rule"
7id: "stateful-engine-pinned-to-single-zone"
8severity: "error"
9select:
10  node:
11    kind: ["matching-engine", "coordination-service", "event-store"]
12when:
13  all:
14    - inGroup:
15        kind: "availability-zone"
16        count:
17          eq: 1
18    - any:
19        - prop: "failover"
20          equals: "none"
21        - prop: "replicated"
22          equals: false
23        - prop: "replication"
24          equals: "none"
25message: "'{{node.id}}' is pinned to a single availability zone with no failover or replication."

The same page as markdown, for an agent: /catalogue/rules/stateful-engine-pinned-to-single-zone.md