Coordination service

opscoordination-service

Strongly consistent service for metadata, locks, discovery and placement.

Category: Operations
Properties: 5
Components: 18
Rules: 2

Properties · 5 defined by this kind

A node of this kind resolves each property from its own props, then the component's defaults, then the default below.

property	type	values	required	default
consensus	enum	none \| raft \| paxos \| zab	no	none
managed	boolean	—	no	false
nodes	integer	—	no	—
replicated	boolean	—	no	false
role	enum	metadata \| lock \| discovery \| placement \| sharding \| leader-election \| config	yes	—

Rules for this kind · 2

Shared dependency without redundancyerror

shared-dependency-without-redundancy

The design requires redundant discovery, but this DNS or coordination service, which everything depends on, runs on a single provider or a single replica. Its failure is the whole system's failure.

— all of these hold:
— the design requirement `availability.discoveryRedundant` is true
— any of these hold:
— the node's `redundantProviders` is false
— the node's `replicated` is false

Stateful engine pinned to a single zoneerror

stateful-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.

— 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"

Components · 18

vendor-neutral

Generic coordination servicecoordination-servicegenericthe kind itself

alibabacloud

Microservices Enginealibaba-mse3 defaults

aws

AWS Cloud Mapaws-cloud-map2 defaults

azure

Azure Arcazure-arc2 defaults Azure Device Registryazure-device-registry2 defaults

cloudflare

Durable Objectscloudflare-durable-objects3 defaults

default

Apache Helixapache-helix3 defaults Consulconsul3 defaults etcdetcd3 defaults Eurekaeureka3 defaults Nacosnacos2 defaults Oxiaoxia3 defaults Apache ZooKeeperzookeeper3 defaults

gcp

Service Directorygoogle-service-directory3 defaults

k8s

Endpointsk8s-endpoints2 defaults

openstack

OpenStack Blazaropenstack-blazar2 defaults OpenStack Cyborgopenstack-cyborg2 defaults OpenStack Placementopenstack-placement2 defaults

Source

1# yaml-language-server: $schema=../schema/kind.schema.json
2# Small strongly consistent service for cluster metadata, locks, discovery, placement and leader election (ZooKeeper, etcd, Consul, Helix).
3# Absorbs control-plane-coordinator, sharding-coordinator and service-registry via role.
4schemaVersion: "1"
5type: "kind"
6id: "coordination-service"
7category: "ops"
8properties:
9  role:
10    type: "enum"
11    values: ["metadata", "lock", "discovery", "placement", "sharding", "leader-election", "config"]
12    required: true
13  consensus:
14    type: "enum"
15    values: ["none", "raft", "paxos", "zab"]
16    default: "none"
17  replicated:
18    type: "boolean"
19    default: false
20  nodes:
21    type: "integer"
22  managed:
23    type: "boolean"
24    default: false

The same page as markdown, for an agent: /catalogue/kinds/coordination-service.md