---
id: "cloudflare-durable-objects"
type: "component"
kind: "coordination-service"
provider: "cloudflare"
category: "ops"
docs: "https://developers.cloudflare.com/durable-objects/platform/limits/"
url: "https://localhost:3000/catalogue/components/cloudflare-durable-objects"
---

# Durable Objects

Named single-threaded objects that serialise access to their own SQLite storage.

| | |
|---|---|
| Provider | [cloudflare](https://localhost:3000/catalogue?provider=cloudflare) |
| Kind | [Coordination service](https://localhost:3000/catalogue/kinds/coordination-service) |
| Category | Operations |
| Official docs | [https://developers.cloudflare.com/durable-objects/platform/limits/](https://developers.cloudflare.com/durable-objects/platform/limits/) |

## Properties

| property | type | values | required | kind default | this component |
|---|---|---|---|---|---|
| `consensus` | enum | `none`, `raft`, `paxos`, `zab` | no | "none" | **"none"** |
| `managed` | boolean | — | no | false | **true** |
| `maxStorageGb` | integer | — | no | 10 | inherited |
| `nodes` | integer | — | no | — | inherited |
| `replicated` | boolean | — | no | false | inherited |
| `requestsPerSecondSoftLimit` | integer | — | no | 1000 | inherited |
| `role` | enum | `metadata`, `lock`, `discovery`, `placement`, `sharding`, `leader-election`, `config` | yes | — | **"lock"** |
| `singleThreaded` | boolean | — | no | true | inherited |
| `storageBackend` | enum | `sqlite`, `key-value` | no | "sqlite" | inherited |

Bold values are the ones this component pins.

## Rules that apply · 2

### Shared dependency without redundancy `shared-dependency-without-redundancy` (error)

- Page: https://localhost:3000/catalogue/rules/shared-dependency-without-redundancy.md
- Why: 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.
- Applies to: every node of kind dns or coordination-service
- Message: Shared dependency '{{node.id}}' is not redundant, but the design requires redundant discovery.

It fires when:

- 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 zone `stateful-engine-pinned-to-single-zone` (error)

- Page: https://localhost:3000/catalogue/rules/stateful-engine-pinned-to-single-zone.md
- Why: 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.
- Applies to: every node of kind matching-engine, coordination-service or event-store
- Message: '{{node.id}}' is pinned to a single availability zone with no failover or replication.

It 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"

## Other products of the same kind · 17

- [Microservices Engine](https://localhost:3000/catalogue/components/alibaba-mse.md) `alibaba-mse` — alibabacloud
- [AWS Cloud Map](https://localhost:3000/catalogue/components/aws-cloud-map.md) `aws-cloud-map` — aws
- [Azure Arc](https://localhost:3000/catalogue/components/azure-arc.md) `azure-arc` — azure
- [Azure Device Registry](https://localhost:3000/catalogue/components/azure-device-registry.md) `azure-device-registry` — azure
- [Apache Helix](https://localhost:3000/catalogue/components/apache-helix.md) `apache-helix` — default
- [Consul](https://localhost:3000/catalogue/components/consul.md) `consul` — default
- [Generic coordination service](https://localhost:3000/catalogue/components/coordination-service.md) `coordination-service` — default
- [etcd](https://localhost:3000/catalogue/components/etcd.md) `etcd` — default
- [Eureka](https://localhost:3000/catalogue/components/eureka.md) `eureka` — default
- [Nacos](https://localhost:3000/catalogue/components/nacos.md) `nacos` — default
- [Oxia](https://localhost:3000/catalogue/components/oxia.md) `oxia` — default
- [Apache ZooKeeper](https://localhost:3000/catalogue/components/zookeeper.md) `zookeeper` — default
- [Service Directory](https://localhost:3000/catalogue/components/google-service-directory.md) `google-service-directory` — gcp
- [Endpoints](https://localhost:3000/catalogue/components/k8s-endpoints.md) `k8s-endpoints` — k8s
- [OpenStack Blazar](https://localhost:3000/catalogue/components/openstack-blazar.md) `openstack-blazar` — openstack
- [OpenStack Cyborg](https://localhost:3000/catalogue/components/openstack-cyborg.md) `openstack-cyborg` — openstack
- [OpenStack Placement](https://localhost:3000/catalogue/components/openstack-placement.md) `openstack-placement` — openstack

## Use it in a design

```yaml
nodes:
  - { id: "cloudflare-durable-objects", component: "cloudflare-durable-objects" }
```

## Source (`component` YAML, verbatim)

```yaml
# yaml-language-server: $schema=../../schema/component.schema.json
# Durable Objects: named single-threaded objects that serialise access to their own storage, used as
# the coordination and locking primitive of the Workers platform. "Durable Objects - Limits" states
# new namespaces use the SQLite backend, each object is single-threaded, with 10 GB and ~1,000 rps.
schemaVersion: "1"
type: "component"
id: "cloudflare-durable-objects"
kind: "coordination-service"
provider: "cloudflare"
docs: "https://developers.cloudflare.com/durable-objects/platform/limits/"
defaults:
  managed: true
  role: "lock"
  consensus: "none"
properties:
  storageBackend:
    type: "enum"
    values: ["sqlite", "key-value"]
    default: "sqlite"
  singleThreaded:
    type: "boolean"
    default: true
  maxStorageGb:
    type: "integer"
    default: 10
  requestsPerSecondSoftLimit:
    type: "integer"
    default: 1000
```

Human page: https://localhost:3000/catalogue/components/cloudflare-durable-objects