Azure CosmosDB binding spec

Component format

To setup Azure CosmosDB binding create a component of type bindings.azure.cosmosdb. See this guide on how to create and apply a binding configuration.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
  namespace: <NAMESPACE>
spec:
  type: bindings.azure.cosmosdb
  version: v1
  metadata:
  - name: url
    value: https://******.documents.azure.com:443/
  - name: masterKey
    value: *****
  - name: database
    value: db
  - name: collection
    value: collection
  - name: partitionKey
    value: message

Spec metadata fields

For more information see Azure Cosmos DB resource model.

Binding support

This component supports output binding with the following operations:

• create

Best Practices for Production Use

Azure Cosmos DB shares a strict metadata request rate limit across all databases in a single Azure Cosmos DB account. New connections to Azure Cosmos DB assume a large percentage of the allowable request rate limit. (See the CosmosDB documentation)

Therefore several strategies must be applied to avoid simultaneous new connections to Azure Cosmos DB:

• Ensure sidecars of applications only load the Azure Cosmos DB component when they require it to avoid unnecessary database connections. This can be done by scoping your components to specific applications.
• Choose deployment strategies that sequentially deploy or start your applications to minimize bursts in new connections to your Azure Cosmos DB accounts.
• Avoid reusing the same Azure Cosmos DB account for unrelated databases or systems (even outside of Dapr). Distinct Azure Cosmos DB accounts have distinct rate limits.
• Increase the initTimeout value to allow the component to retry connecting to Azure Cosmos DB during side car initialization for up to 5 minutes. The default value is 5s and should be increased. When using Kubernetes, increasing this value may also require an update to your Readiness and Liveness probes.

spec:
  type: bindings.azure.cosmosdb
  version: v1
  initTimeout: 5m
  metadata:

Data format

The output binding create operation requires the following keys to exist in the payload of every document to be created:

• id: a unique ID for the document to be created
• <partitionKey>: the name of the partition key specified via the spec.partitionKey in the component definition. This must also match the partition key specified upon creation of the Cosmos DB container.

Related links

• Basic schema for a Dapr component
• Bindings building block
• How-To: Trigger application with input binding
• How-To: Use bindings to interface with external resources
• Bindings API reference