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Scale applications based on the count of blobs in a given Azure Blob Storage container.
Notice
As of now, this Azure Blob Storage scaler scales based on the count of the blobs in a container as opposed to the Azure Functions behavior where code is only triggered on new blobs.
Trigger Specification
This specification describes the azure-blob trigger for Azure Blob Storage. It scales based on the count of blobs in a given blob storage container and assumes the worker is responsible for clearing the container by deleting/moving the blobs once the blob processing completed.
triggers:
- type: azure-blob
metadata:
blobContainerName: functions-blob
blobCount: '5'
connectionFromEnv: STORAGE_CONNECTIONSTRING_ENV_NAME
accountName: storage-account-name
blobPrefix: myprefix
blobDelimiter: /example
Parameter list:
blobContainerName- Name of container in an Azure Storage account.blobCount- Average target value to trigger scaling actions. (Default:5, Optional)connectionFromEnv- Name of the environment variable your deployment uses to get the connection string.accountName- Name of the storage account taht the container belongs to.blobPrefix- Prefix for the Blob. Use this to specify sub path for the blobs if required. (Default:"", Optional)blobDelimiter- Delimiter for identifying the blob prefix. (Default:/, Optional)
Authentication Parameters
You can authenticate by using pod identity or connection string authentication.
Connection String Authentication:
connection- Connection string for Azure Storage Account.
Pod Identity Authentication
accountName- Name of the Azure Storage Account.
Example
apiVersion: keda.sh/v1alpha1
kind: TriggerAuthentication
metadata:
name: azure-blob-auth
spec:
podIdentity:
provider: azure
---
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
name: azure-blob-scaledobject
namespace: default
spec:
scaleTargetRef:
name: azureblob-function
triggers:
- type: azure-blob
metadata:
# Required
blobContainerName: functionsblob
# Optional, required when pod identity is used
accountName: storage-account-name
# Optional, connection OR authenticationRef that defines the connection
connectionFromEnv: STORAGE_CONNECTIONSTRING_ENV_NAME # Reference to a connection string in deployment
# or authenticationRef as defined below
#
# Optional
blobCount: "5" # default 5
blobPrefix: blobsubpath # Default : ""
blobDelimiter: "/" # Default: "/"
authenticationRef:
name: azure-blob-auth # authenticationRef would need either podIdentity or define a connection parameter