How-To dynamically add partitions

It means “Update the value of the partition count”.

Using the Resource Manager Template

{
        "apiVersion": "2017-04-01",
        "type": "Microsoft.EventHub/namespaces/eventhubs",
        "name": "[concat(parameters('namespaceName'), '/', parameters('eventHubName'))]",
        "location": "[parameters('location')]",
        "dependsOn": [
            "[resourceId('Microsoft.EventHub/namespaces', parameters('namespaceName'))]"
        ],
        "properties": {
            "messageRetentionInDays": 7,
            "partitionCount": 12
        }
    }

Using PowerShell

Use the Set-AzEventHub PowerShell command to update partitions in an event hub.

Example 1

Set-AzEventHub -ResourceGroupName MyResourceGroupName -Namespace MyNamespaceName -Name MyEventHubName -InputObject MyCreatedEventHub -messageRetentionInDays 4 -partitionCount 2

Example 2

$createdEventHub = Get-AzEventHub -ResourceGroupName MyResourceGroupName -Namespace MyNamespaceName -Name MyCreatedEventHub
$ceatedEventHub.CaptureDescription = New-Object -TypeName Microsoft.Azure.Commands.EventHub.Models.PSCaptureDescriptionAttributes
$createdEventHub.CaptureDescription.Enabled = $true
$createdEventHub.CaptureDescription.IntervalInSeconds  = 120
$createdEventHub.CaptureDescription.Encoding  = "Avro"
$createdEventHub.CaptureDescription.SizeLimitInBytes = 10485763
$createdEventHub.CaptureDescription.Destination.Name = "EventHubArchive.AzureBlockBlob"
$createdEventHub.CaptureDescription.Destination.BlobContainer = "container"
$createdEventHub.CaptureDescription.Destination.ArchiveNameFormat = "{Namespace}/{EventHub}/{PartitionId}/{Year}/{Month}/{Day}/{Hour}/{Minute}/{Second}"
$createdEventHub.CaptureDescription.Destination.StorageAccountResourceId = "/subscriptions/{SubscriptionId}/resourceGroups/MyResourceGroupName/providers/Microsoft.ClassicStorage/storageAccounts/arjunteststorage"
Set-AzEventHub -ResourceGroupName MyResourceGroupName -Namespace MyNamespaceName -Name MyEventHubName -InputObject $createdEventHub