How to terminate sub-orchestrations ?

[gsimardimt]

How can we terminate sub-orchestrations in isolated process ? By reading issue #4, I understand there is no plan to return an instance history. What would be the replacement for the following code ?

[FunctionName(nameof(Orchestration_StopInstance))]
public static async Task<IActionResult> Orchestration_StopInstance(
    [HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "orchestration/stop/{instanceId}")] HttpRequestMessage req,
    [DurableClient] IDurableOrchestrationClient orchestrationClient,
    string instanceId
)
{
    try
    {
        var durableOrchestrationStatus = await orchestrationClient.GetStatusAsync(instanceId, true, false, false);

        foreach (var subInstanceId in durableOrchestrationStatus.History.Select(t => t["InstanceId"]).Where(t => t != null))
        {
            await Orchestration_StopInstance(req, orchestrationClient, subInstanceId.ToString());
        }

        await orchestrationClient.TerminateAsync(instanceId, "Stopped");

        return new NoContentResult();
    }
    catch (Exception ex)
    {
        return new JsonResult(new Response(ex.Message.Trim())) { StatusCode = (int)HttpStatusCode.InternalServerError };
    }
}

[jviau]

Hi @gsimardimt - while not ideal, you can make and HTTP call to your own functions endpoint to get the orchestration history, and find sub-orchestration IDs that way: https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-http-api

In the future, we aim to solve your specific scenario by supporting orchestration cancellation (#7). No ETA on that though.

[gsimardimt]

Thank you for your suggestion. I also think that GetStatusAsync should return the instance history.

[jviau]

As mentioned in #4, we are hesitant to add this to public API surface. Instance history is more of an implementation detail, meant to be hidden from regular consumption. Individual backends are not really even supposed to be too aware of it. It is not something we are in a rush to expose and support as public API.

[YunchuWang]

#516 get instance history is supported now