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From Lahiru Gunathilake <>
Subject Re: Implementing the cancel/terminate
Date Mon, 21 Apr 2014 18:11:05 GMT
Hi Raman,

On Mon, Apr 21, 2014 at 10:35 AM, Raminder Singh

>  Thanks for investigation the problem and working through solution. This
> is really required for the production gateways like Ultrascan.
> In the current architecture where we have job submission(provider) and
> monitoring separate, job cancel request need not to go to GFAC provider.
> Provider submits the jobs and handover the job id to the orchestrator.
> Orchestrator works with the job monitoring to maintain the job state. Now
> the cancel need to be handled by Orchestrator and Monitoring. That will
> change the course of action for API to cancel a job.
> I dont' think so, Orchestrator can invoke GFac Provider level job
cancellation and it should simply reflect in the monitor when it try to get
the status of that job( once its got to know by the monitor it should stop
monitoring that job) and without modifying the monitor everything should
work. There is no need to touch the monitor.

I think Job cancellation should be a functionality of GFAC Provider and it
should be similar to job submission where you can do pre processing and
post processing after job cancellation operation.

> One important requirement to take care is cleanup task after the job is
> canceled like updating the job status table and updating the status.
> Thanks
> Raminder
> On Apr 21, 2014, at 9:06 AM, Saminda Wijeratne <> wrote:
>  Hi All,
> After looking at the current design and doing some trial and error I
> thought of implementing the cancellation as follows.
>    - Cancellation of an experiment requested by a gateway requires
>    cancellation request to go through several layers. (Orchestrator > GFac >
>    GFac Provider)
>    - Each layer is responsible for handling cancellation relevant for
>    that layer (Orchestration cancels experiment, GFac cancels Task, GFac
>    Provider cancels Job)
>    - What I thought is, each layer will listen to cancellation request
>    made to the layer above and perform its cancellation actions accordingly.
>    (GFac will see the experiment is having the status "canceling" for an
>    experiment id and it will perform cancellation of the tasks relevant for
>    that experiment)
>       - Effectively the Orchestrator will be
>       - updating the status of the experiment in registry with the status
>          "canceling"
>          - publish a message which will be caught by GFac instance which
>          handles its Tasks.
>          - GFac will perform the same and the correct GFac Provider
>       instance will catch the message and perform the actual job cancellation.
>    - Once the job cancellation is done the statuses at each layer will be
>    updated (to "canceled") in  similar fashion.
>    - We allow the API call of cancellation to be asynchronous
>    - I'm hoping to use the MonitorPublisher implemented by Lahiru to
>    publish the messages.
> wdyt?
> Thanks,
> Saminda

System Analyst Programmer
Indiana University

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