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From Saminda Wijeratne <samin...@gmail.com>
Subject Re: Implementing the cancel/terminate
Date Tue, 22 Apr 2014 22:26:53 GMT
You mean like a monitoring client at client end triggering a listener?


On Tue, Apr 22, 2014 at 5:22 PM, Suresh Marru <smarru@apache.org> wrote:

> Hi Saminda,
>
> This like a good plan, I think we should make sure the API server properly
> reports these statuses back to the clients.
>
> Suresh
>
> On Apr 21, 2014, at 9:06 AM, Saminda Wijeratne <samindaw@gmail.com> 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
>
>
>
>

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