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From Lahiru Gunathilake <glah...@gmail.com>
Subject Re: Importance of Orchestrator Component for CIPRES+Airavata Integration
Date Sun, 19 Jan 2014 21:56:57 GMT
Thank you saminda for the clear information !

Regards
Lahiru


On Fri, Jan 17, 2014 at 1:55 PM, Saminda Wijeratne <samindaw@gmail.com>wrote:

> Hi Devs,
>
> These days we are working on an initial effort of integrating Airavata to
> CIPRES gateway backend. Following is a short review of CIPRES requirements
> against Orchestrator component design.
> (For a full list of CIPRES usecases related to Airavata integration please
> view [1].)
>
> *Single Job execution vs Workflow execution*
> Orchestrator supporting the single job executions benefits gateways like
> CIPRES, NSG and Ultrascan since it removes the unintended overhead of
> executing and managing a workflow context which is not required for those
> gateways. The status, the progress messages, IDs and commands
> (launch/cancel/retry) of an experiment directly correspond to the job
> submissions/executions which these gateways interested in.
>
> *Functional Requirements*
> The orchestrator component supports 2 main functions which CIPRES requires
> in relating to managing its user tasks. Job submission and cancellation.
> Additional requirements relating to data management and progress/status
> monitoring will be further discussed in order to determine the involvement
> of orchestrator component to support them or not.
>
> *Exposed API functions*
> Current AiravataAPI ExecutionManager exposes workflow execution API
> functions. While the functions themselves do not distinguish this fact
> (i.e. runExperiment(...)), it is evident that this could confuse the
> gateway developer in understanding how to specify that he/she intends to
> run a single job and not a workflow. Thus for such single jobs a seperate
> launch (or run) API function is required. However the rest of the
> functionalities such as cancel, retrieve progress and provenance data can
> be managed via the existing API functions since the concept of experiment
> ID is common for single jobs and workflows.
>
> *Accessing the Orchestrator by the gateway*
> Although we have an Orchestrator API designed at the moment thoughts are
> to expose an "Orchestrator Service" for the gateway developers to work
> with. This will most probably be a thrift service which would give the
> gateway developers the benefit of having a thrift client of their own
> programming language.
>
> Other than what was discussed in google hangout sessions and mail threads,
> I do not see any other design flaws or improvements in the Orchestrator
> with relating to CIPRES needs. But we need to soon start using the
> component in CIPRES in order to get more feedback. I will update this mail
> once I start doing that in the coming weeks.
>
> Thanks,
> Saminda
>
> 1.
> https://docs.google.com/document/d/1t0dqUgknIO9OgR-INIMccyYQP_KukzNmDMXdsVv0oSc/edit#
>



-- 
System Analyst Programmer
PTI Lab
Indiana University

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