[kepler-dev] Questions/Thoughts on the modular system

[Matt Jones]

Hi Ilkay,

Good questions.... my perspective below....

On Fri, Aug 21, 2009 at 12:31 PM, Ilkay Altintas<altintas at sdsc.edu> wrote:
>
> The new modular system mostly works great and I like the new organization of
> files.
> I have a few questions/comments below on capabilities that I think are key
> to the broad usability of it.
> 1. Module dependencies/conflicts: How do I know different modules depend on
> each other or would conflict with each other? Do we expect the users to
> download any module and add it into their build? We need documentation with
> each module on what are the pre-conditions for using that module: an example
> configuration for the module, list of what other modules NOT to use it with,
> and what is required with this module. We need to define standards for
> publishing a module.
I agree we need these dependencies to be explicit and trackable.

> 2. Module manager: I understand there will be a visual module manager for
> this. Will the manager take care of some of the issues?
yes, I think module-manager will be the approach here.

> 3. Jar conflicts: If two modules need different versions of the same jar, it
> will not cause compile errors. However, it could end up causing jar
> conflicts at runtime. How do we deal with this problem? What's going to
> happen when third parties start publishing modules?
I think jar files (or small related collections of jar files) should
often be published as their own modules to facilitate much mroe
explicit dependency checking on jars.  Without it, these incidental
jar overrides are indeed a problem.

Matt

> Thank you and apologies if some of these were discussed before.
> -ilkay
>
> --
> Ilkay ALTINTAS
> Deputy Coordinator for Research, San Diego Supercomputer Center (SDSC)
> Lab Director, Scientific Workflow Automation Technologies (SWAT @ SDSC)
>
> University of California, San Diego
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> Web: http://users.sdsc.edu/~altintas
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Matthew B. Jones
Director of Informatics Research and Development
National Center for Ecological Analysis and Synthesis (NCEAS)
UC Santa Barbara
jones at nceas.ucsb.edu                       Ph: 1-907-523-1960
http://www.nceas.ucsb.edu/ecoinfo
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