[Swift-devel] Swift staging method names

[Tim Armstrong]

I agree, I don't think the names give a good idea of what they're about.  I
also feel like it's difficult to explain some of these without diagrams.

- Tim


On Mon, Aug 11, 2014 at 3:34 PM, Yadu Nand <yadudoc1729 at gmail.com> wrote:

> Hi Everyone,
>
> In the current conventions for staging, we are calling what used to be
> proxy staging method as local, which I think is counter-intuitive, when
> local staging is actually staging to remote sites.
>
> Staging method "swift" does not give any idea about what it actually does
> either.
>
> I'm pasting the staging methods table from the documentation below.
>
> Staging MethodDescription
>
> swift
>
> This method instructs Swift to use a filesystem provider to direct all
> necessary staging operations from the Swift client-side to the cluster head
> node. If this method is used, the workDirectory must point to a head node
> path that is on a shared file system accessible by the compute nodes.
>
> wrapper
>
> File staging is done by the Swift application wrapper
>
> local
>
> Used to indicate that files should be staged in/out from/to the site on
> which Swift is running. In the case of Swift Coasters, the system proxies
> the tranfers between client side and compute nodes through the Coaster
> Service.
>
> service-local
>
> This method instructs the execution mechanism provider to stage input and
> output files from the remote site where the execution service is located.
> For example, if a Coaster Service is started on the login node of a
> cluster, the Coaster Service will perform the staging from a file system on
> the login node to the compute node and back.
>
> shared-fs
>
> This method is used by Coasters to implement a simple staging mechanism in
> which files are accessed using a shared filesystem that is accessible by
> compute nodes
>
>
> ​Thanks,​
> Yadu Nand B
>
>
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