[Go-essp-tech] Replica support in Gateway 2.0

Thu Nov 10 09:54:59 MST 2011

Hello Karl,

Unfortunately not. We can say "please don't touch the files once you've published" to the data node managers, but we can't tell the users that this is a guarantee. The checksums in the catalogue do not guarantee that the underlying files have not been changed,

Cheers,
Martin

From: go-essp-tech-bounces at ucar.edu [mailto:go-essp-tech-bounces at ucar.edu] On Behalf Of Karl Taylor
Sent: 10 November 2011 16:52
To: go-essp-tech at ucar.edu
Subject: Re: [Go-essp-tech] Replica support in Gateway 2.0

Dear all,

If we guard against "replicas" appearing in ESG that have a different checksum from the original, then the same QC status should apply to all replicas and it shouldn't matter which one we point to as having passed a given QC level.

This seems to be another argument to add checksums to all datasets as soon as we can.  Once this happens, wouldn't that mean that the current gateways are adequate?

cheers,
Karl

On 11/10/11 7:15 AM, Bryan Lawrence wrote:

Martin has been quite vociferous (quite rightly) in personal email to me that as far as QC goes, the dataset which gets through QC2 will *not* be the original dataset - we have no control over the original dataset's permanence and/or immutability.

This raises some interesting issues about the role of ESGF ... and it's interaction with the data owner and the publication process which is governed by DKRZ as the Publisher (and in the future probably multiple publication processes and multiple Publishers). The correct analogy here, as I said on an earlier email today, is to consider the original dataset as a preprint, of a Published dataset (at QC level 3).

Incidentally, this disctinction might offer us a possible (distinct) future for two different types of gateways into ESGF: the Published datasets view (which makes pre-eminent the QC'd copy) and the published view (which makes pre-eminenent whatever someone sticks on a data node).

But meanwhile, I think we can live with what you proposed, as long as the QC status of the replicas is clearly visible - and the DOI points to a landing page that somehow prioritises those versions, which would be trivial if your page was organised in the same way (prioritising the replicants of QC level 3, then replicants of QC level 2, and then originals).

Cheers

Bryan

Hi Stephen,

On 11/10/2011 05:23 AM, stephen.pascoe at stfc.ac.uk<mailto:stephen.pascoe at stfc.ac.uk> wrote:

Hi Eric,

Replicas are beginning to show up in CMIP5 and this is exposing some

gaps in what Gateway 1.x can do. I know you are reimplementing replica

support in Gateway 2.0 so I'd like to raise these issues now.

We need to be able to publish a replica to the same Gateway that hosts

the original. I can't imagine this being possible with Gateway 1.x since

the URL http://<GATEWAY>/dataset/<dataset-id>.html only points to one

dataset on that Gateway. Either that page needs to link to the original

and all replicas for that dataset or we need separate URLs for each

replica/original, or both.

The current direction for the implementation would be to have a 1 page

for the original dataset and have that page list where replicas are

located.

If there are use cases for the other options we should get those identified.

Thanks!

-Nate

Is this part of your design for Gateway 2.0's replica support?

Thanks,

Stephen.

---

Stephen Pascoe +44 (0)1235 445980

Centre of Environmental Data Archival

STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot OX11 0QX, UK

--

Scanned by iCritical.

_______________________________________________

GO-ESSP-TECH mailing list

GO-ESSP-TECH at ucar.edu<mailto:GO-ESSP-TECH at ucar.edu>

http://mailman.ucar.edu/mailman/listinfo/go-essp-tech

_______________________________________________

GO-ESSP-TECH mailing list

GO-ESSP-TECH at ucar.edu<mailto:GO-ESSP-TECH at ucar.edu>

http://mailman.ucar.edu/mailman/listinfo/go-essp-tech

--

Bryan Lawrence

University of Reading:  Professor of Weather and Climate Computing.

National Centre for Atmospheric Science: Director of Models and Data.

STFC: Director of the Centre for Environmental Data Archival.

Ph: +44 118 3786507 or 1235 445012; Web:home.badc.rl.ac.uk/lawrence

_______________________________________________

GO-ESSP-TECH mailing list

GO-ESSP-TECH at ucar.edu<mailto:GO-ESSP-TECH at ucar.edu>

http://mailman.ucar.edu/mailman/listinfo/go-essp-tech

-- 
Scanned by iCritical.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/go-essp-tech/attachments/20111110/a0581e99/attachment-0001.html 