[GeoNode-devel] download original datasets feature randomly fails

[Alessio Fabiani]

Hello Paolo,
don't know exactly why is failing in your case, it is usually working, at
least on my experience.

However, the idea is the following.
All the download methods exposed on GeoNode, relies on OGC calls. For
vectors WFS, raster WCS and other formats WMS.
That means that you overload GeoServer and potentially, especially for huge
datasets, a single download can stuck your server by consuming all the
machine resources available.
Notice also that GeoServer always does a format conversion when you ask for
a raw data format.

The latest versions of GeoServer have some protection mechanisms allowing
you to configure the cap of resources to be consumed.
That means that for big datasets the download won't be allowed at all.

The intention of "Original Dataset" download link, is to allow GeoNode to
package the uploaded files into the filesystem along with all the SLDs
defined and metadata formats, and send back to the user
without making OGC requests.
Of course this will successfully work only if:

1. The original uploaded file still exists and it is accessible on the
filesystem
2. The layer is not a pure table on a DB but has a file associated with it

Other than this, and this could be the cause why it is failing in your
case, the "upload session" metadata stored on GeoNode database should point
to the correct original files uploaded into GeoNode.

That said, if you have the chance to investigate a bit more on the cause of
the failures, we can try to make it a bit more reliable.

Cheers,
A.




Il giorno ven 17 mag 2019 alle ore 00:41 Paolo Corti <pcorti at gmail.com> ha
scritto:

> Hi devs
> when downloading a layer, "Zipped Shapefile" works as expected, while
> "Original Datasets" randomly fails. Also, I am not sure what is the
> latter for: when I am able to download it successfully, I see a zip
> file containing a bunch of .sld and geojson file.
> Would be glad to learn more about this
> thanks
> Paolo
>
> --
> Paolo Corti
> Geospatial software developer
> web: http://www.paolocorti.net
> twitter: @capooti
> skype: capooti
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