[THREDDS #NAV-696054]: Any hack for file that is overwritten each day?

["Unidata THREDDS Support" <support-thredds@xxxxxxxxxxxxxxxx>]

Hi Rich,

John is out the rest of the week, so I'll answer this one.
 
> I was going to announce this to all the IOOS gang, but before I do, I
> realized that I don't really know if we have to have a the datasetRoot
> or not.  I had never used datasetRoot because it seemed just a way to
> create a shorter URL, which didn't seem that useful.
> 
> So if it's in the datasetRoot, anything that uses that root will not
> be cached right?
> 
> Can we also add cache="false" to <dataset> and not have the <datasetRoot>?

Bottom line: <datasetRoot> is required for any dataset you want to serve that 
isn't configured by a <datasetScan> or an aggregation.

More detail ...

datasetRoot, like datasetScan, provides the TDS with the mapping between the 
URL and the location on disk. So for John's example:

> > Â<datasetRoot path="testN" location="/content/data/" cache="false" />

the file /content/data/file.nc would be served when a request came in for the 
URL ".../testN/file.nc". Without the datasetRoot element, the TDS would not 
know how to locate the file when the request came in.

The way the dataset references the datasetRoot is by starting its urlPath with 
the path of the datasetRoot. So the dataset from the above would look like:

<dataset ID='coolData' name="Cool Data" urlPath="testN/file.nc">...</dataset>

Hope that makes sense,

Ethan


Ticket Details
===================
Ticket ID: NAV-696054
Department: Support THREDDS
Priority: Normal
Status: Closed