Re: [thredds] WCS problem in THREDDS ESGF-5.0.1

• To: thredds@xxxxxxxxxxxxxxxx
• Subject: Re: [thredds] WCS problem in THREDDS ESGF-5.0.1
• From: Antonio S. Cofiño <cofinoa@xxxxxxxxx>
• Date: Fri, 19 Jan 2018 14:00:35 +0100

Regards

Antonio


On 19/01/18 13:46, Antonio S. Cofiño wrote:

Joe,

Take a look to this issue at GitHub:

https://github.com/Unidata/thredds/issues/618

that fixes and issue with edal-java component, but with the last release has appear again

https://github.com/Unidata/thredds/issues/977

Antonio



On 18/01/18 14:23, joe.singleton@xxxxxxxxxx wrote:

Hi all,

I am having problems using WCS with an NcML dataset in THREDDS version
ESGF-5.0.1. WCS seems to work fine for datasets corresponding to actual files,
but not when aggregating datasets with NcML. The WCS endpoint returns the
following response:

   <?xml version="1.0" encoding="UTF-8"?>
   <ServiceExceptionReport xmlns="http://www.opengis.net/ogc";  version="1.2.0">
     <ServiceException>Unknown problem</ServiceException>
   </ServiceExceptionReport>

Some errors are logged in threddsServlet.log (full log attached):

   2018-01-18T12:59:54.951 +0000 [    555825][      16] ERROR - 
thredds.server.wcs.WcsHandler - Unknown problem.
   java.io.FileNotFoundException: Not a Grid Dataset test_aggregate_dataset 
err=/var/lib/tomcat/content/thredds/public/testdata/_aggregate_dataset (No such 
file or directory)

My <dataset> element in the root catalog.xml is:

   <dataset name="Aggregation" ID="test_aggregate_dataset">
     <access serviceName="all" urlPath="test_aggregate_dataset"/>
     <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";
             
location="/var/lib/tomcat/content/thredds/public/testdata/cci/agg.ncml"/>
   </dataset>

and the referenced NcML contains the following:

   <?xml version="1.0" encoding="UTF-8"?>
   <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
     <aggregation dimName="time" type="joinExisting">
       <variableAgg name="time"/>
       <netcdf 
location='/var/lib/tomcat/content/thredds/public/testdata/cci/ESACCI-SOILMOISTURE-L3S-SSMS-ACTIVE-19910805000000-fv02.2.nc'/>
       <netcdf 
location='/var/lib/tomcat/content/thredds/public/testdata/cci/ESACCI-SOILMOISTURE-L3S-SSMS-ACTIVE-19910806000000-fv02.2.nc'/>
       <netcdf 
location='/var/lib/tomcat/content/thredds/public/testdata/cci/ESACCI-SOILMOISTURE-L3S-SSMS-ACTIVE-19910807000000-fv02.2.nc'/>
       <netcdf 
location='/var/lib/tomcat/content/thredds/public/testdata/cci/ESACCI-SOILMOISTURE-L3S-SSMS-ACTIVE-19910808000000-fv02.2.nc'/>
       <netcdf 
location='/var/lib/tomcat/content/thredds/public/testdata/cci/ESACCI-SOILMOISTURE-L3S-SSMS-ACTIVE-19910809000000-fv02.2.nc'/>
     </aggregation>
   </netcdf>

The referenced datasets exist and are readable by the tomcat user, and when
adding a <dataset> element for one of them directly it can be accessed through
WCS with no problem.

Also, the same aggregation works correctly via WMS, so I think the aggregation
setup is fine.

Looking at the output of strace it seems that THREDDS is trying to stat
'/var/lib/tomcat/webapps/thredds/wcs/test_aggregate_dataset', and open
'/var/lib/tomcat/content/thredds/public/testdata/_aggregate_dataset', both of
which do not exist. I suppose this is what causes the exception logged in the
log file.

If anyone can help at all it would be greatly appreciated.

Thanks,
Joe




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  • [thredds] WCS problem in THREDDS ESGF-5.0.1
    • From: joe.singleton
  • Re: [thredds] WCS problem in THREDDS ESGF-5.0.1
    • From: Antonio S . Cofiño