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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