[THREDDS #PSU-730086]: Error code 500: message= "NcSDArray InvalidRangeException=Number of ranges in section (2) must be = 3"

questions are below:
 
original catalog:

    <datasetFmrc name="RTOFS Forecast Model Run Collection" path="fmrc/rtofs">
      <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
         <aggregation dimName="runtime" type="forecastModelRunSingleCollection" 
timeUnitsChange="true" recheckEvery="10min">
            <scanFmrc location="/usgs/data0/rsignell/models/rtofs" 
regExp=".*ofs_atl.*\.grib2$" 
             runDateMatcher="#ofs.#yyyyMMdd" 
forecastOffsetMatcher="HHH#.grb.grib2#" subdirs="true"
             olderThan="10 min"/> 
           <variable name="lat_rho" orgName="Latitude_of_Pressure_Point" 
shape="y x" type="float">
             <attribute name="units" value="degrees_north"/>
           </variable>
           <variable name="lat_u" 
orgName="Latitude_of_U_Wind_Component_of_Velocity" shape="y x" type="float">
             <attribute name="units" value="degrees_north"/>
           </variable>
           <variable name="lat_v" 
orgName="Latitude_of_V_Wind_Component_of_Velocity" shape="y x" type="float">
             <attribute name="units" value="degrees_north"/>
           </variable>
           <variable name="lon_rho" orgName="Longitude_of_Pressure_Point" 
shape="y x" type="float">
             <attribute name="units" value="degrees_east"/>
           </variable>
           <variable name="lon_u" 
orgName="Longitude_of_U_Wind_Component_of_Velocity" shape="y x" type="float">
             <attribute name="units" value="degrees_east"/>
           </variable>
           <variable name="lon_v" 
orgName="Longitude_of_V_Wind_Component_of_Velocity" shape="y x" type="float">
             <attribute name="units" value="degrees_east"/>
           </variable>
           <variable name="mixed_layer_depth" shape="time y x" type="float">
             <attribute name="coordinates" value="lon_rho lat_rho"/>
             <attribute name="long_name" value="mixed_layer_depth @ surface"/>
             <attribute name="units" value="m"/>
             <attribute name="missing_value" type="float" value="NaN"/>
             <remove type="attribute" name="grid_mapping"/>
           </variable>
           
           <variable name="zeta" orgName="Sea_Surface_Height_Relative_to_Geoid" 
shape="time y x" type="float">
             <attribute name="long_name" 
value="Sea_Surface_Height_Relative_to_Geoid @ surface"/>
             <attribute name="units" value="m"/>
             <attribute name="missing_value" type="float" value="NaN"/>
             <remove type="attribute" name="grid_mapping"/>
           </variable>
           
           <variable name="salt" orgName="Three-D_Salinity" shape="time 
depth_below_sea y x" type="float">
             <attribute name="coordinates" value="lat_rho lon_rho"/>
             <attribute name="long_name" value="Three-D_Salinity @ 
depth_below_sea"/>
             <attribute name="units" value="1"/>
             <attribute name="missing_value" type="float" value="NaN"/>
             <remove type="attribute" name="grid_mapping"/>
           </variable>
           
           <variable name="temp" orgName="Three-D_Temperature" shape="time 
depth_below_sea y x" type="float">
             <attribute name="coordinates" value="lat_rho lon_rho"/>
             <attribute name="long_name" value="Three-D_Temperature @ 
depth_below_sea"/>
             <attribute name="units" value="Celcius"/>
             <attribute name="missing_value" type="float" value="NaN"/>
             <remove type="attribute" name="grid_mapping"/>
           </variable>
           
           <variable name="u" orgName="U-component_of_current" shape="time 
depth_below_sea y x" type="float">
             <attribute name="coordinates" value="lat_u lon_u"/>
             <attribute name="long_name" value="U-component_of_current @ 
depth_below_sea"/>
             <attribute name="units" value="m s-1"/>
             <attribute name="missing_value" type="float" value="NaN"/>
             <attribute name="grid_mapping" 
value="Curvilinear_Orthogonal_Grid"/>
             
           </variable>
           <variable name="v" orgName="V-component_of_current" shape="time 
depth_below_sea y x" type="float">
             <attribute name="coordinates" value="lat_v lon_v"/>
             <attribute name="long_name" value="V-component_of_current @ 
depth_below_sea"/>
             <attribute name="units" value="m s-1"/>
             <attribute name="missing_value" type="float" value="NaN"/>
             <remove type="attribute" name="grid_mapping"/>
           </variable>
           
           <variable name="Vertical_velocity_geometric" shape="time 
depth_below_sea y x" type="float">
             <attribute name="coordinates" value="lat_rho lon_rho"/>
             <attribute name="long_name" value="Vertical_velocity_geometric @ 
depth_below_sea"/>
             <attribute name="units" value="m s-1"/>
             <attribute name="missing_value" type="float" value="NaN"/>
             <remove type="attribute" name="grid_mapping"/>
           </variable>
         </aggregation>
      </netcdf>
      </datasetFmrc>

1) the ncml mostly looks like you are renaming variables? anything else going 
on? 

most of the problems went away when we started to support Curvilinear 
Orthogonal grids (strange ones, them).

other than that, the new catalog could look like:

<featureCollection featureType="FMRC"  name="RTOFS Forecast Model Run 
Collection" path="fmrc/rtofs">

  <collection spec="/usgs/data0/rsignell/models/rtofs/**/*.grib2"
                       recheckEvery="10 min"
                       olderThan="10 min" /> 

</featureCollection>

2) since they are grib files, they have the run/forecast dates inside and we 
dont need to parse the filenames (safer that way, less cognitive burden to get 
the regexp right). files are opened first time and metadata is cached. can you 
give me an idea of how many files there are? when do files get added or deleted 
?

3) current default is to expose (in the catalog) the 2D fmrc dataset, the 
"best" dataset, and the component files. What would you want different?


Ticket Details
===================
Ticket ID: PSU-730086
Department: Support THREDDS
Priority: Critical
Status: Open