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[netCDFJava #OSY-357654]: delays in opening remote NCML file

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  • Subject: [netCDFJava #OSY-357654]: delays in opening remote NCML file
  • Date: Sun, 03 Dec 2017 12:50:18 -0700
How long does the browser take if you access the .dods e.g.
https://dataserver.nccs.nasa.gov/thredds/dodsC/bypass/CREATE-IP/reanalysis/CFSR/6hr/atmos/psl.ncml.dods

> 
> I'm tracking a performance problem down for Brian Mapes (cc'ed). He has an
> ncml file that aggregates a number of ncml files and it takes a very very
> long time to open the file.
> 
> Just looking at one of the NCML links that is being accessed:
> 
> https://dataserver.nccs.nasa.gov/thredds/dodsC/bypass/CREATE-IP/reanalysis/CFSR/6hr/atmos/psl.ncml
> 
> In the browser it is sub-second to access the .das of this file. However,
> running CURL or the IDV's IOUtil.readcontents it takes ~10 seconds to
> fetch.  Running ucar.nc2.dt.grid.GridDataset.open it takes ~ 80 seconds to
> open the link
> 
> Any ideas?
> 
> -Jeff
> 
> 

=Dennis Heimbigner
  Unidata


Ticket Details
===================
Ticket ID: OSY-357654
Department: Support netCDF Java
Priority: Normal
Status: Open
===================
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