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Re: [las_users] LAS 8.6.3 issues with large aggregations



Hi Ajay,

I see that as of yesterday, Unidata has announced a release of NetCDF 4.6.2.  We'll build that, and see where we are with respect to this.

In general we link NetCDF statically into ferret/PyFerret.  This is for a couple of reasons. Ferret offers netcdf-4 features, and operating systems don't always have netcdf-4 installed (I think this is still the case, though maybe less so nowadays).  Also, at various times there have been particular netCDF bugs or behaviors that we knew about and wanted to link with a particular version. Assuming that this release fixes our issues here, this will be such a case, where we've got the one linked in that we know is working. 

Ansley

On 11/20/2018 10:24 AM, Ajay Krishnan - NOAA Affiliate wrote:
Martin, 
Thank you for your response! It's good to know that other users are experiencing the same issues.

Ansley,
Yes I agree. Was wondering which of these issues are related to the NetCDF-C libraries. Since I am not well versed in Ferret, how do we link to a different version of the NetCDF-C library without having to upgrade Ferret? 


On Tue, Nov 20, 2018 at 12:46 PM Ansley C. Manke <ansley.b.manke@xxxxxxxx> wrote:

Hi Ajay,

This doesn't have to do with LAS but with the netCDF libraries linked with the Ferret/Pyferret executable.  We've seen it  reported this to Unidata earlier this month, and they've said they're looking into it.

Ansley


On 11/19/2018 8:53 AM, Ajay Krishnan - NOAA Affiliate wrote:
Ever since we upgraded our LAS to 8.6.3, some of our large aggregations which ran perfectly fine on the old instance (v7.2) keep breaking with very generic OPeNDAP errors.

For e.g.:
Unfortunately, we cannot provide what you have asked for.
A remote server was unable to deliver the data LAS needs to make your product.


LAS was trying to access these servers:
  1. https://data.nodc.noaa.gov/thredds/dodsC/las/id-a074156616/data_https___data.nodc.noaa.gov_thredds_dodsC_ncml_ghrsst_ncml_fullAgg_aggregate__ghrsst_L4_GLOB_UKMO_OSTIA_20170605.ncml.jnl
Advanced users may see more technical information.  

url error details: 
 **netCDF error
             NetCDF: I/O failure (OPeNDAP/netCDF Error code -68)
             Data set: https://data.nodc.noaa.gov/thredds/dodsC/ncml/ghrsst_ncml/fullAgg/aggregate__ghrsst_L4_GLOB_UKMO_OSTIA_20170605.ncml
SET DATA "https://data.nodc.noaa.gov/thredds/dodsC/ncml/ghrsst_ncml/fullAgg/aggregate__ghrsst_L4_GLOB_UKMO_OSTIA_20170605.ncml"
Command file, command group, or REPEAT execution aborted
ERROR RUNNING SCRIPT
Nothing in the THREDDS logs seem to indicate any issues with the NCML file. Anyone else experience such issues? Any solution?
Thanks!
-- 
Ajay Krishnan
Geospatial Data Developer | Science & Technology Corporation - Federal Government Contractor NOAA National Centers for Environmental Information (NCEI)
Customer Support:  1-301-713-3277 or ncei.info@xxxxxxxx


--
Ajay Krishnan
Geospatial Data Developer | Science & Technology Corporation - Federal Government Contractor NOAA National Centers for Environmental Information (NCEI)
Customer Support:  1-301-713-3277 or ncei.info@xxxxxxxx

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