Re: LAS 6.2.1 unable to access DODS served data

[Joe McLean <joe.mclean@xxxxxxxx>]

Hi Cyndy,

LAS v6.2.1 contains an added DODS feature which sets the DODS .dodsrc configuration file and .dods_cache cache directory to las/server/dods/.  When you ran the LAS configure script, you might have noticed the creation of these.  When we upgraded to RH9 we noticed some strange behavior concerning DODS caching.  My recollection is that changing the .dodsrc DODS parameter "ALWAYS_VALIDATE"  from 1 to 0 enabled LAS to read DODS.  Try that and check if the las/servre/dods/.dods_cache directory is being written to as requests are made to the LAS server.

Joe
------------------------

Cyndy Chandler wrote:

Hi all,

I'm having trouble with a new LAS 6.2.1 install on a linux RH9 system:
It seems I am unable to access DODS served data from LAS 6.2.1.
I hoping someone out there has a suggestion for why LAS might not be able to access a DODS dataset.

Details of my situation:

Instead of the requested plot, the following is displayed in the browser window

yes? go std_initialize "http://usjgofs.whoi.edu/dods-bin/nph-dods/dods/data/fer_dsets/data/coads_climatology.cdf" "1" "1" "airt"
 ** netCDF error: Invalid Argument
        is this a CDF file ?

but I am able to access the data directly from ferret using the same command, and also via a DODS URL as well.

I've done lots of testing and have narrowed this down to an inability of LAS 6.2.1 to access data via DODS.

I am suspicious that something on the linux system has gotten clobbered somehow, since when I regenerate the server/UI, the following lines are returned:
../xml/perl/genLas.pl -h usjgofs2.whoi.edu -u root -p PSWD las.xml
Serializing file:/usr/local/las-lite/server/las.xml to database
Building indexes...
Resolving links...
Generating dataset COADS climatology
Generating dataset Levitus Climatology

notice the absence of  "ExternEnt (XML::Parser::Expat="  type lines.

as opposed to those I  receive when generating the analogous server on a different system (an SGI):
../xml/perl/genLas.pl -h usjgofs.whoi.edu -u root -p PSWD las.xml
ExternEnt (XML::Parser::Expat=HASH(0x10383ebc),las.xml,operations.xml)
ExternEnt (XML::Parser::Expat=HASH(0x10383ebc),las.xml,coads.xml)
ExternEnt (XML::Parser::Expat=HASH(0x10383ebc),las.xml,levitus.xml)
Serializing file:/users/las/las-lite/server/las.xml to database
Building indexes...
Resolving links...
ExternEnt (XML::Parser::Expat=HASH(0x108e94b8),ui.xml,options.xml)
Generating dataset COADS climatology
Generating dataset Levitus Climatology

perhaps it's just a difference in the two OS (SGI IRIX v. RH9)?
but I include it here in case this observation is related to my LAS/DODS problem.

I have two LAS6.2.1 servers set up, both configured with the default las.xml (COADS and Levitus only) and none of my customizations (hence the las-lite names).

The one that works is running on an SGI/IRIX system (that is old and tired):
http://usjgofs.whoi.edu:8060/las-lite/servlets/

and the one that can not see any DODS datasets is (a new RH9 - superfast, but DODS-challenged!):
http://usjgofs2.whoi.edu:8060/las-lite/servlets/

On each one, I set up the xml files so that COADS is served via DODS 3.2 running on the SGI
(since DODS 3.4 on the RH9 system is new and may have issues of it's own)

OS environment details follow in case that's helpful.

Thanks for any hints anyone can provide,
Cyndy

linux RH9 environment details:
Linux RedHat 9.0 2.4.24 #11 SMP
DODS server core software: DAP/3.4.5    <-- on RH9 system
(but the DODS server being used is v3.2)    <-- on SGI/IRIX system
Apache/2.0.40 (Red Hat Linux)
gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
perl, v5.8.0 built for i386-linux-thread-multi
netcdf library version 3.5.0 of Oct 10 2003 13:42:35
FERRET v5.53 - Linux(g77) 2.4.20 - 10/16/03
mysql  Ver 11.18 Distrib 3.23.58, for redhat-linux-gnu (i386)
Bit::Vector 6.1
CGI 2.89
Compress::Zlib 1.33
DBD::mysql 2.1021
DBI 1.32
Data::ShowTable (unknown)
Date::Calc 5.3
Date::Manip 5.40
Digest::MD5 2.20
File::PathConvert 0.9
HTML::Parser 3.26
HTML::Tagset 3.03
LWP::UserAgent 2.001
Log::Agent 0.305
MD5 2.03
MIME::Base64 2.12
NetCDF (unknown)
Parse::Lex (unknown)
Parse::Yapp (unknown)
Template 2.12
Test::More 0.47
Time::HiRes 1.38
URI::URL 5.03
XML::DOM 1.27
XML::Parser 2.31
XML::Parser::PerlSAX 0.07
XML::RegExp (unknown)
 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Cyndy Chandler                  | voice: (508) 289-2765
MS #43, WHOI                    | Office hrs: M-F ~ 9-4
Woods Hole, MA  02543   | FAX: (508) 457-2161
cchandler@whoi.edu              | FAX2: (508) 457-2164
U.S. JGOFS Data Management Office
Department of Marine Chemistry and Geochemistry
Woods Hole Oceanographic Institution