Re: [thredds] over written file has old global attributes

  • Subject: Re: [thredds] over written file has old global attributes
  • From: John Caron <caron@xxxxxxxxxxxxxxxx>
  • Date: Tue, 06 Nov 2007 09:40:58 -0700
The other possibility is caching in your browser. It can be tricky to be absolutely sure 
you are getting a fresh copy. I like using the "Live HTTP Headers" plugin for 
firefox. But perhaps Shift-Refresh might work also. An independent test is the ToolsUI 
application, which never caches:

If you still see the problem, then it is caching on the server. It occurs to me that 
"overwriting the file" may be the problem. You should be writing a new file, 
and deleting the old. What exactly are you doing?

Roy Mendelssohn wrote:
Hi jean: '

My guess is you are getting the cached information, which hasn't been updated. You can set the frequency of update in the catalog xml file. Also, usually if you touch the file (i.e. do something that causes to Thredds to access the data( that usually also updates the info.

-Roy M.

On Nov 5, 2007, at 4:51 PM, Jean.C.Newman@xxxxxxxx wrote:

I have a set of netcdf files that are being accessed via OpenDAP and are regularly overwritten. Most of the files, 29 sets of 31, update correctly
but in 2 file sets the "Global Attributes" don't update to the new
information although the "data" does. "ncdump -h" shows the correct
information, :history = "MOST v2.080 11-05-2007  16:09:22" ;
              :title = "Aleutian-Cascadia: Mwt 8.4, 21.00*b65" ;
  in the headers but when I look at it in a browser,
I see the old file attributes,
history: "MOST v2.080 11-05-2007  11:49:33"
title: "Aleutian-Cascadia: Mwt 8.5, 29.00*b25".
If I restart tomcat then the correct information shows up.
I'm new at thredds so I may very well be doing something stupid but I
could find no information. Below is the change I made to
$tomcat_home/content/thredds/catalog.xml. Any suggestion?
Thank you, Jean
<service name="ncdods" serviceType="OpenDAP" base="/thredds/dodsC/" />
   <datasetScan name="MOST tsunami model data" ID="mostDatasetScan"
path="sims" location="/home/tg15/data/sims" serviceName="ncdods">
     <metadata inherited="true">
       <include wildcard="*.nc"/>
       <lexigraphicByName increasing="true" />
   Jean Newman                             Tel: 206-526-6531
   NOAA Center for Tsunami Research
   NOAA/PMEL/OERD2 - UW/JISAO              FAX: 206-526-6485
   7600 Sand Point Way NE, Bldg. 3    jean.c.newman@xxxxxxxx
   Seattle, WA 98115-6349               jcn@xxxxxxxxxxxxxxxx
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Roy Mendelssohn
Supervisory Operations Research Analyst
Environmental Research Division 
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097

e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
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