[thredds] over written file has old global attributes
Jean.C.Newman at noaa.gov
Jean.C.Newman at noaa.gov
Tue Nov 6 11:42:58 MST 2007
One other thing, the "old attributes" lasts. I made a run yesterday at
11:23 am and it was over written several time the last at 16:09 and today
if I look at that output file via LAS/"dncdump -h" it still shows the "old
stuff" from the 11:23 run. "ncdump -h crescent_runup_ha.nc" has the
correct 16:09 information. Thanks, Jean
___________________________________________________________
Jean Newman Tel: 206-526-6531
On Tue, 6 Nov 2007, Jean.C.Newman at noaa.gov wrote:
> The question:
> Is there some way to turn off caching of metadata so the file is checked
> every time it's accessed? Jean
> ___________________________________________________________
> 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 at noaa.gov
> Seattle, WA 98115-6349 jcn at u.washington.edu
> _________________________. URL: http://nctr.pmel.noaa.gov/
> (__________________________________
>
> On Tue, 6 Nov 2007, Jean.C.Newman at noaa.gov wrote:
>
>> It's not a browser caching problem. I have a very old LAS that accesses
>> these files. From the LAS, input for a model run is set up then a servlet
>> is run on 1 of several possible machines that starts a FORTRAN model run
>> that overwwites files so that the LAS interface has static files/"DODs"
>> URLs for the output. We are moving to different code but need to keep this
>> working until the new is up and reliable. The data updates, I can see
>> that in the plots, but I use global attributes in labeling and I get the
>> old information sometimes, 2 out of 31 SIM runs. The example I put out on
>> the sift machine was run on an internal machine and then sftp-ed to sift.
>> Then I made another run and again sftp-ed it to the sift machine and saw
>> the same "old attributes" problem, which I really didn't think I would.
>> If tomcat is restarted then I get the new information so I imagine it is
>> some caching problem. I did try removing the file before rerunning the
>> SIM and that did not solve the problem. Is there some way to turn off
>> caching of metadata so the file is checked every time it's accessed? Jean
>> ___________________________________________________________
>> Jean Newman Tel: 206-526-6531
>>
>> On Tue, 6 Nov 2007, John Caron wrote:
>>
>>> 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:
>>>
>>>
>> http://www.unidata.ucar.edu/software/netcdf-java/v2.2/webstart-dev/index.html
>>>
>>> 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 at noaa.gov 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,
>>>>> http://sift.pmel.noaa.gov/thredds/dodsC/data/crescent_runup_ha.nc.html
>>>>> 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">
>>>>> <serviceName>ncdods</serviceName>
>>>>> </metadata>
>>>>> <filter>
>>>>> <include wildcard="*.nc"/>
>>>>> </filter>
>>>>> <sort>
>>>>> <lexigraphicByName increasing="true" />
>>>>> </sort>
>>>>> </datasetScan>
>>>>> ___________________________________________________________
>>>>> Jean Newman Tel: 206-526-6531
>>>>> _______________________________________________
>>>>> thredds mailing list
>>>>> thredds at unidata.ucar.edu
>>>>> For list information or to unsubscribe, visit: http://
>>>>> www.unidata.ucar.edu/mailing_lists/
>>>>
>>>> **********************
>>>> "The contents of this message do not reflect any position of the U.S.
>>>> Government or NOAA."
>>>> **********************
>>>> Roy Mendelssohn
>>>> Supervisory Operations Research Analyst
>>>> NOAA/NMFS
>>>> Environmental Research Division
>>>> Southwest Fisheries Science Center
>>>> 1352 Lighthouse Avenue
>>>> Pacific Grove, CA 93950-2097
>>>>
>>>> e-mail: Roy.Mendelssohn at noaa.gov (Note new e-mail address)
>>>> voice: (831)-648-9029
>>>> fax: (831)-648-8440
>>>> www: http://www.pfeg.noaa.gov/
>>>>
>>>> "Old age and treachery will overcome youth and skill."
>>>>
>>>>
>>>>
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