problem with THREDDS server 4.0 beta
Denis Nadeau
dnadeau at pop600.gsfc.nasa.gov
Fri Feb 2 10:51:04 PST 2007
This is working fine now.
Thanks everybody
Denis
Denis Nadeau wrote:
> No I did not restart the webapp since I made the change. I thought that
> the catalog was read on-the-fly when changed.
>
> As well, last time I restarted the webapp I got a problem with the BES
> connection that stayed openned and I had to restart Jakarta-Tomcat server.
> Should kill the BES before restarting the webapp?
>
> Denis
>
> Ethan Davis wrote:
>
>> Hi Denis,
>>
>> Hmm, this may not be a caching problem.
>>
>> Have you stopped and then started the opendap webapp since you made
>> the changes? If not, I suspect you need to do that before the changes
>> will show up.
>>
>> Nathan, do you provide a way to reinitialize the THREDDS configuration
>> without restarting the webapp? DataRootHandler has a reinit() method
>> which will do just that. The trick is providing a way for the server
>> administrator to access it.
>>
>> Ethan
>>
>> Denis Nadeau wrote:
>>
>>> Hi Ethan,
>>>
>>> My cache size is set at 0Mb in my browser. I delete the cache each time
>>> I quit the browser.
>>> I tried with 2 different browsers as well.
>>>
>>> I am accessing this directory:
>>> http://mymachine:myport/opendap/s4/catalog.html
>>> I have changed the catalog.xml datascan TAG to this:
>>> <datasetScan location="/root/data" path="data" name="SVN223233 Test
>>> Data Archive" serviceName="OPeNDAP-Server4">
>>>
>>> My browser still display this:
>>> SVN Test Data Archive
>>>
>>> The only place I can see "SVN Test Data Archive" now is in :
>>> webapps/opendap/initialContent/catalog.xml
>>>
>>>
>>> Denis
>>>
>>> Ethan Davis wrote:
>>>
>>>
>>>> Hi Denis,
>>>>
>>>> The problem is with client-side caching rather than server-side. In a
>>>> browser like Firefox, you can force a page to reload by hitting the
>>>> reload button while holding down the shift key. I'm not sure about
>>>> other browsers but they probably have something similar. Or you can
>>>> empty the entire cache.
>>>>
>>>> Nathan's fix will mean the pages won't get cached so you'll see your
>>>> changes without the above. In the longer term, we'll also be working
>>>> on getting better cache information into the HTTP headers.
>>>>
>>>> Ethan
>>>>
>>>> Denis Nadeau wrote:
>>>>
>>>>
>>>>> Nathan,
>>>>>
>>>>> Thanks for you quick answer.
>>>>> If I delete the file in the cache file, I guess it would reread my
>>>>> catalog.xml. Could you tell me what directory this file is cached?
>>>>> Is it this one:
>>>>> work/Catalina/localhost/opendap
>>>>>
>>>>> Regards,
>>>>> Denis
>>>>>
>>>>> Nathan Potter wrote:
>>>>>
>>>>>
>>>>>
>>>>>> Dennis,
>>>>>>
>>>>>> Um... I suspect James' answer isn't addressing your problem. It is
>>>>>> likely that the problem is probably with caching. Ethan Davis alerted
>>>>>> me to it this week, and I have patched the Server4 code. Essentially
>>>>>> the THREDDS responses are getting cached by your client and
>>>>>> Server4 is
>>>>>> erroneously reporting that the last modified date is remaining
>>>>>> unchanged despite your alterations to the catalog files.
>>>>>>
>>>>>> We hope to have another beta release this week that will patch that
>>>>>> and the problem you reported earlier regarding Tomcat hanging after a
>>>>>> BES crash.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Nathan
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Jan 31, 2007, at 3:34 PM, James Gallagher wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>> On Jan 31, 2007, at 4:01 PM, Denis Nadeau wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> I have tried to play with the THREDDS catalog under
>>>>>>>> content/opendap/cataolog.xml to add new datasets.
>>>>>>>> It seems that the file is not read at all by opendap server 4.
>>>>>>>> When
>>>>>>>> I click on the "HTML" link, I can't get my catalog.xml to be
>>>>>>>> parsed
>>>>>>>> at all.
>>>>>>>>
>>>>>>>> Can anybody reproduce this?
>>>>>>>>
>>>>>>>> As well, can you explain to me what this variable is used for (in
>>>>>>>> the BES.conf)?
>>>>>>>> BES.Catalog.catalog.RootDirectory
>>>>>>>>
>>>>>>>>
>>>>>>> Dennis,
>>>>>>>
>>>>>>> The parameter BES.Catalog.catalog.RootDirectory is the root
>>>>>>> directory
>>>>>>> of your data if your using THREDDS catalogs. The other
>>>>>>> 'RootDirectory' parameter is used by sites which don't support
>>>>>>> THREDDS (because the BES is used by the Earth System Grid project as
>>>>>>> well, without the OLFS component). It's confusing, I know. I have a
>>>>>>> ticket to make the comments in the default bes.conf file a little
>>>>>>> more informative.
>>>>>>>
>>>>>>> Try this: Set your BES.Catalog.catalog.RootDirectory to the root of
>>>>>>> your data and ignore the value of the other parameter (I believe it
>>>>>>> has to have a value, but you can set it to /dev/null if you want)
>>>>>>> and
>>>>>>> then see if your catalogs work. If not this maybe a question for
>>>>>>> Nathan, the THRESS guru here.
>>>>>>>
>>>>>>> James
>>>>>>>
>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Denis
>>>>>>>>
>>>>>>>> --Denis Nadeau
>>>>>>>> Goddard Earth Sciences Data & Information Services Center
>>>>>>>> Code 610.2
>>>>>>>> NASA Goddard Space Flight Center, Greenbelt, MD 20771
>>>>>>>> Phone: (301) 614-5514
>>>>>>>> Fax: (301) 614-5268
>>>>>>>> email: dnadeau at pop600.gsfc.nasa.gov
>>>>>>>> http://disc.gsfc.nasa.gov
>>>>>>>> http://giovanni.gsfc.nasa.gov
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>> --
>>>>>>> James Gallagher jgallagher at opendap.org
>>>>>>> OPeNDAP, Inc 406.723.8663
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>> =
>>>>>> Nathan Potter ndp at opendap.org
>>>>>> OPeNDAP, Inc. 541.752.1852
>>>>>>
>>>>>>
>>>>>>
>>>>>> The OPeNDAP Developer's Meeting will be held on
>>>>>> 21-23 Feb 2007 in Boulder CO.
>>>>>>
>>>>>> See the Developer's Wiki:
>>>>>> "http://wiki.opendap.org/twiki/bin/view/Developers/DevMeeting2007"
>>>>>> for more details.
>>>>>>
>>>>>> =
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>
>>>
>
>
>
--
Denis Nadeau
Goddard Earth Sciences Data & Information Services Center
Code 610.2
NASA Goddard Space Flight Center, Greenbelt, MD 20771
Phone: (301) 614-5514
Fax: (301) 614-5268
email: dnadeau at pop600.gsfc.nasa.gov
http://disc.gsfc.nasa.gov
http://giovanni.gsfc.nasa.gov
More information about the Opendap-tech
mailing list