Hi Kyle:
I think this is a problem for large installations; the TDS has to read
through the "static catalogs" at startup to find all of the data roots.
We have tried to minimize the use of static catalogs by using
dynamically generated catalogs (datasetScan), which generates them on
the fly. Aggregations can also be dynamic by using the scan element.
I wonder if these are possible solutions for you? If not, can you
characterize what you are doing, so we can understand what you need? We
are looking at ways to make the "large number of static catalogs" use
case more efficient, but havent started working on it yet.
For your specific question, obviously the issue is the object caching
inside the TDS, and since restarting the TDS clears everything, that
works. However thats a pretty big price to pay. Reinit should work, but
probably you have found a bug. I probably have to recreate it here to
understand more details. But even reinit is really too blunt.
Anyway, can you describe how often and what changes, and send a sample
catalog?
thanks,
John
On 2/18/2011 11:35 AM, Kyle Wilcox wrote:
Hi all -
I'm looking for some best practices for reloading the THREDDS catalog.
How do large TDS implementation deal with a changing catalog? Do you reload
the entire THREDDS application to pick up changes? Are there just not that
many catalog changes, so a restart is not a big deal?
Does the THREDDS application always need to be reloaded in some way if the
catalog is updated? I'm trying to get away from having to reload large
aggregations every time the catalog is changed.
For example: When change an attribute value via NcML, the OPeNDAP form does
not update with the changes automatically.
* Using the "Reinitialize" link on the admin panel DOES NOT refresh the form
(even after clearing browser cache)
* Using the links on the admin panel to clear various caches DOES NOT refresh
the form.
* Using the "Disable Caches" link on the admin panel and then clicking
"Reinitialize" DOES refresh the dataset. Something tells me this is not what I should be
doing.
* Restarting Tomcat DOES reset the dataset
* Using 'touch $CATALINA_HOME/webapps/thredds/WEB-INF/web.xml' DOES refresh the dataset.
This is the same as using the "Reload" link on the Tomcat Manager.
---------
Kyle Wilcox, Engineer
Applied Science Associates
55 Village Square Drive
South Kingstown, RI 02879
p: (401) 789-6224
e: kwilcox@xxxxxxxxxxxxxx
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