Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Hi David:Im guessing that you have caching disabled, or is ineffective for some reason. Can you send me your threddsConfig.xml file to verify that ? If thats true, is that deliberate?
Under those circumstances, any access to an aggregation has to rebuild the aggregation, no matter what the recheckEvery setting is. TDS 4.1 now has a file system cache using ehcache, which will only do an OS file scan when the directory changes.
So bottom line is, re-enable the NetcdfFile object cache and things should work as expected. If thats not the case then we have more investigating to do.
David Robertson wrote:
Hi, Richard Signell wrote:I'm pretty sure the caching behavior has changed a lot with different versions of the THREDDS Data Server -- and I'm pretty sure the latest 4.1 server does not rescan the entire aggregation. What version are you using?TDS 4.1 built on October 10th. I'm not positive that it's rescanning the entire directory but it definitely takes longer (10-60 seconds versus ~1 second) just after I touch a file in the directory. This current test was using recheckEvery="-1" but the results are the same without recheckEvery and with it set to a normal value like "15 min".As long as nothing in the directory has a new date, I can access the dataset in ~1 second even hours later.Dave-Rich On Fri, Oct 23, 2009 at 12:27 PM, David Robertson <robertson@xxxxxxxxxxxxxxxxxx> wrote:Hi all,It seems that THREDDS forces a rescan if the time stamp on the directory has changed. Even if I set recheckEvery to -1 or 90 days it still appears to rescan when the modified date on the folder changes. I tested this using asimple "touch junk" command in the directory I'm aggregating.This makes sense so that files added to the directory can be added to the aggregation. However, is there a way to tell TDS to skip this step for a given dataset or will I need to put my non-changing datasets in subfolders? If I put them in subfolders will I be able to aggregate the entire datasettogether anymore? Perhaps something like: <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> <aggregation dimName="time" type="joinExisting"> <scan location="/home/om/dods-data/thredds/cool/avhrr/nc4/2006/" regExp="^2006.*\.nc" /> </aggregation> </netcdf> for each year and <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> <aggregation dimName="time" type="joinExisting"> <scan location="/home/om/dods-data/thredds/cool/avhrr/nc4/" regExp=".*/*\.nc" /> </aggregation> </netcdf> to get the aggregation to go through the subfolders and put the years together?The solution of getting TDS to skip rescan on specific datasets would bepreferable to simplify scripts and avoid having to change them each new year. Thanks, Dave Roy Mendelssohn wrote:I believe if you don't set rescan it uses the default value - but would have to check on that. I know there is a way to tell it to not rescan.-Roy On Oct 22, 2009, at 9:42 AM, David Robertson wrote:Hi, Roy Mendelssohn wrote:What is your rescan set to for that dataset? That is probably what isI am not using rescan or recheckEvery so that's probably the problem thecausing it.dataset element I'm using is pasted below: <dataset name="2006" ID="cool-avhrr-bigbight-2006" urlPath="cool/avhrr/bigbight/2006" > <metadata inherited="true"> <timeCoverage> <start>2006-01-01 03:10:00 UTC</start> <end>2006-12-31 22:53:00 UTC</end> </timeCoverage> <geospatialCoverage> <northsouth> <start>34.9950981140137</start> <size> 11.0090637207031</size> <units>degrees_north</units> </northsouth> <eastwest> <start>-77.0059967041016</start> <size> 14.0119972229004</size> <units>degrees_east</units> </eastwest> </geospatialCoverage> </metadata><netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";><aggregation dimName="time" type="joinExisting"> <scan location="/home/om/dods-data/thredds/cool/avhrr/nc4/" regExp="^2006.*\.nc" /> </aggregation> </netcdf> </dataset><!--2006-->On Oct 22, 2009, at 8:47 AM, David Robertson wrote:Hi,Is there a way to tell the TDS NOT to look for new files to add to an aggregated dataset? I have several aggregations set up that do not change (no added or removed or modified files). Yesterday after generating the aggregation cache, access the dataset was quite quick; ~1 second to load the Data Access Form. However, when I try to access those same datasets today it takes just as long as it did to generate the aggregation cache in the firstplace (5 minutes).It should be noted that these aggregations are subsets of files in a directory that IS being updated. What I have done used a regExp to separate a very large dataset into years. The 2008 and prior aggregations will not have files added so I'm looking for a way to stop the TDS from searching fornew files to add to the aggregation cache. Thanks, Dave _______________________________________________ thredds mailing list thredds@xxxxxxxxxxxxxxxx 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@xxxxxxxx (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." "From those who have been given much, much will be expected"********************** "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@xxxxxxxx (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." "From those who have been given much, much will be expected"_______________________________________________ thredds mailing list thredds@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/_______________________________________________ thredds mailing list thredds@xxxxxxxxxxxxxxxxFor list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
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