Hi All:
I have been corresponding with Hoop off list, because the datasets he is having
problems serving are important to NOAA, and getting them served properly is
important. His problem is:
>> On 05/02/2012 04:28 PM, Hoop wrote:
>>> All,
>>>
>>> This is my latest in a now monthly series of requests for help with
>>> doing aggregations with our TDS. The problem I first reported back
>>> on 23 February, wherein aggregations don't notice time steps added
>>> to the final file in the time series, is unresolved.. Since I last
>>> wrote (4 April), we upgraded to 4.2.10. There was no effect that we
>>> could discern. Whether we use NcML or FeatureCollection, new time
>>> steps in the final file go unnoticed until Tomcat is restarted.
>>> Fabulously, if a new file is added without restarting Tomcat, the
>>> initial time steps in the new final file are added to the aggregation,
>>> leaving a gap where the time steps added to the previous "final" file
>>> since the last Tomcat restart should be. This leads to complaints of
>>> the aggregation not being CF-compliant, since it appears to have
>>> uneven spacing in time.
>>>
>>> Interestingly, doing the aggregation in RAMADDA works as we would
>>> expect, since it is frequently rebuilding the aggregation. So, while
>>> it is perhaps less efficient than TDS, at least it is reliable.
>>>
>>> -Hoop
>>>
>>>>
I just checked with my group, and we have several aggregated datasets that work
this way. We have tons of datasets where each file is a new time period, and
they get updated just fine. But the ones where we are aggregating over files
with multiple time periods, and one of those files is being updated with new
data, the aggregation only gets updated by restarting tomcat. This has not
been a major issue because our datasets are updated monthly, so we do it once
and all is good. But if we were updating regularly, this would be a major
issue, as it appears to be for Hoop's group. Mainly I am writing for three
reasons:
1. This problem is not isolated to Hoop's group or how they are setup.
2. If anyone has this kind of aggregation updating successfully, can they
point to the URL, post the catalog.xml and threddsConfig.xml, and perhaps
sample files so we can test it and see what is different.
3. If successful examples can't be found that we can build on, is there anyway
this can elevated in importance at Unidata? I know there is a lot being worked
on, and priorities need to be set, but if a solution can't be found given the
present code base, it strikes me as a serious bug.
Thanks
-Roy
**********************
"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 arc of the moral universe is long, but it bends toward justice" -MLK Jr.
