Hi Roland-
On 5/7/12 8:42 AM, Roland Schweitzer wrote:
An obvious test case would be a copy of a file before the update happens
and a copy of the same file just after the update happens. With those
two files John's group could simulate the update easily. :-)
I can save those off for today. However, for these aggregations, even
though we are in May, the last dates for 2012 that show up in the
aggregations are from January and February - even with tomcat restarts.
There is no rhyme nor reason that we can find on what dates show up
for each aggregation.
I'll wait to hear from Unidata on what information they need or if they
want to come visit. Thanks to the community for pushing for a
resolution to this issue.
Don
On Sun, May 6, 2012 at 10:04 AM, Don Murray <don.murray@xxxxxxxx
<mailto:don.murray@xxxxxxxx>> wrote:
John-
On 5/5/12 4:56 PM, John Caron wrote:
We have someone working on trying to reproduce this problem. If
we can
reproduce it, we can fix it. Any help doing that would be
appreciated.
Since I'm the one who updates the dataset, here's what happens. The
SST datasets consist of yearly files which we are trying to
aggregate into one dataset. The latest file (or files depending if
we are crossing a year boundary) is updated on a daily basis and the
last 14 days of data are overwritten and a new timestep (day) is
added. We do more than just add a timestep because the last 14 days
of data are preliminary and subject to updates. The file(s) being
updated are then synced out to the filesystem that TDS looks at.
Hoop has said he would provide any catalog/configuration information
you require. If it would speed up the process, perhaps someone from
Unidata could drive across town and visit NOAA.
Don
On 5/4/2012 5:41 PM, Roy Mendelssohn wrote:
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
<mailto:Roy.Mendelssohn@xxxxxxxx> (Note new e-mail address)
voice: (831)-648-9029 <tel:%28831%29-648-9029>
fax: (831)-648-8440 <tel:%28831%29-648-8440>
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.
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