On Oct 24, 2009, at 8:18 AM, John Caron wrote:
Peter Cornillon wrote:
Hi Rich,
I was at a NASA meeting this week in which we were discussing
metrics for NASA related projects. As a result of the discussion,
we decided to experiment with a metrics group at Goddard. What I
want to do is to develop a general evaluation of http logs from
OPeNDAP enabled servers. The idea would be to generate a consistent
set of stats from these servers. The job of sorting out stats can
be divided into two parts, one part that is OPeNDAP specific - how
many das, dds,... accesses, how many data accesses, what the volume
of the data access was,... The second part is provider specific,
what constitutes a dataset at that site. We will be experimenting
with a Hyrax and a GDS server, but I'm assuming that much of the
OPeNDAP specific info would be the same for a TDS. In addition to
these one would probably want to know how many WCS accesses or
other accesses were made for a TDS. Assuming that we make good
progress on the servers that we will be messing around with, it
might make sense to extend the project in the not too distant
future to TDS. Comments?
Peter
Hi Peter:
That would be very welcome.
The TDS uses standard apache log format, but we also advise to
append the amount of (wall clock) time it took to process the
request. Its up to the individual user to do this, however. Im not
sure what Hyrax/GDS uses as a log format.
The TDS uses a very regular URL naming schema that makes it
straightforward to figure out the service used. extracting the
dataset name is slightly more complicated. I can send some code
snippets if anyone is interested.
I am sure that this will be of interest when/if we get to that point.
My guess is that it will take a month or so to work out an approach
based on the Hyrax and GDS logs. Once we have done that, assuming that
Goddard is interested in pursuing this on a larger scale, we can look
at TDS logs. If Goddard is not interested in pursuing this for the
community at large, it may be worth seeking funding to do so. I think
that this would provide a very interesting data set with which to
explore use of the DAP. Thanks for your interest John.
Peter
--
Peter Cornillon
215 South Ferry Road Telephone:
(401) 874-6283
Graduate School of Oceanography Fax:
(401) 874-6283
University of Rhode Island
Internet: pcornillon@xxxxxxxxxxx
Narragansett, RI 02882 USA
