On 1/18/2012 8:11 AM, Doug Lindholm wrote:
Hi,
I have a custom IOSP that I am trying to use to aggregate datasets. It
works when I use the "location" attribute with local files, but my
IOSP can also read data via URLs, bypassing the "location" (which I
set to /dev/null) and loading my data (e.g. from an ftp URL) into a
Variable cache.
I have a trivial example of trying to use joinExisting with two files
with two variables: time and value. In the end, the result
successfully aggregates the values, but the times from the first file
are repeated for the second half of the aggregation.
My first point of confusion is that open gets called on my IOSP THREE
times. (If I don't call "initNetcdfFileCache" it calls open 9 times.)
It appears to be random whether the first call reads the first or
second file, then the same file gets read again. However, even the
working test with "location" also has the third read. That redundant
read seems indicative of bigger problems.
Somewhere in the ~20 hops between my read and the IOSP getting invoked
(AggregationExisting.buildNetcdfDataset), I see something about a
"typical dataset". That seems to be the source of the extra read, and
where I gave up so my head wouldn't explode. But I am no closer to
understanding the incorrect time values.
Am I barking up the right tree? Should I expect my custom IOSP to work
with aggregation?
Thanks,
Doug
P.S. I'm using 4.2.
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Hi Doug:
I cant think of any reason why a custom IOSP wouldnt work. OTOH,
Aggregation is old and crufty so its possible you are seeing a bug. Im
in the slow process of refactoring it.
Each open would probably be followed by a close - are you seeing
something else?
Can you make up a sample program that illustrates the problem?
John
