On Tue, Jan 22, 2013 at 6:53 AM, Geoff Williams <[email protected]>wrote:
> Hi List,
>
> I'm running a geoserver instance with a 10K max feature limit. A
> colleague of mine is interested in obtaining feature counts for a
> datasource containing 30K+ features.
>
> He can find this information by making multiple requests with
> resultType=hits and using the built-in geoserver paging but it would be a
> lot nicer if he could just make one request and get an accurate count with
> the server ignoring the configured maximum feature limit for the purposes
> of an accurate feature count.
>
I see. The limit is working on count too for good reasons:
- counting can be expensive (can take minutes) if you have datasets with
tens or hundreds of millions of records
- the filter expressed in the WFS request can make it much worse, for
example, you might filter on an
attribute that's not indexed, or use WFS 2.0 to ask for an expensive join
> Is this something that's easy to change? Would there be any interest in a
> patch to allow this?
>
I believe it could be of interest, but it would have to be configurable,
either a separate max value
for the count operation or a flag disabling the existing max for the count
operation.
The classes to be modified would be WFSInfo, WFSInfoImpl (the configuration
bits), the WFSAdminPage,
and the GetFeature class to take into account the above configurations.
Since this is an API change, it has to take place on the unstable series
before (which, starting
from today, means the 2.4.x series, the 2.3.x series is entering hardening
today in preparation
for the 2.3.0 release in a couple of months).
If you want to persue this please discuss the changes you want to make on
the geoserver-devel
list.
Cheers
Andrea
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