On Mon, Jul 24, 2017 at 4:55 PM, Bartek Burkot <pomiarowie...@poczta.onet.pl
> wrote:
> Thanks Edward for your feedback really appreciate
>
> Maybe I was not clearly mentioning the problem but I'm going to register 2
> million layers in geoserver and access it via getmap WMS method one by one.
> Not all at once in one request.
>
You can still access them one by one, by adding a CQL_FILTER hitting the
mosaic index (assuming you harvested an attribute allowing you to tell them
apart, it might be even be the file name
which is already there).
> I experienced the troubles with long start up time of Tomcat service if
> there is many configured layers in it. In extreme case the startup time was
> several hours. That's why I mentioned the jdbcConfig plugin which stores
> the configuration of layers in DB instead in local filesystem. With
> jdbcConfig the startup time is about several seconds instead of several
> hours.
>
Because it's not loading the catalog on startup, but querying things on
demand (and making tens of queries to the database per request).
Which, with 2 million layers, may be a quite significant overhead... when
working on the ticket you mentioned
I noticed jdbcconfig was adding 80ms overhead on all requests compared to a
catalog in memory, with a catalog of 10k layers stored in a local
postgresql database.
With 2 millions, even considering a logarithmic growth of the overhead,
assuming everything jdbcconfig queries is indexed, you might still be
looking at 1s ovehead per request (only actually trying will tell you the
exact extra time, mine is just a guess).
> Has anybody of you experience by adding a huge number of layers to
> geoserver?
>
The normal approach is to avoid setting them up, and perform some filtering
on a single layer instead.
It also makes sense, since with a million layers the normal WMS protocol,
starting with capabilities,
becomes 100% unusable, so you definitely have some other way to know which
item you want
to pick out of the 2 millions.
Cheers
Andrea
--
Regards,
Andrea Aime
==
GeoServer Professional Services from the experts! Visit http://goo.gl/it488V
for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
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phone: +39 0584 962313
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