On Fri, Dec 4, 2020 at 4:21 AM Jason Newmoyer <[email protected]> wrote:
> When the web user cancels a request to GeoServer OGC services, does the > PostGIS DataStore cancel the underlying postgres query? > There is no such mechanism... to the best of my knowledge, it cannot be implemented either, the servlet specification gives GeoServer no way to know a client has closed the connection, it can be determined only by writing out to the response... which, in a WMS request, can only happen when the map is fully painted, and starts getting encoded in an image format. One thing that is missing is dropping the query on timeout, respecting the WMS maximum render time. That could be implemented, inside JDBCStore (well, inside the JDBCFeatureReader) but not trivial either, requires setting up a separate set of threads that can issue the cancel without getting blocked on the first query execution call (for queries that take lots of time to return the first record) Cheers Andrea == GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054 Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339 8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it ------------------------------------------------------- *Con riferimento alla normativa sul trattamento dei dati personali (Reg. UE 2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si precisa che ogni circostanza inerente alla presente email (il suo contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra operazione è illecita. Le sarei comunque grato se potesse darmene notizia. This email is intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. We remind that - as provided by European Regulation 2016/679 “GDPR” - copying, dissemination or use of this e-mail or the information herein by anyone other than the intended recipient is prohibited. If you have received this email by mistake, please notify us immediately by telephone or e-mail.*
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