Varnish is a reverse proxy cache: https://varnish-cache.org/docs/trunk/tutorial/introduction.html
On Fri, 22 Nov 2019 at 01.33, Amandeep Srivastava < amandeep.srivastava1...@gmail.com> wrote: > Thanks Andy, ajs6f > > I wanted to use the soft links because I'll be updating my database once > every month. Whenever I have a new database, I'll overwrite inactive > database and point the softlink to it making it active and the current one > inactive (stale) without bringing down fuseki and losing any requests. Next > time I would overwrite second database and switch back to it. But seems, > that won't work because of caching. > > Can you please elaborate how to do it using reverse proxy? > > > On Thu, 21 Nov, 2019, 11:08 PM Andy Seaborne, <a...@apache.org> wrote: > > > > > > > On 21/11/2019 17:16, ajs6f wrote: > > > Why wouldn't you just load these as two separate datasets available at > > different endpoints in one instance of Fuseki? Why try to fool Fuseki > into > > thinking that two datasets are really one? > > > > Agreed. > > > > > > > > ajs6f > > > > > >> On Nov 21, 2019, at 6:57 AM, Amandeep Srivastava < > > amandeep.srivastava1...@gmail.com> wrote: > > >> > > >> Hi, > > >> > > >> Is there any resource that talks about caching in Fuseki service? > > >> > > >> Is is handled by Fuseki server itself or the TDB? (I'm using tdb > > dataset in > > >> the backend as input) And can we disable the cache? > > >> > > >> My use case is to query two dumps, one old and one new and I'm setting > > - - > > >> loc to a soft link pointing to the new dump while running fuseki. > > > > In effect, symbolic links are resolved at he start and never checked > again. > > > > >> At times, > > >> I wish to point my soft link to the older dump and query that. I don't > > want > > >> to run another instance of the server. > > >> > > >> By understanding caching, I just want to make sure that when I point > my > > >> soft link to new location, fuseki service doesn't use its older cache > to > > >> answer incoming queries. > > > > You can't manipulate the file system going underneath Fuseki or TDB. > > Mostly, likely it simply won't notice (the file are already open) but it > > may be worse. > > > > If you want to swap datasets in-place you'll need to stop and restart > > Fuseki. > > > > One different way is to use a reverse proxy (httpd for example) and have > > two Fuseki servers. Switchover in the reverse proxy - they usually > > reload configs while running, preserving oustanding requests. > > > > Andy > > > > > > > > >> > > >> Thanks, > > >> Aman > > > > > >
