Hi Fabian, On 2014-09-08 15:50, Fabian Cretton wrote: > A first thing is that it is not clearly stated, in my opinion, when the > LDCache is triggered. > > The only further information I found was here: > http://markmail.org/message/m3ft65du5kbuzy5z#query:+page:1+mid:j347sjyegwshvhc7+state:results > and thus I understood that the SPARQL interface don't interact with > LDCache, but the LDPath functionality does. > Is there anything else then running a LPath that would trigger the cache ? LDCache is triggered everytime a triple-pattern like "<uri> * *" is requested from the triple store. Then LDCache tries to load <uri> from remote.
LDPath is using such queries quite often, SPARQL only in few cases because many requests are directly issued to the database for performance. Even viewing the resource in the resource browser (http://wh55650:8080/marmotta/resource/*) should trigger LDCaching. > First of all, I see this error when launching Marmotta 3.2.1, could it > be related to my problems ? > INFO: Server startup in 11332 ms > 15:25:45.495 WARN - pattern > (C:\marmotta_inst\marmotta-home/resources|http://wh55650:8080/marmotta/resource/|urn:).* > is not a valid regular expression; disabling reader/writer filesystem > (message was Illegal/unsupported escape sequence near index 4 > (C:\marmotta_inst\marmotta-home/resources|http://wh55650:8080/marmotta/resource/|urn:).* > > ^) As the log says, it's only a warning and should not affect you unless you are storing (binary) content in Marmotta. Background and workaround for this issue was discussed on [email protected] [1] > My "ldcache.enabled" parameter is checked. > > I guess my problem is with setting up the end-point correctly. > > I first tried the provided sample "load sample -> dbpedia", which gives > in the interface: > kind: ld cache > Prefix: http://dbpedia\.org.* > Endpoint: http://dbpedia.org/sparql Looks like there is an error in the sample: Provider (kind) "ld cache" does not work with an SPARQL endpoint - for that you need to select "sparql" as kind. But as you noticed: since DBPedia provides valid Linked Data, no extra configuation is required - just request the resource and it will be fetched: <http://wh55650:8080/marmotta/resource/?uri=http://dbpedia.org/resource/Europe> > But a few things are already not clear for me: > * kind: ld cache > When referring to a sparql end-point, shouldn't the kind be "sparkl" ? > (I did try changing this, but with no success) > By the way, what is the meaning of the "cache" mode, I can't understand > from reading the explanation. Is it a server that servers "linked data" > ? if so, what is the difference with "linked data". > * prefix: > What are the "rules" to define those prefixes ? for instance I see in > the example that "." are escaped ? > Defining a prefix as "http://dbpedia\.org <http://dbpedia/.org>.*" will > thus mean that a URI as http://dbpedia.org/resource/Europe is bound to > that end-point, right ? > *endpoint: > The explanation says that for a SPARQL end-point, some parameters have > to be specified: > "http://sparql.sindice.com/sparql?default-graph-uri=&query={query}&format={contenttype}"; > Is this mandatory ? (as the provided sample don't specify them but just > specifies "http://dbpedia.org/sparql";), are there default values ? > *mimetype: > Not filled by the sample, are their default values depending on the > "mode of operation" ? > > If it is possible to get a few full examples of those settings, for the > different operation modes, it would be very helpful I guess. Sergio just now updated the documentation for the LDCache module [2], please have a look and check if anything is missing or unclear. Best, Jakob [1] http://mail-archives.apache.org/mod_mbox/marmotta-users/201409.mbox/%[email protected]%3E [2] http://marmotta.apache.org/platform/ldcache-module.html
signature.asc
Description: OpenPGP digital signature
