Re: Training offer for SPARQL

consulting company so if you would require a longer/bigger project involving more people I can contact you with them. Please let me know some more details if you are interested. My LI profile: https://www.linkedin.com/in/piotr-nowara-35040121/ Best, Piotr Nowara pt., 13 sty 2023 o 10:26 Luis Enrique

Re: Fuseki 4.* increased RAM consumption

in. > > Andy > > Unrelated inline: > > On 05/01/2022 11:49, Piotr Nowara wrote: > > Hi Andy, > > > > We are running Fuseki inside Kubernetes pod using our own Docker image on > > Ubuntu 20.04 and eclipse-temurin:11-jre-focal. > > > > The old

Re: Fuseki 4.* increased RAM consumption

aultGraph [ a ja:MemoryModel ; ja:content [ja:externalContent ] ; ] . <http://jena.apache.org/2016/tdb#DatasetTDB2> rdfs:subClassOf ja:RDFDataset . śr., 5 sty 2022 o 11:49 Andy Seaborne napisał(a): > Hi Piotr, > > Could you remind us what your setup is? > >

Fuseki 4.* increased RAM consumption

Hi, we've recently upgraded Fuseki from 3.13.1 to 4.3.1 because of log4shell. Our old Fuseki was super stable and reliable, but now after the upgrade we are getting Service Unavailable during normal load. I realized RAM consumption increased dramatically from 1-1.5GB (3.13.1) to more than 6GB

Log4Shell issue

Hi. I see the most recent Fuseki code on GitHub is using log4j 2.15. Do you know which older version might be affected? Thanks, Piotr

SHACL for referential integrity constraints

Hi, does anyone use SHACL for implementing integrity constraints in Jena/Fuseki graphs? My use case involves SQL-like checks like not letting delete a triple if its subject is referred somewhere else in the same graph. Or maybe you think it is much easier to implement it in pure SPARQL using ASK

Re: scaling jena

Hi! check RDF Delta: https://afs.github.io/rdf-delta/ Cheers, PN czw., 15 kwi 2021 o 09:24 reza sedighi napisał(a): > Hi, > > I want to use Jena for an enterprise scale company, so it should be > scalable in answering queries and also in storing data. Is that possible ? > > best regards >

Re: Fuseki v.17 seems not to work

fix works by exposing more operations. > > > > Has it been Chrome each time? > > > > It looks like it is problem originally from JENA-1638 but as to why > > 3.16.0 is OK and 3.17.0 is not, isn't clear to me. Between 3.16.0 > and

Re: Fuseki v.17 seems not to work

Hi Neli, I had a similar issue (not able to add/browse datasets on 3.17). I realized there must have been some change in the security layer related to shiro.ini file (which default form is being created in the /run subfolder when you first run Fuseki). To make it work you just need to make sure

Re: high availability

Hi, RDF Delta provides HA support via Zookeper https://afs.github.io/rdf-delta/ Cheers, Piotr czw., 21 sty 2021 o 10:29 Fang, Xiao Shan napisał(a): > Dear all, > > Does Jena TDB / TDB2 supports high availability? > > Thank you very much. > -xiaoshan >

Fuseki and Java 14

Hi, does anyone use Fuseki with Java 14? Any issues, performance improvements? Thanks, Piotr

Re: pellet Reasoner

) > at org.apache.jena.sys.JenaSystem.init(JenaSystem.java:114) > at org.apache.jena.rdf.model.ModelFactory.(ModelFactory.java:49) > at org.apache.jena.ontology.OntModelSpec.(OntModelSpec.java:49) > at ApacheProject.AppacheTest.main(AppacheTest.java:20) > > I will be glad to hear f

Re: pellet Reasoner

Hi Zeinab, try this refactored Pellet fork - it worked for me: https://github.com/Galigator/openllet Best, Piotr pon., 21 wrz 2020 o 11:45 Rezaeifar, Zeinab napisał(a): > Hi, > I am using apache jena 3.16.0 and I would like to use Pellet reasoner as > well. I found “ >

Re: Jena performance optimization

, Piotr pt., 11 wrz 2020 o 16:01 Andy Seaborne napisał(a): > > > On 10/09/2020 12:16, Piotr Nowara wrote: > > Dear Community, > > > > could you point me to resources on Jena performance optimization? > > > > I found this excellent presentation [1] covering a lo

Jena performance optimization

Dear Community, could you point me to resources on Jena performance optimization? I found this excellent presentation [1] covering a lot of interesting topics but I'm not sure how up-to-date it might be. I also read the Jena docs which gave me some hints but also created some confusion. My main

Re: RDF Delta/Zookeper freezing issue

e one outage and still allow write, or 2 > out and read-only. > > You can also configure zk in more complex primary-secondary configurations. > > A load balancer between the Fuseki servers and the zk servers may help. > > Andy > > > On 17/08/2020 17:09, Piotr Nowara wrot

Re: RDF Delta Zookeper on S3 issue

wants email about it here or not. > > Andy > > On 18/08/2020 13:29, Piotr Nowara wrote: > > No, we don't do anything extra to preserve the data. We expected RDF > Delta > > would pick it up automatically. Could you clarify what you mean by > > preserving? H

Re: shortcut for querying dates fast?

Hi, I'm wondering whether or not using xsd:long instead of xsd:dataTime with timestamps mapped to milliseconds in numerical form would not perform better. Best, Piotr pt., 28 sie 2020 o 13:15 Andy Seaborne napisał(a): > > > On 27/08/2020 09:10, Élie Roux wrote: > > Dear all, > > > > I have a

Re: RDF Delta Zookeper on S3 issue

hen redeploying? > > That keeps the patch index. It is not rebuilt from S3. > > Andy > > On 17/08/2020 17:05, Piotr Nowara wrote: > > Hi, > > > > We are using RDF Delta with the Zookeeper/S3 integration. The issue is > > after each redeploying of th

RDF Delta/Zookeper freezing issue

Hi, We are testing RDF Delta with three Zookeeper instances. Sometimes when we kill one of those Zookeper instances Fuseki freezes for about 30 seconds which is bad. Is this expected? Will increasing the number of Zookeper instances help to avoid such issues? Thanks, Piotr Nowara

RDF Delta Zookeper on S3 issue

make RDF Delta use the old files which are already in the expected place? Thanks, Piotr Nowara

Re: Fsueki RDF Delta

datasets. > > It does have (with "--stats") "/$/stats" which contains the dataset > information and more in a different way. > > Andy > > On 03/08/2020 13:15, Piotr Nowara wrote: > > Hi, > > > > I'm not able to issue any Admin Pro

Fsueki RDF Delta

Hi, I'm not able to issue any Admin Protocol endpoint call. I'm getting 404 each time. I need /$/ping and /$/datasets. Do I need to set up something special for them? I've tried with a standalone RDF Delta (configured as described in the tutorial) and also with the Zookeeper. Thanks, Piotr

Long URIs

Hi, does in your experience using very long URIs (like more than 100 characters) affect SPARQL performance? Thanks, Piotr

Re: jena-csv

gt; > ____ > From: Piotr Nowara > To: users@jena.apache.org > Sent: Monday, 14 January 2019 9:38 PM > Subject: jena-csv > > > > Hi, > > > I'm using jena-csv for importing CSV files to Jena. Now the 3.10 release > > notes say it's

jena-csv

Hi, I'm using jena-csv for importing CSV files to Jena. Now the 3.10 release notes say it's no longer a part of the release. What is the replacement for this retired module? Why it was retired? (I've read the linked JIRA and discussion but I couldn't find the reason) Thanks, Piotr

Re: Fuseki user-defined Web Services

/18 08:37, Piotr Nowara wrote: > > Hi, > > > > thanks for your comments. > > > > Andy, > > > > your link refers only to the embedded mode. How can I do something > similar > > for the standalone Fuseki server? > > > > You wrote "

Fuseki and changing passwords

Hi, changing a user's password requires restarting Fuseki (just like modifying anything else in shiro.ini file). This is really awkward for production environments where the users expect they can change their passwords on their own and whenever they want. How do you deal with it? Thanks, Piotr

Re: Fuseki user-defined Web Services

> >>> Adam > >>> > >>> On 2018/05/24 14:29:51, Martynas Jusevičius > >>> wrote: > >>> > >>>> I had long ago suggested that Jena should build on JAX-RS, which is > the > >>>> RESTful

How to restart Fuseki?

Hi, I'm using Fuseki standalone server on WIndows. I can easily start the server using fuseki-server.bat but I don't see a way to shutdown or restart a running Fuseki server, so I'm just killing it by closing the command line window which initiated the process. I hope there is a more civilized

Fuseki user-defined Web Services

Hi, is there any documentation describing the new Fuseki capability of handling the user-defined services? The 3.7.0 release info says: "JENA-1435: Provide extensibility of Fuseki with new services. It is now possible to add custom services to a Fuseki service, not just the services provided by

Re: Pellet with Jena frustrations

Hi Phil, there's an actively developed Pellet fork called Openllet[1]. It has some refactored and updated dependencies. Maybe it will be worth checking out. Cheers, Piotr [1]https://github.com/Galigator/openllet 2018-02-01 3:06 GMT-05:00 Phil Shields : > Hi

Re: Jena TDB to Fuseki migration problem: how to obtain entire dataset?

Could anyone comment on issues described in my previous email? Thanks, Piotr 2018-01-02 4:54 GMT-05:00 Piotr Nowara <piotrnow...@gmail.com>: > Andy, > > thank you for all those details. Now I understand why I was getting not > what I had expected. > > Got three new

Re: Maximum TDB size

Once database is corrupted there's probably not much you can do about it. Try to locate where the problem is (what triples are corrupted). If you have your data in multiple named graphs then sometimes it is enough to delete the content of the corrupted graph and not an entire database. Cheers,

Re: Jena TDB to Fuseki migration problem: how to obtain entire dataset?

st in 2018! Piotr 2017-12-23 9:44 GMT-05:00 Andy Seaborne <a...@apache.org>: > > > On 22/12/17 12:19, Piotr Nowara wrote: > ... > (semantics of HTTP operations being "copy") > ... > >> 1. Andy saying FROM clause is wrong and WHERE clause is right.

Re: Jena TDB to Fuseki migration problem: how to obtain entire dataset?

ly running. >> >> In the second, you don't actually show the query you are running after a >> commit, or how you run it. >> >> In both cases, you include a deal of commented-out queries and OntModel >> machinery. >> >> Please, a complete and minim

Re: Jena TDB to Fuseki migration problem: how to obtain entire dataset?

jar Thanks, Piotr 2017-12-20 16:52 GMT-05:00 Andy Seaborne <a...@apache.org>: > > > On 20/12/17 18:28, Piotr Nowara wrote: > >> Hi, >> >> thanks for answering so quickly. >> >> I tried two different solutions: >>

Re: Jena TDB to Fuseki migration problem: how to obtain entire dataset?

om another triple-store we were using in the past to Jena TDB that went very smoothly. I'm still wondering whether or not I'm missing something regarding Fuseki. Thanks, Piotr 2017-12-20 5:40 GMT-05:00 Andy Seaborne <a...@apache.org>: > > > On 19/12/17 21:41, Piotr Nowara wrot