Re: Jena / Stanbol success stories?
Hi Phil, As Adam says we are using Apache Jena at the UK National Archives to power the catalogue of our digitial repository. The set up we use has Jena TDB as the triplestore and Jena Fuseki as the front end for reading and writing data over HTTP. We also use other components of the Jena project as needed, such as the Java RDF and ARQ APIs for creating the graphs and queries which are posted to Fuseki. We also use the Elda Linked Data API ( https://github.com/epimorphics/elda) implentation which provides a nice out-of-the-box means of viewing and querying the contents of the triple store without the need for users to understand SPARQL and RDF. Although it delivers all of our immediate needs I don't think we have really begun to make use of the power of this technology yet. This will come when we start to use Natural Language Processing to extract richer metadata and combine this with entity recognition and inference to extract new facts and connections. Ideally the data would also be opened to the Linked Data Cloud enabling us to make connections to other archives and authoritative organisations and to allow others to make their own connections to us. I wrote a conference paper on all of this a couple of years ago which you can read here - http://www.nationalarchives.gov.uk/documents/information-management/xml-london-tna-rw.pdf - it is a little outdated but the key facts are unchanged. HTH Rob Rob Walpole Email robkwalp...@gmail.com Tel. +44 (0)7969 869881 Skype: RobertWalpolehttp://www.linkedin.com/in/robwalpole On Mon, Nov 24, 2014 at 9:04 PM, Adam Retter adam.ret...@googlemail.com wrote: The National Archives (UK) are using Apache Jena to power the Linked-Data Catalogue which forms the backbone of their new Digital Archive system (DRI). They are also using Fuseki and Elda which are related to Jena. I no longer work on the project, but Rob (Cc'd) might be able to tell you more if you want to know. On 24 November 2014 at 03:19, Phillip Rhodes motley.crue@gmail.com wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM -- Adam Retter skype: adam.retter tweet: adamretter http://www.adamretter.org.uk
Re: Thread pool not shutting down properly
Stephen,
(version?)
How are you shutting down tomcat?
It could be that the problem is that the thread is not a daemon thread
which can block the JVM exiting when the main thread returns.
Does this happen every time because I through that when all timers
expired, the ScheduledThreadPoolExecutor did not block JVM exiting (but
I have not tried in anger).
Unrelated question inline:
On 25/11/14 02:40, Stephen Owens wrote:
Folks,
I'm seeing a problem with a thread pool blocking shutdown of Tomcat. The
pool seems to be created by the AlarmClock class in Jena which I think is
being instantiated from QueryExecutionBase. The problem only seems to occur
if I execute a SPARQL query with a timeout set like so:
QueryExecution queryExec = QueryExecutionFactory.create(query, model);
queryExec.setTimeout(queryTimeout);
I have a work around for the behaviour by manually releasing the clock
using a hack that causes grown developers to cry. In a class invoked at
application shutdown I do this:
private final AlarmClock defaultAlarmClock = AlarmClock.get();
public void shutdown()
{
defaultAlarmClock.release();
}
I'm assuming that this is not actually required and that I'm doing
something wrong executing the SPARQL or terminating the query. Any hints
are most welcome. Here's the full version of the SPARQL execution code in
case it is of use in helping locate the issue:
SetTriple results = new HashSetTriple();
results.add(new AttachedTripleImpl(statement));
So AttachedTripleImpl extends Triple?
We're discussing interface-izing triples for Jena3. Would that
help/hinder you?
Andy
Re: Jena / Stanbol success stories?
Phillip From a commercial standpoint it is worth noting that several major triple store vendors actually use various parts of the Jena stack to provide some parts of their RDF and SPARQL implementations. Details differ by vendor but my rough understanding is as follows: - Cray (my employer) uses the ARQ library for SPARQL parsing and optimisation - IBM uses ARQ and Fuseki as the Java and HTTP front ends to their RDF store (http://www-01.ibm.com/software/data/db2/linux-unix-windows/nosql-support.h tml) - Oracle uses ARQ as their Java API to their RDF store (https://docs.oracle.com/database/121/RDFRM/sem_jena.htm#RDFRM234) All of these vendors have made presentations about their RDF stores at various conferences if you are interested in more details and use cases. These vendors would not be selling these products if they did not have customers buying these products. Like any technology Apache Jena by itself does not magically deliver, it is a framework that enables you to implement a whole range of different approaches and whether they are for real really depends on what you want to do and how well you execute it. Rob On 24/11/2014 03:19, Phillip Rhodes motley.crue@gmail.com wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM
Re: Jena / Stanbol success stories?
On 24/11/14 03:19, Phillip Rhodes wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM Ordnance Survey Linked Data http://data.ordnancesurvey.co.uk/datasets/os-linked-data has Apache Jena Fuseki behind it though it isn't mentioned but the documentation describes a Fuseki specific error message for timeouts. The Apache License does not require attribution for using binaries, but it would be nice to at least acknowledge use. Andy
Re: Jena / Stanbol success stories?
Hi Phil, the Redlink Platform combines both Stanbol and Marmotta following a PaaS approach, if that count for you as for real. Further details at http://dev.redlink.io/api Cheers, On 25/11/14 11:23, Rob Walpole wrote: Hi Phil, As Adam says we are using Apache Jena at the UK National Archives to power the catalogue of our digitial repository. The set up we use has Jena TDB as the triplestore and Jena Fuseki as the front end for reading and writing data over HTTP. We also use other components of the Jena project as needed, such as the Java RDF and ARQ APIs for creating the graphs and queries which are posted to Fuseki. We also use the Elda Linked Data API ( https://github.com/epimorphics/elda) implentation which provides a nice out-of-the-box means of viewing and querying the contents of the triple store without the need for users to understand SPARQL and RDF. Although it delivers all of our immediate needs I don't think we have really begun to make use of the power of this technology yet. This will come when we start to use Natural Language Processing to extract richer metadata and combine this with entity recognition and inference to extract new facts and connections. Ideally the data would also be opened to the Linked Data Cloud enabling us to make connections to other archives and authoritative organisations and to allow others to make their own connections to us. I wrote a conference paper on all of this a couple of years ago which you can read here - http://www.nationalarchives.gov.uk/documents/information-management/xml-london-tna-rw.pdf - it is a little outdated but the key facts are unchanged. HTH Rob Rob Walpole Email robkwalp...@gmail.com Tel. +44 (0)7969 869881 Skype: RobertWalpolehttp://www.linkedin.com/in/robwalpole On Mon, Nov 24, 2014 at 9:04 PM, Adam Retter adam.ret...@googlemail.com wrote: The National Archives (UK) are using Apache Jena to power the Linked-Data Catalogue which forms the backbone of their new Digital Archive system (DRI). They are also using Fuseki and Elda which are related to Jena. I no longer work on the project, but Rob (Cc'd) might be able to tell you more if you want to know. On 24 November 2014 at 03:19, Phillip Rhodes motley.crue@gmail.com wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM -- Adam Retter skype: adam.retter tweet: adamretter http://www.adamretter.org.uk -- Sergio Fernández Senior Researcher Knowledge and Media Technologies Salzburg Research Forschungsgesellschaft mbH Jakob-Haringer-Straße 5/3 | 5020 Salzburg, Austria T: +43 662 2288 318 | M: +43 660 2747 925 sergio.fernan...@salzburgresearch.at http://www.salzburgresearch.at
Re: Jena / Stanbol success stories?
In the Listening Experience Database, we are using Fuseki and the Stanbol Entityhub backing up Drupal 7 to support a crowd-sourced linked dataset. http://www.open.ac.uk/Arts/LED http://led.kmi.open.ac.uk/linkeddata/ best Alessandro On 24/11/2014 03:19, Phillip Rhodes wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM . -- The Open University is incorporated by Royal Charter (RC 000391), an exempt charity in England Wales and a charity registered in Scotland (SC 038302). The Open University is authorised and regulated by the Financial Conduct Authority.
Re: Thread pool not shutting down properly
Sorry, version is 2.11.1
Yes, it happens every time. We shut down using the standard ./shutdown.sh
script in tomcat/bin. It's a bit hard to create a reproducible on it but I
could give it a shot to see if I can prove that the thread pool does block
even after expiry. You're right that it's not a daemon.
Interface-izing would help = very good thing imho.
On Tue, Nov 25, 2014 at 6:02 AM, Andy Seaborne a...@apache.org wrote:
Stephen,
(version?)
How are you shutting down tomcat?
It could be that the problem is that the thread is not a daemon thread
which can block the JVM exiting when the main thread returns.
Does this happen every time because I through that when all timers
expired, the ScheduledThreadPoolExecutor did not block JVM exiting (but I
have not tried in anger).
Unrelated question inline:
On 25/11/14 02:40, Stephen Owens wrote:
Folks,
I'm seeing a problem with a thread pool blocking shutdown of Tomcat. The
pool seems to be created by the AlarmClock class in Jena which I think is
being instantiated from QueryExecutionBase. The problem only seems to
occur
if I execute a SPARQL query with a timeout set like so:
QueryExecution queryExec = QueryExecutionFactory.create(query, model);
queryExec.setTimeout(queryTimeout);
I have a work around for the behaviour by manually releasing the clock
using a hack that causes grown developers to cry. In a class invoked at
application shutdown I do this:
private final AlarmClock defaultAlarmClock = AlarmClock.get();
public void shutdown()
{
defaultAlarmClock.release();
}
I'm assuming that this is not actually required and that I'm doing
something wrong executing the SPARQL or terminating the query. Any hints
are most welcome. Here's the full version of the SPARQL execution code in
case it is of use in helping locate the issue:
SetTriple results = new HashSetTriple();
results.add(new AttachedTripleImpl(statement));
So AttachedTripleImpl extends Triple?
We're discussing interface-izing triples for Jena3. Would that
help/hinder you?
Andy
--
Regards,
*Stephen Owens*
CTO, ThoughtWire
t 647.351.9473 ext.104 I m 416.697.3466
Re: Jena / Stanbol success stories?
Thanks Bob, that's good to know! Phil This message optimized for indexing by NSA PRISM On Mon, Nov 24, 2014 at 3:54 PM, Bob DuCharme b...@snee.com wrote: Hi Phil, TopQuadrant's TopBraid platform (and hence our entire product line) has been built on Jena since before Stanbol existed. See http://www.topquadrant.com/technology/topbraid-platform-overview/ for an overview. We don't use Stanbol but I've been meaning to look harder at it myself. We also don't use Fuseki, but that's another Jena success story. Bob DuCharme On 11/23/2014 10:19 PM, Phillip Rhodes wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM
Re: Jena / Stanbol success stories?
Hey Andy, thanks very much. This is great stuff. Phil This message optimized for indexing by NSA PRISM On Tue, Nov 25, 2014 at 6:25 AM, Andy Seaborne a...@apache.org wrote: On 24/11/14 03:19, Phillip Rhodes wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM Ordnance Survey Linked Data http://data.ordnancesurvey.co.uk/datasets/os-linked-data has Apache Jena Fuseki behind it though it isn't mentioned but the documentation describes a Fuseki specific error message for timeouts. The Apache License does not require attribution for using binaries, but it would be nice to at least acknowledge use. Andy
Re: Jena / Stanbol success stories?
That's really useful, thank you so much! Phil This message optimized for indexing by NSA PRISM On Tue, Nov 25, 2014 at 5:23 AM, Rob Walpole robkwalp...@gmail.com wrote: Hi Phil, As Adam says we are using Apache Jena at the UK National Archives to power the catalogue of our digitial repository. The set up we use has Jena TDB as the triplestore and Jena Fuseki as the front end for reading and writing data over HTTP. We also use other components of the Jena project as needed, such as the Java RDF and ARQ APIs for creating the graphs and queries which are posted to Fuseki. We also use the Elda Linked Data API ( https://github.com/epimorphics/elda) implentation which provides a nice out-of-the-box means of viewing and querying the contents of the triple store without the need for users to understand SPARQL and RDF. Although it delivers all of our immediate needs I don't think we have really begun to make use of the power of this technology yet. This will come when we start to use Natural Language Processing to extract richer metadata and combine this with entity recognition and inference to extract new facts and connections. Ideally the data would also be opened to the Linked Data Cloud enabling us to make connections to other archives and authoritative organisations and to allow others to make their own connections to us. I wrote a conference paper on all of this a couple of years ago which you can read here - http://www.nationalarchives.gov.uk/documents/information-management/xml-london-tna-rw.pdf - it is a little outdated but the key facts are unchanged. HTH Rob Rob Walpole Email robkwalp...@gmail.com Tel. +44 (0)7969 869881 Skype: RobertWalpolehttp://www.linkedin.com/in/robwalpole On Mon, Nov 24, 2014 at 9:04 PM, Adam Retter adam.ret...@googlemail.com wrote: The National Archives (UK) are using Apache Jena to power the Linked-Data Catalogue which forms the backbone of their new Digital Archive system (DRI). They are also using Fuseki and Elda which are related to Jena. I no longer work on the project, but Rob (Cc'd) might be able to tell you more if you want to know. On 24 November 2014 at 03:19, Phillip Rhodes motley.crue@gmail.com wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM -- Adam Retter skype: adam.retter tweet: adamretter http://www.adamretter.org.uk
Re: Jena / Stanbol success stories?
Hey Rob, thanks for the pointers. Much appreciated. Phil This message optimized for indexing by NSA PRISM On Tue, Nov 25, 2014 at 6:07 AM, Rob Vesse rve...@dotnetrdf.org wrote: Phillip From a commercial standpoint it is worth noting that several major triple store vendors actually use various parts of the Jena stack to provide some parts of their RDF and SPARQL implementations. Details differ by vendor but my rough understanding is as follows: - Cray (my employer) uses the ARQ library for SPARQL parsing and optimisation - IBM uses ARQ and Fuseki as the Java and HTTP front ends to their RDF store (http://www-01.ibm.com/software/data/db2/linux-unix-windows/nosql-support.h tml) - Oracle uses ARQ as their Java API to their RDF store (https://docs.oracle.com/database/121/RDFRM/sem_jena.htm#RDFRM234) All of these vendors have made presentations about their RDF stores at various conferences if you are interested in more details and use cases. These vendors would not be selling these products if they did not have customers buying these products. Like any technology Apache Jena by itself does not magically deliver, it is a framework that enables you to implement a whole range of different approaches and whether they are for real really depends on what you want to do and how well you execute it. Rob On 24/11/2014 03:19, Phillip Rhodes motley.crue@gmail.com wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM
Re: Jena / Stanbol success stories?
The Linked Open Data endpoint of The Open University is built on top of Jena Fuseki. http://data.open.ac.uk/ Best, Enrico -- Enrico Daga Project Officer - Linked Data KMi - Knowledge Media Institute The Open University email: enrico.d...@open.ac.uk skype: enri-pan On 25 November 2014 at 18:11, Phillip Rhodes motley.crue@gmail.com wrote: Hey Rob, thanks for the pointers. Much appreciated. Phil This message optimized for indexing by NSA PRISM On Tue, Nov 25, 2014 at 6:07 AM, Rob Vesse rve...@dotnetrdf.org wrote: Phillip From a commercial standpoint it is worth noting that several major triple store vendors actually use various parts of the Jena stack to provide some parts of their RDF and SPARQL implementations. Details differ by vendor but my rough understanding is as follows: - Cray (my employer) uses the ARQ library for SPARQL parsing and optimisation - IBM uses ARQ and Fuseki as the Java and HTTP front ends to their RDF store (http://www-01.ibm.com/software/data/db2/linux-unix-windows/nosql-support.h tml) - Oracle uses ARQ as their Java API to their RDF store (https://docs.oracle.com/database/121/RDFRM/sem_jena.htm#RDFRM234) All of these vendors have made presentations about their RDF stores at various conferences if you are interested in more details and use cases. These vendors would not be selling these products if they did not have customers buying these products. Like any technology Apache Jena by itself does not magically deliver, it is a framework that enables you to implement a whole range of different approaches and whether they are for real really depends on what you want to do and how well you execute it. Rob On 24/11/2014 03:19, Phillip Rhodes motley.crue@gmail.com wrote: Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM -- The Open University is incorporated by Royal Charter (RC 000391), an exempt charity in England Wales and a charity registered in Scotland (SC 038302). The Open University is authorised and regulated by the Financial Conduct Authority.
Re: Jena / Stanbol success stories?
Our Semantic Linked Data management platform www.tasorone.com uses Jena's ARQ and offers Jena TDB based implementation as a default triplestore. Regards,Milorad From: Phillip Rhodes motley.crue@gmail.com To: users@jena.apache.org; d...@stanbol.apache.org Sent: Monday, November 24, 2014 4:19 AM Subject: Jena / Stanbol success stories? Hi all, I was just wondering if anybody knows of, or is involved with, any projects using Jena and/or Stanbol which (have been|can be) discussed and cited publicly? A local company that I've been talking to is interested in possibly using SemWeb technology (specifically, Jena/Stanbol) internally, but are looking for some evidence to support the assertion that this technology delivers and is for real. Any pointers or references would be appreciated... or if you are personally involved in something and are willing to talk about it (possibly with appropriate NDAs, etc. in place), I'd love to talk to you. Thanks, Phil --- This message optimized for indexing by NSA PRISM
Are there graph/table based tools for browsing/editing a large TDB store?
Hi all, I want a graph/table based tool to browse/edit an large ontology stored in a TDB store. Although Protege is a very good ontology editor, it needs a large amount of memory resources to open an large ontology file. And both desktop Protege and Web Protege cannot access TDB store. Any suggestions or recommendation would be appreciated. Thank you very much. Deyan Chen --- Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s) is intended only for the use of the intended recipient and may be confidential and/or privileged of Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is not the intended recipient, unauthorized use, forwarding, printing, storing, disclosure or copying is strictly prohibited, and may be unlawful.If you have received this communication in error,please immediately notify the sender by return e-mail, and delete the original message and all copies from your system. Thank you. ---
Re: Are there graph/table based tools for browsing/editing a large TDB store?
Hello Deyan, How big is the ontology? Do you want to prune ontology or edit the ontology by adding and deleting axioms? Thanks Kamalraj On 26 Nov 2014, at 12:26 pm, Deyan Chen chende...@neusoft.commailto:chende...@neusoft.com wrote: Hi all, I want a graph/table based tool to browse/edit an large ontology stored in a TDB store. Although Protege is a very good ontology editor, it needs a large amount of memory resources to open an large ontology file. And both desktop Protege and Web Protege cannot access TDB store. Any suggestions or recommendation would be appreciated. Thank you very much. Deyan Chen
Re: Are there graph/table based tools for browsing/editing a large TDB store?
Hi kamalraj, Thank you for your reply. Now the size of my ontology is about 2GB. I mainly want to supply an ontology maintenance tool for business professionals so as to they can easily browse or edit the ontology data(especially instance data and their relationships). And I hope this tool can support blank node. Deyan Chen 在 2014年11月26日 09:49, Kamalraj Jairam 写道: Hello Deyan, How big is the ontology? Do you want to prune ontology or edit the ontology by adding and deleting axioms? Thanks Kamalraj On 26 Nov 2014, at 12:26 pm, Deyan Chen chende...@neusoft.commailto:chende...@neusoft.com wrote: Hi all, I want a graph/table based tool to browse/edit an large ontology stored in a TDB store. Although Protege is a very good ontology editor, it needs a large amount of memory resources to open an large ontology file. And both desktop Protege and Web Protege cannot access TDB store. Any suggestions or recommendation would be appreciated. Thank you very much. Deyan Chen --- Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s) is intended only for the use of the intended recipient and may be confidential and/or privileged of Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is not the intended recipient, unauthorized use, forwarding, printing, storing, disclosure or copying is strictly prohibited, and may be unlawful.If you have received this communication in error,please immediately notify the sender by return e-mail, and delete the original message and all copies from your system. Thank you. ---
Query aborts with 502 behind reverse proxy
I use Fuseki behind a apache reverse proxy. A query which takes about 90 seconds when put directly to Jetty, aborts invariably after 60 seconds with an The proxy server received an invalid response from an upstream server. The proxy server could not handle the request message by apache. In the apache config, I set all values known to me to 10 minutes: Keepalive On Timeout 600 ProxyTimeout 600 ProxyPass /beta/sparql/thesozv/query http://127.0.0.1:3030/thesozv/query timeout=600 Keepalive=On ProxyPassReverse /beta/sparql/thesozv/query http://127.0.0.1:3030/thesozv/query Jetty configuration is a bit a black box for me. However I found that there seems to be a 60 second default timeout in the ProxyServlet (init parameter timeout - http://www.eclipse.org/jetty/documentation/current/proxy-servlet.html). I'm not sure if this setting is involved at all, and how I could set it, or what could be wrong otherwise. Help would be greatly appreciated. Cheers, Joachim
