You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@jena.apache.org by GitBox <gi...@apache.org> on 2022/12/19 15:17:35 UTC
[GitHub] [jena] Aklakan opened a new issue, #1688: Service Enhancer: Cache hits with empty result sets may cut off bulk request results
Aklakan opened a new issue, #1688:
URL: https://github.com/apache/jena/issues/1688
### Version
4.7.0-SNAPSHOT
### What happened?
Credits once again to @LorenzBuehmann for spotting this.
The second execution of a query making use of caching such as below may return an incomplete result set. The reason is due to a bug in `QueryIterServiceBulk`: If a cache lookup detects that an empty result set has to be served then the returned empty iterator is not properly registered in the overall result iterator.
```sparql
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT * {
{ SELECT * { ?s a rdfs:Resource } ORDER BY ?s }
# Evaluation of this following pattern on the example data occasionally
# creates cache entries with empty result sets
SERVICE <loop:cache:bulk+20> { ?s rdfs:label ?l }
}
```
Example data:
```
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
<urn:example:aa> a rdfs:Resource ; rdfs:label "aa" .
<urn:example:ab> a rdfs:Resource .
<urn:example:ac> a rdfs:Resource .
<urn:example:ad> a rdfs:Resource ; rdfs:label "ad" .
```
### Relevant output and stacktrace
_No response_
### Are you interested in making a pull request?
Maybe
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: issues-unsubscribe@jena.apache.org.apache.org
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@jena.apache.org
For additional commands, e-mail: issues-help@jena.apache.org
[GitHub] [jena] afs closed issue #1688: Service Enhancer: Cache hits with empty result sets may cut off bulk request results
Posted by GitBox <gi...@apache.org>.
afs closed issue #1688: Service Enhancer: Cache hits with empty result sets may cut off bulk request results
URL: https://github.com/apache/jena/issues/1688
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: issues-unsubscribe@jena.apache.org
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@jena.apache.org
For additional commands, e-mail: issues-help@jena.apache.org