[JENA-1522] Unable to consistently retrieve data from large dataset

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: Jena 3.6.0
• Component/s: Fuseki, Jena

Environment

System 1:  Centos 7, Jena 3.6, Unknown Fuseki version.

System 2:  Ubuntu 16.04 running Docker.  Running stain/jena-fuseki from the official Docker Hub.

 

• Assignee: Unassigned
• Reporter: Brian Mullen
• Created: 12/Apr/18 18:27
• Updated: 02/Aug/18 10:47
• Resolved: 02/Aug/18 10:46

Description

In my 500M+ triple dataset, queries seem to be failing for no clear reason. Here's an example.

prefix Products: <http://www.example.com/test/Products#> 
select ?p ?o 
where { 
    Products:ABC ?p ?o . 
}

...results in a list like:

Products:HasComponent Products:DEF 
Products:HasComponent Products:GHI 

Now running this query:

prefix Products: <http://www.example.com/test/Products#> 
select ?p 
where { 
    Products:ABC ?p Products:DEF . 
} 

...has no results. How is this possible?

 

Here's another example.

prefix Products: <http://www.example.com/test/Products#> 
ask where { 
    Products:ABC Products:PartNumber ?p . 
    filter ( ?p = "ABC" ) 
} 

This returns "True"

 

prefix Products: <http://www.example.com/test/Products#> 
ask where { 
    ?s Products:PartNumber ?p . 
    filter ( ?p = "ABC" ) 
} 

This returns "False"

 

What other info can I provide?

Issue Links

• is duplicated by: JENA-1553 Can't Backup data - java.io.IOException: Illegal UTF-8: 0xFFFFFFB1