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https://issues.apache.org/jira/browse/JENA-1000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14680111#comment-14680111
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Donald Pellegrino commented on JENA-1000:
-----------------------------------------
The broken run of tdbloader makes sense. If I find input for reliable
reproduction I will post that in the future. Note that the TDB database
exhibiting the corruption had been loaded with multiple tdbloader sessions as
well as uploads of files to the Apache Jena Fuseki interface over time. Some of
those operations may have been terminated before completion. Enhancements to
the bulk loaders that prevent database corruption may get at the root cause of
this issue.
> tdbdump / tdbloader sequence corrupts rdf:type predicates
> ---------------------------------------------------------
>
> Key: JENA-1000
> URL: https://issues.apache.org/jira/browse/JENA-1000
> Project: Apache Jena
> Issue Type: Bug
> Components: TDB
> Affects Versions: Jena 2.12.1, Jena 2.13.0
> Environment: Tested with tdbloader and tdbloader2 versions 2.12.1 and
> 2.13.0 on Windows/Sun Java 1.7.0_60 and CentOS 6.3/OpenJDK 1.8.0_25. tdbdump
> was 2.12.1 on CentOS 6.3/OpenJDK 1.8.0_25.
> Reporter: Donald Pellegrino
> Assignee: Andy Seaborne
> Priority: Critical
> Fix For: Jena 3.0.1
>
>
> Steps to reproduce:
> 1. A TDB database was exported to N-Quads with tdbdump.
> 2. The dump file was then imported into a new TDB database with tdbloader2.
> 3. Observe that all rdf:type predicates were replaced with the same randomly
> selected predicate.
> Work-around:
> A work-around was to run a DELETE/INSERT SPARQL command to reassign rdf:type
> predicates after the load:
> DELETE { ?s custom:200501898-4-1 ?o }
> INSERT { ?s rdf:type ?o }
> WHERE {
> ?s custom:200501898-4-1 ?o
> }
> Testing:
> The behavior was consistent across multiple reloads of the same dump file.
> tdbloader and tdbloader2 were both used for loads and they were run on both
> Windows and Linux with the same results.
> Note that this is a Critical issue as it leads to silent corruption of user
> data.
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