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https://issues.apache.org/jira/browse/JENA-1122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15126164#comment-15126164
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ASF GitHub Bot commented on JENA-1122:
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Github user afs commented on the pull request:
https://github.com/apache/jena/pull/123#issuecomment-177941348
It needs to be a singleton of some kind; a static map is one way to do
singletons. There is only one Fuseki server per JVM.
c.f. `DataAccessPointRegistry` and `Registry<K,T>`.
Referencing counting the service to dataset linkage would be good because
it builds for any future deleting of datasets from a running server.
> Fuseki fails to start if configured with two services that share the same
> dataset with a lucene index.
> ------------------------------------------------------------------------------------------------------
>
> Key: JENA-1122
> URL: https://issues.apache.org/jira/browse/JENA-1122
> Project: Apache Jena
> Issue Type: Bug
> Components: Text
> Affects Versions: Jena 3.0.0, Fuseki 2.3.0
> Reporter: Brian McBride
>
> This problem arises when the assemblers for the two services run. For each
> service, a separate TextIndexLucene object is created. Both of those objects
> try to lock the same Lucene index directory and one fails.
> A proposed fix is to modify the TextDatasetFactory to only create one
> TextIndexLucene object per on disk directory.
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