[jira] [Commented] (JENA-1122) Fuseki fails to start if configured with two services that share the same dataset with a lucene index.

["Andy Seaborne (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-1122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15110631#comment-15110631 ] 

Andy Seaborne commented on JENA-1122:
-------------------------------------

>From JENA-1104, for reference.

But just addressing the text index part will not work and it needs to have a shared dataset.

----
Opening the text index twice causes the problem.

{noformat}
    public static void mainText(String... args) throws IOException {
        Directory dir = FSDirectory.open(new File("TEXT")) ;
        EntityDefinition def = new EntityDefinition("uri", "text") ;
        TextIndexConfig conf = new TextIndexConfig(def) ;
        System.out.println("Index 1") ;
        TextDatasetFactory.createLuceneIndex(dir, conf) ;
        System.out.println("Index 2") ;
        TextDatasetFactory.createLuceneIndex(dir, conf) ;
        System.out.println("DONE") ;
    }
{noformat}

> 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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