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https://issues.apache.org/jira/browse/LUCENE-8617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16727548#comment-16727548
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Philippe Marschall commented on LUCENE-8617:
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Is it ok if I just close this as chasing this would negatively affect tests?
> FSDirectory tries to create MMapDirectory on non default file system
> --------------------------------------------------------------------
>
> Key: LUCENE-8617
> URL: https://issues.apache.org/jira/browse/LUCENE-8617
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/store
> Affects Versions: 5.0
> Reporter: Philippe Marschall
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> {{org.apache.lucene.store.FSDirectory.open(Path, LockFactory)}} and
> {{org.apache.lucene.store.FSDirectory.open(Path)}} always assume the path is
> created on the default file system. If the path is not on the default file
> system {{MMapDirectory}} is the wrong choice as only the default file system
> can provide {{mmap()}}.
> In case of a non default file system {{SimpleFSDirectory}} is a good choice.
> See this bug for an example
> https://github.com/marschall/memoryfilesystem/issues/113
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