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https://issues.apache.org/jira/browse/LUCENE-8617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16725940#comment-16725940
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Robert Muir commented on LUCENE-8617:
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I'm not sure I agree with this statement: {quote}as only the default file
system can provide `mmap()`.{quote}
We provide mmap with non-default filesystems for testing purposes and we
override the mmap() method:
https://github.com/apache/lucene-solr/blob/master/lucene/test-framework/src/java/org/apache/lucene/mockfile/FilterFileChannel.java#L119-L122
So I don't think it makes sense to disable it based on a Filesystem.getDefault
check like the PR does.
That change would have a real impact on test coverage since we use non-default
filesystems to check for things like file descriptor leaks:
[https://lucene.apache.org/core/7_6_0/test-framework/org/apache/lucene/mockfile/package-summary.html#package.description]
> 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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