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https://issues.apache.org/jira/browse/LUCENE-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095356#comment-13095356
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Varun Thacker commented on LUCENE-3178:
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Just realized what was wrong. I was using the javadocs from version 3.3 on not
from the trunk. Stupid mistake on my part. Sorry to bring that up.
> Native MMapDir
> --------------
>
> Key: LUCENE-3178
> URL: https://issues.apache.org/jira/browse/LUCENE-3178
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/store
> Reporter: Michael McCandless
>
> Spinoff from LUCENE-2793.
> Just like we will create native Dir impl (UnixDirectory) to pass the right OS
> level IO flags depending on the IOContext, we could in theory do something
> similar with MMapDir.
> The problem is MMap is apparently quite hairy... and to pass the flags the
> native code would need to invoke mmap (I think?), unlike UnixDir where the
> code "only" has to open the file handle.
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