[jira] [Updated] (LUCENE-3178) Native MMapDir

["Greg Bowyer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Greg Bowyer updated LUCENE-3178:
--------------------------------

    Attachment: LUCENE-3178-Native-MMap-implementation.patch

Rough cut of a native mmap (does not do any madvise, probably insanely buggy etc etc)
                
> Native MMapDir
> --------------
>
>                 Key: LUCENE-3178
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3178
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/store
>            Reporter: Michael McCandless
>              Labels: gsoc2012, lucene-gsoc-12
>         Attachments: LUCENE-3178-Native-MMap-implementation.patch
>
>
> 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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