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From "Shad Storhaug (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENENET-530) Create a truly Memory Mapped Directory type as MMapDirectory is not really memory mapped
Date Thu, 13 Jul 2017 18:47:00 GMT

     [ https://issues.apache.org/jira/browse/LUCENENET-530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shad Storhaug resolved LUCENENET-530.
-------------------------------------
       Resolution: Fixed
         Assignee: Shad Storhaug  (was: Itamar Syn-Hershko)
    Fix Version/s: Lucene.Net 4.8.0

We decided that it would be better to have an implementation closer to the one in Java, which
will scale better because it uses small chunks of memory mapped data rather than one contiguous
chunk of virtual memory. So, we didn't use this implementation, but instead have a truly memory
mapped directory that scales better.

> Create a truly Memory Mapped Directory type as MMapDirectory is not really memory mapped
> ----------------------------------------------------------------------------------------
>
>                 Key: LUCENENET-530
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-530
>             Project: Lucene.Net
>          Issue Type: Improvement
>          Components: Lucene.Net Contrib
>    Affects Versions: Lucene.Net 3.0.3
>         Environment: x64 asp.net mvc 5
>            Reporter: John Diss
>            Assignee: Shad Storhaug
>            Priority: Minor
>              Labels: features
>             Fix For: Lucene.Net 4.8.0
>
>         Attachments: lucene.net.contrib.store.patch
>
>
> MemoryMappedDirectory is  directory which uses OS memory mapping. I originally thought
it was  readonly, but now I better understand the underlying filesystem I think it behaves
normally, subject to IndexReader.ReOpen() etc



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