[jira] [Resolved] (LUCENE-3092) NRTCachingDirectory, to buffer small segments in a RAMDir

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-3092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless resolved LUCENE-3092.
----------------------------------------

    Resolution: Fixed

> NRTCachingDirectory, to buffer small segments in a RAMDir
> ---------------------------------------------------------
>
>                 Key: LUCENE-3092
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3092
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/store
>            Reporter: Michael McCandless
>            Priority: Minor
>             Fix For: 3.2, 4.0
>
>         Attachments: LUCENE-3092-listener.patch, LUCENE-3092.patch, LUCENE-3092.patch, LUCENE-3092.patch, LUCENE-3092.patch
>
>
> I created this simply Directory impl, whose goal is reduce IO
> contention in a frequent reopen NRT use case.
> The idea is, when reopening quickly, but not indexing that much
> content, you wind up with many small files created with time, that can
> possibly stress the IO system eg if merges, searching are also
> fighting for IO.
> So, NRTCachingDirectory puts these newly created files into a RAMDir,
> and only when they are merged into a too-large segment, does it then
> write-through to the real (delegate) directory.
> This lets you spend some RAM to reduce I0.

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