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Posted to dev@lucene.apache.org by "Steve Rowe (JIRA)" <ji...@apache.org> on 2013/01/13 00:00:13 UTC
[jira] [Updated] (LUCENE-1743) MMapDirectory should only mmap large
files, small files should be opened using SimpleFS/NIOFS
[ https://issues.apache.org/jira/browse/LUCENE-1743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Rowe updated LUCENE-1743:
-------------------------------
Fix Version/s: (was: 4.1)
4.2
> MMapDirectory should only mmap large files, small files should be opened using SimpleFS/NIOFS
> ---------------------------------------------------------------------------------------------
>
> Key: LUCENE-1743
> URL: https://issues.apache.org/jira/browse/LUCENE-1743
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/store
> Affects Versions: 2.9
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 4.2
>
>
> This is a followup to LUCENE-1741:
> Javadocs state (in FileChannel#map): "For most operating systems, mapping a file into memory is more expensive than reading or writing a few tens of kilobytes of data via the usual read and write methods. From the standpoint of performance it is generally only worth mapping relatively large files into memory."
> MMapDirectory should get a user-configureable size parameter that is a lower limit for mmapping files. All files with a size<limit should be opened using a conventional IndexInput from SimpleFS or NIO (another configuration option for the fallback?).
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