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Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2011/04/24 01:27:05 UTC
[jira] [Commented] (LUCENE-2795) Genericize DirectIOLinuxDir ->
UnixDir
[ https://issues.apache.org/jira/browse/LUCENE-2795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13023614#comment-13023614 ]
Michael McCandless commented on LUCENE-2795:
--------------------------------------------
It looks like recent Linux kernels have better behavior with SEQUENTIAL flag: http://blog.mikemccandless.com/2010/06/lucene-and-fadvisemadvise.html?showComment=1303235497682#c2572106601600642254
If possible we should test on kernels after that patch was merged to see if passing SEQUENTIAL for merging prevents eviction of hot pages being used for searching...
> Genericize DirectIOLinuxDir -> UnixDir
> --------------------------------------
>
> Key: LUCENE-2795
> URL: https://issues.apache.org/jira/browse/LUCENE-2795
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Store
> Reporter: Michael McCandless
> Assignee: Simon Willnauer
> Labels: gsoc2011, lucene-gsoc-11, mentor
>
> Today DirectIOLinuxDir is tricky/dangerous to use, because you only want to use it for indexWriter and not IndexReader (searching). It's a trap.
> But, once we do LUCENE-2793, we can make it fully general purpose because then a single native Dir impl can be used.
> I'd also like to make it generic to other Unices, if we can, so that it becomes UnixDirectory.
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