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https://issues.apache.org/jira/browse/LUCENE-2795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979719#action_12979719
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Michael McCandless commented on LUCENE-2795:
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https://issues.apache.org/jira/browse/LUCENE-2500?focusedCommentId=12979588&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12979588
has details on what flags to pass to OS X to bypass its buffer cache...
> 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
>
> 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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