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https://issues.apache.org/jira/browse/LUCENE-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048821#comment-13048821
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Uwe Schindler commented on LUCENE-3198:
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Thats fine, I just wanted to talk about the whole issue what to enable when and
bring together all possible platform possibilities. In general we should per
default only enable SimpleFSDirectory on unknown platforms. Maybe NIO is
heavily broken on OS XY (Android *lol*)?
> Change default Directory impl on 64bit linux to MMap
> ----------------------------------------------------
>
> Key: LUCENE-3198
> URL: https://issues.apache.org/jira/browse/LUCENE-3198
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/store
> Reporter: Michael McCandless
> Fix For: 3.3, 4.0
>
>
> Consistently in my NRT testing on Fedora 13 Linux, 64 bit JVM (Oracle
> 1.6.0_21) I see MMapDir getting better search and merge performance when
> compared to NIOFSDir.
> I think we should fix the default.
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