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https://issues.apache.org/jira/browse/LUCENE-1451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650344#action_12650344
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Doug Cutting commented on LUCENE-1451:
--------------------------------------
A bit of history, if any care.
Originally Lucene synchronized only on the Directory to coordinate index
writes. This was the primary motivation for the Directory cache.
http://tinyurl.com/62ugs9#l120
Later, lock files were added, but Directory synchronization remained as an
optimization, to avoid hitting the filesystem when coordinating threads in the
same process.
http://tinyurl.com/5dzsyq#l125
Now Directory-based synchronization has been dropped entirely, so the Directory
cache can now go too.
> Can't create NIOFSDirectory w/o setting a system property
> ---------------------------------------------------------
>
> Key: LUCENE-1451
> URL: https://issues.apache.org/jira/browse/LUCENE-1451
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Yonik Seeley
> Assignee: Yonik Seeley
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1451.patch, LUCENE-1451.patch, LUCENE-1451.patch
>
>
> NIOFSDirectory.getDirectory() returns a FSDirectory object
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