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https://issues.apache.org/jira/browse/LUCENE-5543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13944696#comment-13944696
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ASF subversion and git services commented on LUCENE-5543:
---------------------------------------------------------
Commit 1580707 from [[email protected]] in branch 'dev/trunk'
[ https://svn.apache.org/r1580707 ]
LUCENE-5543: Add allowReadingFilesStillOpenForWrite to MockDirectoryFactory and
MockDirectoryWrapper and set it to true for cloud tests.
> Remove Directory.fileExists
> ---------------------------
>
> Key: LUCENE-5543
> URL: https://issues.apache.org/jira/browse/LUCENE-5543
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/store
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.8, 5.0
>
> Attachments: LUCENE-5543.patch
>
>
> Since 3.0.x/3.6.x (see LUCENE-5541), Lucene has substantially removed
> its reliance on fileExists to the point where I think we can fully
> remove it now.
> Like the other iffy IO methods we've removed over time (touchFile,
> fileModified, seeking back during write, ...), File.exists is
> dangerous because a low level IO issue can cause it to return false
> when it should have returned true. The fewer IO operations we rely on
> the more reliable/portable Lucene is.
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