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https://issues.apache.org/jira/browse/LUCENE-5570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-5570.
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Resolution: Won't Fix
> FSDirectory's fsync() is lenient
> --------------------------------
>
> Key: LUCENE-5570
> URL: https://issues.apache.org/jira/browse/LUCENE-5570
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/store
> Reporter: Robert Muir
> Fix For: 4.8, 5.0, 4.7.2
>
> Attachments: LUCENE-5570.patch, LUCENE-5570.patch,
> LUCENE-5570_java6.patch, LUCENE-5570_zerobyte.patch
>
>
> This method has a lot of problems:
> 1. it tracks 'stale files' as it writes (this seems pointless), and only
> actually fsyncs the intersection of that 'stale files' and the filenames
> passed as argument to sync(). So any bogus names passed to sync() are just
> silently ignored
> 2. if "something bad happens" (e.g. two indexwriters/dirs on the same path,
> or some other shenanigans), and the file is actually in stale files, but was
> say actually deleted on the filesystem, the underlying fsync() call will
> create a new 0-byte file and fsync that.
> In my opinion we should do none of this. we should throw exceptions when this
> stuff is wrong.
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