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https://issues.apache.org/jira/browse/LUCENE-6056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-6056.
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    Resolution: Not a Problem

The doc that 'where dest does not exist' is exactly the relaxation here.

> JavaDocs of Directory.renameFile are misleading 
> ------------------------------------------------
>
>                 Key: LUCENE-6056
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6056
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: general/javadocs
>            Reporter: Boaz Leskes
>            Priority: Minor
>
> The java docs of org.apache.lucene.store.Directory#renameFile read:
>    * Renames {@code source} to {@code dest} as an atomic operation,
>    * where {@code dest} does not yet exist in the directory.
> However in FSDirectory we do:
>  Files.move(directory.resolve(source), directory.resolve(dest), 
> StandardCopyOption.ATOMIC_MOVE);
> That one does not give us the documented behavior. From the javadocs of 
> Files.move, with StandardCopyOption.ATOMIC_MOVE:
> The move is performed as an atomic file system operation and all other 
> options are ignored. If the target file exists then it is implementation 
> specific if the existing file is replaced or this method fails by throwing an 
> IOException.
> I think the  use of atomic moves is good here but it means  the java docs of 
> the Directory.renameFiles should be changed and relax the guarantee. 



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