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https://issues.apache.org/jira/browse/LUCENE-3237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13965159#comment-13965159
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Uwe Schindler commented on LUCENE-3237:
---------------------------------------

Hi another issue:

In FSIndexOutput:
{code:java}
file.getFD().sync();
{code}

This does not do the for-loop we currently do to repeat the fsync 5 times if it 
fails. We should maybe add this here, too. Also, I would not remove 
Directory.sync(), we should maybe leave this for LUCENE-5588 to sync the 
directory itsself. But the method signature would change in any case.

> FSDirectory.fsync() may not work properly
> -----------------------------------------
>
>                 Key: LUCENE-3237
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3237
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/store
>            Reporter: Shai Erera
>         Attachments: LUCENE-3237.patch
>
>
> Spinoff from LUCENE-3230. FSDirectory.fsync() opens a new RAF, sync() its 
> FileDescriptor and closes RAF. It is not clear that this syncs whatever was 
> written to the file by other FileDescriptors. It would be better if we do 
> this operation on the actual RAF/FileOS which wrote the data. We can add 
> sync() to IndexOutput and FSIndexOutput will do that.
> Directory-wise, we should stop syncing on file names, and instead sync on the 
> IOs that performed the write operations.



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