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https://issues.apache.org/jira/browse/LUCENE-3237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13964814#comment-13964814
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Uwe Schindler commented on LUCENE-3237:
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Hi [~mikemccand],
{{FSDirectory.FSIndexOutput#sync()}} should call flush() before syncing the
underlying file. Otherwise it could happen that not all buffers of
BufferedIndexOutput are flushed. Maybe other code does this already, but to be
safe, it should definitely call this!
> 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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