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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618628#action_12618628
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Michael McCandless commented on LUCENE-753:
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bq. I just tried out the latest NIOFSDirectory patch and I'm seeing a bug. If I
go back to the regular FSDirectory, everything works fine.
Is the index itself corrupt, ie, NIOFSDirectory did something bad when writing
the index? Or, is it only in reading the index with NIOFSDirectory that you
see this? IE, can you swap in FSDirectory on your existing index and the
problem goes away?
> Use NIO positional read to avoid synchronization in FSIndexInput
> ----------------------------------------------------------------
>
> Key: LUCENE-753
> URL: https://issues.apache.org/jira/browse/LUCENE-753
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Store
> Reporter: Yonik Seeley
> Attachments: FileReadTest.java, FileReadTest.java, FileReadTest.java,
> FileReadTest.java, FileReadTest.java, FileReadTest.java, FileReadTest.java,
> FSDirectoryPool.patch, FSIndexInput.patch, FSIndexInput.patch,
> lucene-753.patch, lucene-753.patch
>
>
> As suggested by Doug, we could use NIO pread to avoid synchronization on the
> underlying file.
> This could mitigate any MT performance drop caused by reducing the number of
> files in the index format.
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