[jira] Updated: (LUCENE-753) Use NIO positional read to avoid synchronization in FSIndexInput

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-753:
--------------------------------------

    Attachment: LUCENE-753.patch

Attached new rev of NIOFSDirectory.

Besides re-fixing LUCENE-1262, I also found & fixed a bug in the NIOFSIndexInput.clone() method.

Matthew, could you give this one a shot to see if it fixes your case?  Thanks.

> 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, 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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