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

["Yonik Seeley (JIRA)" <ji...@apache.org>]

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

Yonik Seeley updated LUCENE-753:
--------------------------------

    Attachment: FileReadTest.java

Updated test that fixes some thread synchronization issues to ensure that the "answer" is the same for all methods.

Brian, in some of your tests the answer is "0"... is this because your test file consists of zeros (created via /dev/zero or equiv)?  UNIX systems treat blocks of zeros differently than normal files (they are stored as holes).  It shouldn't make too much of a difference in this case, but just to be sure, could you try with a real file?


> 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, FSIndexInput.patch, FSIndexInput.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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