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From "robert engels (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-753) Use NIO positional read to avoid synchronization in FSIndexInput
Date Tue, 01 Jul 2008 11:59:45 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609537#action_12609537
] 

robert engels commented on LUCENE-753:
--------------------------------------

As I stated quit a while ago, this has been a long accepted bug in the JDK.

See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6265734

It was filed and accepted over 3 years ago.

The problem is that the pread performs an unnecessary lock on the file descriptor, instead
of using Windows "overlapped" reads.

> 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, FSIndexInput.patch, FSIndexInput.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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