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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-753) Use NIO positional read to avoid synchronization in FSIndexInput
Date Wed, 20 Dec 2006 01:40:22 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-753?page=comments#action_12459805 ] 
            
Yonik Seeley commented on LUCENE-753:
-------------------------------------

CSIndexInput synchronization could also be elimitated if there was a pread added to IndexInput

  public abstract void readBytes(byte[] b, int offset, int len, long fileposition)

Unfortunately, that would break any custom Directory based implementations out there, and
we can't provide a suitable default with seek & read because we don't know what object
to synchronize on.
Worth it or not???

> Use NIO positional read to avoid synchronization in FSIndexInput
> ----------------------------------------------------------------
>
>                 Key: LUCENE-753
>                 URL: http://issues.apache.org/jira/browse/LUCENE-753
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Store
>            Reporter: Yonik Seeley
>         Attachments: 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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