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From "robert engels (JIRA)" <>
Subject [jira] Commented: (LUCENE-753) Use NIO positional read to avoid synchronization in FSIndexInput
Date Sun, 31 Aug 2008 15:23:44 GMT


robert engels commented on LUCENE-753:

SUN is accepting outside bug fixes to the Open JDK, and merging them to the commercial JDK
(in most cases).

If the underlying bug is fixed in the Windows JDK - not too hard - then you fix this properly
in Lucene.

If you don't fix it in the JDK you are always going to have the 'running out of file handles'
synchronization, vs, the "locked position" synchronization - there is no way to fix this in
user code...

> Use NIO positional read to avoid synchronization in FSIndexInput
> ----------------------------------------------------------------
>                 Key: LUCENE-753
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Store
>            Reporter: Yonik Seeley
>            Assignee: Michael McCandless
>         Attachments:,,,,,,, FSDirectoryPool.patch, FSIndexInput.patch,
FSIndexInput.patch, LUCENE-753.patch, LUCENE-753.patch, LUCENE-753.patch, LUCENE-753.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
> This could mitigate any MT performance drop caused by reducing the number of files in
the index format.

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