[ http://issues.apache.org/jira/browse/LUCENE-753?page=all ]
Yonik Seeley updated LUCENE-753:
--------------------------------
Attachment: FSIndexInput.patch
Here is a patch that directly extends IndexInput to make things a little easier.
I started with the code for BufferedIndexInput to avoid any bugs in read().
They share enough code that a common subclass could be factored out if desired
(or changes made in BufferedIndexInput to enable easier sharing).
ByteBuffer does have offset, length, etc, but I did not use them because
BufferedIndexInput currently allocates the byte[] on demand, and thus would add
additional checks to readByte(). Also, the NIO Buffer.get() isn't as efficient
as our own array access.
> 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, 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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