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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624905#action_12624905
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Matthew Mastracci commented on LUCENE-753:
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bq. Matthew, could you give this one a shot to see if it fixes your case?
Thanks.
Michael,
I ran this new patch against our big index and it works very well. If I have
time, I'll run some benchmarks to see what our real-life performance
improvements are like.
Note that I'm only running it for our read-only snapshot of the index, however,
so this hasn't been tested for writing to a large index.
> 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
> Assignee: Michael McCandless
> Fix For: 2.4
>
> Attachments: FileReadTest.java, FileReadTest.java, FileReadTest.java,
> FileReadTest.java, FileReadTest.java, FileReadTest.java, FileReadTest.java,
> FSDirectoryPool.patch, FSIndexInput.patch, FSIndexInput.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 file.
> This could mitigate any MT performance drop caused by reducing the number of
> files in the index format.
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