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https://issues.apache.org/jira/browse/LUCENE-753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625050#action_12625050
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Michael McCandless commented on LUCENE-753:
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Interesting...
Are you really sure you're not accidentally closing the searcher before calling
Searcher.docFreqs? Are you calling docFreqs directly from your app?
It looks like MMapIndexInput.close() is a noop so it would not have detected
calling Searcher.docFreqs after close, whereas NIOFSdirectory (and the normal
FSDirectory) will.
If you try the normal FSDirectory do you also an exception like this?
Incidentally, what sort of performance differences are you noticing between
these three different ways of accessing an index in the file system?
> 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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