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https://issues.apache.org/jira/browse/LUCENE-4364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13449557#comment-13449557
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Robert Muir commented on LUCENE-4364:
-------------------------------------
We should put the IllegalStateException back. there is no sense in pretending
to support slices from clones, its totally untested and not useful.
If its useful somehow in the future and we have good tests thats different, but
currently its useless and untested.
> MMapDirectory makes too many maps for CFS
> -----------------------------------------
>
> Key: LUCENE-4364
> URL: https://issues.apache.org/jira/browse/LUCENE-4364
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-4364.patch, LUCENE-4364.patch, LUCENE-4364.patch,
> LUCENE-4364.patch, LUCENE-4364.patch
>
>
> While looking at LUCENE-4123, i thought about this:
> I don't like how mmap creates a separate mapping for each CFS slice, to me
> this is way too many mmapings.
> Instead I think its slicer should map the .CFS file, and then when asked for
> an offset+length slice of that, it should be using .duplicate()d buffers of
> that single master mapping.
> then when you close the .CFS it closes that one mapping.
> this is probably too scary for 4.0, we should take our time, but I think we
> should do it.
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