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https://issues.apache.org/jira/browse/LUCENE-1651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715888#action_12715888
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Michael McCandless commented on LUCENE-1651:
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Hmm -- let me figure out what happened. Sorry for the false alarm!
> Make IndexReader.open() always return MSR to simplify (re-)opens.
> -----------------------------------------------------------------
>
> Key: LUCENE-1651
> URL: https://issues.apache.org/jira/browse/LUCENE-1651
> Project: Lucene - Java
> Issue Type: Task
> Affects Versions: 2.9
> Reporter: Earwin Burrfoot
> Assignee: Michael McCandless
> Fix For: 2.9
>
> Attachments: LUCENE-1651-tag.patch, LUCENE-1651.patch,
> LUCENE-1651.patch
>
>
> As per discussion in mailing list, I'm making DirectoryIndexReader.open()
> always return MSR, even for single-segment indexes.
> While theoretically valid in the past (if you make sure to keep your index
> constantly optimized) this feature is made practically obsolete by
> per-segment collection.
> The patch somewhat de-hairies (re-)open logic for MSR/SR.
> SR no longer needs an ability to pose as toplevel directory-owning IR.
> All related logic is moved from DIR to MSR.
> DIR becomes almost empty, and copying two or three remaining fields over to
> MSR/SR, I remove it.
> Lots of tests fail, as they rely on SR returned from IR.open(), I fix by
> introducing SR.getOnlySegmentReader static package-private method.
> Some previous bugs are uncovered, one is fixed in LUCENE-1645, another
> (partially fixed in LUCENE-1648) is fixed in this patch.
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