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Date: Wed, 3 Jun 2009 04:44:07 -0700 (PDT)
From: "Earwin Burrfoot (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-1651) Make IndexReader.open() always
 return MSR to simplify (re-)opens.
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    [ https://issues.apache.org/jira/browse/LUCENE-1651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715908#action_12715908 ] 

Earwin Burrfoot commented on LUCENE-1651:
-----------------------------------------

bq. Patch looks good Earwin, thanks!
I believe the readers can be cleaned up further, but I'm short on time and don't want to delay it for another week or two, and then rebase it against updated trunk once again. Might as well do that under a separate issue.

bq. I think we should now rename MultiSegmentReader to DirectoryIndexReader?
Maybe DirectoryReader instead of DirectoryIndexReader? But all three are in fact okay with me, I really don't have any preference here.


> 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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