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From "Earwin Burrfoot (JIRA)" <>
Subject [jira] Created: (LUCENE-1651) Make always return MSR to simplify (re-)opens.
Date Thu, 21 May 2009 15:46:45 GMT
Make always return MSR to simplify (re-)opens.

                 Key: LUCENE-1651
             Project: Lucene - Java
          Issue Type: Task
    Affects Versions: 2.9
            Reporter: Earwin Burrfoot

As per discussion in mailing list, I'm making 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
Lots of tests fail, as they rely on SR returned from, 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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