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Date: Fri, 2 Nov 2007 07:43:50 -0700 (PDT)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-743) IndexReader.reopen()
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    [ https://issues.apache.org/jira/browse/LUCENE-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539598 ] 

Michael McCandless commented on LUCENE-743:
-------------------------------------------


OK, reviewed the latest patch:

* In this code:
  {code}
// singleNormFile means multiple norms share this file
if (fileName.endsWith("." + IndexFileNames.NORMS_EXTENSION)) {
  clone.singleNormStream = d.openInput(fileName, readBufferSize);            
}
  {code}
  I think the comment should be removed (it doens't apply) and also
  won't this incorrectly open the singleNormStream more than once if
  more than one field does not have separate norms?  I think you should
  init that to null and then only reopen it, once, if it's still null?

* In MultiSegmentReader, the logic that copies over unchanged norms
  from the old norms cache can be simplified.  I think you can just
  look up the old Norm instance & the new Norm instance and if they
  are == then you can copy bytes over?  This would also let you remove
  "sharedNorms" entirely which is good because it's not a just a
  boolean thing anymore since some Norm instances are shared and some
  aren't.

* I think you also need to override decRef (and add
  decRefReaderNotNorms) to SegmentReader?  Because now there is a
  mismatch: incRef incr's the Norm RC's, but, decRef does not.  So I
  think norms are not getting closed?  I think we should modify the
  "assertReaderClosed()" in the unit test to verify (when appropriate)
  that also the RC of all Norm instances is also 0 (ie
  assertTrue(SR.normsClosed())).  Then, make sure SR calls
  referencedSegmentReader.decRefReaderNotNorms instead of decRef.  I
  think you then don't need to track "closedNorms" boolean, at all.
  You simply always decRef the norms whenever SR.decRef is called.
  The doCloseUnsharedResources is still needed to close the
  singleNormStream.


> IndexReader.reopen()
> --------------------
>
>                 Key: LUCENE-743
>                 URL: https://issues.apache.org/jira/browse/LUCENE-743
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Otis Gospodnetic
>            Assignee: Michael Busch
>            Priority: Minor
>             Fix For: 2.3
>
>         Attachments: IndexReaderUtils.java, lucene-743-take2.patch, lucene-743-take3.patch, lucene-743-take4.patch, lucene-743-take5.patch, lucene-743.patch, lucene-743.patch, lucene-743.patch, MyMultiReader.java, MySegmentReader.java, varient-no-isCloneSupported.BROKEN.patch
>
>
> This is Robert Engels' implementation of IndexReader.reopen() functionality, as a set of 3 new classes (this was easier for him to implement, but should probably be folded into the core, if this looks good).

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