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https://issues.apache.org/jira/browse/LUCENE-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539208
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Michael Busch commented on LUCENE-743:
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{quote}
How about if SegmentReader.close() always calls Norm.decRef(),
immediately, for each Norm is has open? EG you could implement
doCloseUnsharedResources in SegmentReader and do it there). This way,
{quote}
Hmm I was thinking about this before (that's actually why I put that
method in there). But I don't think this is gonna work. For example,
let's say we use a MultiReader that has two SegmentReader SR1 and SR2.
Now only SR2 changed, we reopen the MR which increases the refCount on
SR1, because it shares that SR. Now we close the old MultiReader, which
calls close() on SR1. If now SegmentReader.close() calls Norm.decRef(),
then it will close the norms even though they are still used by the new
MultiReader.
> 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.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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