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https://issues.apache.org/jira/browse/LUCENE-2771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934181#action_12934181
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Uwe Schindler commented on LUCENE-2771:
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bq. In fact, reopen is completely unrelated to this issue, or the cache here at
all... so i don't understand your comment.
If you reopen an reader you can reuse the cache partly (so instead of copying
all norms from all subreaders again, you can sometimes simply override a part
of only a refreshed subreader).
> Remove norms() support from non-atomic IndexReaders
> ---------------------------------------------------
>
> Key: LUCENE-2771
> URL: https://issues.apache.org/jira/browse/LUCENE-2771
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Uwe Schindler
> Fix For: 4.0
>
> Attachments: LUCENE-2771.patch, LUCENE-2771.patch, LUCENE-2771.patch,
> LUCENE-2771_needsCache.patch
>
>
> Spin-off from LUCENE-2769:
> Currently all IndexReaders support norms(), but the core of Lucene never uses
> it and its even dangerous because of memory usage. We should do the same like
> with MultiFields and factor it out and throw UOE on non-atomic readers.
> The SlowMultiReaderWrapper can then manage the norms. Also ParallelReader
> needs to be fixed.
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