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https://issues.apache.org/jira/browse/LUCENE-2771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933925#action_12933925
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Michael McCandless commented on LUCENE-2771:
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I think there may be hope for ParallelReader.
Ie, if the readers added to it a "congruent" (consist same-sized
sub-readers), which I think (?) is common, then we can implement
getSequentialSubReaders as simply returning an array of
ParallelReaders of the sub-readers.
If they are not congruent then it's effectively a
SlowMultiReaderWrapper.
> 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
>
>
> 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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