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https://issues.apache.org/jira/browse/LUCENE-2771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-2771:
--------------------------------

    Attachment: LUCENE-2771_needsCache.patch

here is a start to the new approach i described.

it needs some cleanup and optimization, but mostly just to add a cache to 
ParallelReader
like i did to SlowMultiReaderWrapper... 

all tests pass, this is much simpler.

> 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_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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