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https://issues.apache.org/jira/browse/LUCENE-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14171502#comment-14171502
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Uwe Schindler commented on LUCENE-5970:
---------------------------------------

Here is the talk: 
http://de.slideshare.net/lucenerevolution/is-your-index-reader-really-atomic-or-maybe-slow

> Remove IndexReaderContext/CompositeReaderContext/AtomicReaderContext
> --------------------------------------------------------------------
>
>                 Key: LUCENE-5970
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5970
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>
> This hierarchy is mega-confusing, has a overcomplicated hierarchy, and is 
> full of bugs.
> For example, in a two-segment index with one document in each:
> {code}
> context.docbase: 1
> context.reader().getContext().docBase: 0
> {Code}
> There is just no need for all this. We can replace it all with 'docbase'. For 
> the esoteric stuff solr wants to do, like top-level crap, it can do this with 
> its own filterreader instead, rather than pushing the complexity into lucene.



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