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https://issues.apache.org/jira/browse/LUCENE-6501?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler resolved LUCENE-6501.
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Resolution: Fixed
> Flatten subreader structure in ParallelCompositeReader
> ------------------------------------------------------
>
> Key: LUCENE-6501
> URL: https://issues.apache.org/jira/browse/LUCENE-6501
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 5.2
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: Trunk, 5.3
>
> Attachments: LUCENE-6501.patch
>
>
> The current implementation of ParallelCompositeReader reassembles the whole
> subreader structure of the wrapped reader with ParallelLeafReader and
> ParallelCompositeReader.
> This leads to bugs like described in LUCENE-6500. This reaches back to the
> time when this reader was reimplemented for the first time shortly before
> release of 4.0. Shortly afterwards, we completely changed our search
> infrastructure to just call leaves() and working with them. The method
> getSequentialSubReaders was made protected, just to be implemented by
> subclasses (like this one). But no external code can ever call it. Also the
> search API just rely on the baseId in relation to the top-level reader (to
> correctly present document ids). The structure is completely unimportant.
> This issue will therefore simplify ParallelCompositeReader to just fetch all
> LeafReaders and build a flat structure of ParallelLeafReaders from it. This
> also has the nice side-effect, that only the parallel leaf readers must be
> equally sized, not their structure.
> This issue will solve LUCENE-6500 as a side effect. I just opened a new issue
> for discussion and to have this listed as "feature" and not bug.
> In general, we could also hide the ParallelLeafReader class and make it an
> implementation detail. ParallelCompositeReader would be the only entry point
> -> because people could pass any IndexReader structure in, a single
> AtomicReader would just produce a CompositeReader with one leaf. We could
> then also rename it back to ParallelReader (like it was in pre Lucene4).
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