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https://issues.apache.org/jira/browse/LUCENE-2766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrzej Bialecki updated LUCENE-2766:
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Attachment: LUCENE-2766.patch
Patch and unit test that implements getSequentialSubReaders. The other part (a
suitable MergePolicy) is left as an exercise for the reader for now ;)
> ParallelReader should support getSequentialSubReaders if possible
> -----------------------------------------------------------------
>
> Key: LUCENE-2766
> URL: https://issues.apache.org/jira/browse/LUCENE-2766
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Andrzej Bialecki
> Attachments: LUCENE-2766.patch
>
>
> Applications that need to use ParallelReader can't currently use per-segment
> optimizations because getSequentialSubReaders returns null.
> Considering the strict requirements on input indexes that ParallelReader
> already enforces it's usually the case that the additional indexes are built
> with the knowledge of the primary index, in order to keep the docId-s
> synchronized. If that's the case then it's conceivable that these indexes
> could be created with the same number of segments, which in turn would mean
> that their docId-s are synchronized on a per-segment level. ParallelReader
> should detect such cases, and in getSequentialSubReader it should return an
> array of ParallelReader-s created from corresponding segments of input
> indexes.
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