[jira] Updated: (LUCENE-2766) ParallelReader should support getSequentialSubReaders if possible

["Andrzej Bialecki (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-2766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrzej Bialecki  updated LUCENE-2766:
--------------------------------------

    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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