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From "Andrzej Bialecki (JIRA)" <>
Subject [jira] Commented: (LUCENE-2766) ParallelReader should support getSequentialSubReaders if possible
Date Tue, 16 Nov 2010 14:08:13 GMT


Andrzej Bialecki  commented on LUCENE-2766:

Also, the process of creating secondary indexes needs to use the same merge policy, so that
it arrives at segments with exactly the same count and same sequence of docIds...

> ParallelReader should support getSequentialSubReaders if possible
> -----------------------------------------------------------------
>                 Key: LUCENE-2766
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Andrzej Bialecki 
> 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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