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https://issues.apache.org/jira/browse/LUCENE-2770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-2770:
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Attachment: LUCENE-2770.patch
> Optimize SegmentMerger to work on atomic (Segment)Readers where possible
> ------------------------------------------------------------------------
>
> Key: LUCENE-2770
> URL: https://issues.apache.org/jira/browse/LUCENE-2770
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Priority: Minor
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2770.patch
>
>
> This is a spin-off from LUCENE-2769:
> Currently SegmentReader has some optimizations when it merges segments that
> are itsself SegmentReaders (e.g. when doing normal indexing or optimizing).
> But when you do IndexWriter.addIndexes(IndexReader...) the listed
> IndexReaders may not really be per-segment. SegmentMerger should track down
> all passed in reads down to the lowest level (Segment)Reader (or other atomic
> readers like SlowMultiReaderWrapper) and then merge. We can then remove most
> MultiFields usage (except term merging itsself) and clean up the code.
> This especially saves lots of memory for merging norms, as no longer the
> duplicate norms arrays are created when MultiReaders are used!
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