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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-2770) Optimize SegmentMerger to work on atomic (Segment)Readers where possible
Date Fri, 19 Nov 2010 18:22:14 GMT


Michael McCandless commented on LUCENE-2770:

Looks great Uwe!

> Optimize SegmentMerger to work on atomic (Segment)Readers where possible
> ------------------------------------------------------------------------
>                 Key: LUCENE-2770
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>            Priority: Minor
>             Fix For: 3.1, 4.0
>         Attachments: LUCENE-2770-3x.patch, LUCENE-2770-3x.patch, LUCENE-2770.patch, LUCENE-2770.patch,
> This is a spin-off from LUCENE-2769:
> Currently SegmentMerger has some optimizations when it merges segments that are 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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