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From "Michael McCandless (JIRA)" <>
Subject [jira] Updated: (LUCENE-1737) Always use bulk-copy when merging stored fields and term vectors
Date Sat, 27 Nov 2010 22:13:38 GMT


Michael McCandless updated LUCENE-1737:

    Attachment: LUCENE-1737.patch

This turned out to be very simply -- a tiny patch!

> Always use bulk-copy when merging stored fields and term vectors
> ----------------------------------------------------------------
>                 Key: LUCENE-1737
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 4.0
>         Attachments: LUCENE-1737.patch
> Lucene has nice optimizations in place during merging of stored fields
> (LUCENE-1043) and term vectors (LUCENE-1120) whereby the bytes are
> bulk copied to the new segmetn.  This is much faster than decoding &
> rewriting one document at a time.
> However the optimization is rather brittle: it relies on the mapping
> of field name to number to be the same ("congruent") for the segment
> being merged.
> Unfortunately, the field mapping will be congruent only if the app
> adds the same fields in precisely the same order to each document.
> I think we should fix IndexWriter to assign the same field number for
> a given field that has been assigned in the past.  Ie, when writing a
> new segment, we pre-seed the field numbers based on past segments.
> All other aspects of FieldInfo would remain fully dynamic.

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