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Date: Wed, 24 Nov 2010 13:07:15 -0500 (EST)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Updated: (LUCENE-1737) Always use bulk-copy when merging
 stored fields and term vectors
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     [ https://issues.apache.org/jira/browse/LUCENE-1737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-1737:
---------------------------------------

    Fix Version/s: 4.0

> Always use bulk-copy when merging stored fields and term vectors
> ----------------------------------------------------------------
>
>                 Key: LUCENE-1737
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1737
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 4.0
>
>
> 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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