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From "Sivan Yogev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4258) Incremental Field Updates through Stacked Segments
Date Mon, 30 Jul 2012 07:56:34 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424736#comment-13424736
] 

Sivan Yogev commented on LUCENE-4258:
-------------------------------------

Seems like in any case we need to have a separation between fields given with UPDATE_FIELD
and REPLACE_FIELD. There are two ways I could think of for implementing this separation. 

The first is at the segment level, where we can have separate "update" and "replace" segments,
where the semantic is that a field in an "update" segment is merged with fields in previous
segments, while a field in a "replace" segment ignores previous segments.

The second option is to separate at the field level, choosing one type as the default behavior
(maybe this can be configurable) and marking the fields of the non-default type by altering
the field name or some other solution.

I lean towards the segment level separation, since it requires less conventions and will probably
require less work for Codec implementations to handle.
                
> Incremental Field Updates through Stacked Segments
> --------------------------------------------------
>
>                 Key: LUCENE-4258
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4258
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Sivan Yogev
>   Original Estimate: 2,520h
>  Remaining Estimate: 2,520h
>
> Shai and I would like to start working on the proposal to Incremental Field Updates outlined
here (http://markmail.org/message/zhrdxxpfk6qvdaex).

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