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From "Shai Erera (JIRA)" <>
Subject [jira] Resolved: (LUCENE-1585) Allow to control how payloads are merged
Date Fri, 14 May 2010 12:12:44 GMT


Shai Erera resolved LUCENE-1585.

    Lucene Fields: [New, Patch Available]  (was: [New])
       Resolution: Fixed

Committed revision 944214 (3x).
Committed revision 944220 (trunk).

Thanks Michael for starting this !

> Allow to control how payloads are merged
> ----------------------------------------
>                 Key: LUCENE-1585
>                 URL:
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>            Reporter: Michael Busch
>            Assignee: Shai Erera
>            Priority: Minor
>             Fix For: 3.1, 4.0
>         Attachments: LUCENE-1585_3x.patch, LUCENE-1585_3x.patch, LUCENE-1585_3x.patch,
LUCENE-1585_3x.patch, LUCENE-1585_3x.patch, LUCENE-1585_trunk.patch, LUCENE-1585_trunk.patch,
> Lucene handles backwards-compatibility of its data structures by
> converting them from the old into the new formats during segment
> merging. 
> Payloads are simply byte arrays in which users can store arbitrary
> data. Applications that use payloads might want to convert the format
> of their payloads in a similar fashion. Otherwise it's not easily
> possible to ever change the encoding of a payload without reindexing.
> So I propose to introduce a PayloadMerger class that the SegmentMerger
> invokes to merge the payloads from multiple segments. Users can then
> implement their own PayloadMerger to convert payloads from an old into
> a new format.
> In the future we need this kind of flexibility also for column-stride
> fields (LUCENE-1231) and flexible indexing codecs.
> In addition to that it would be nice if users could store version
> information in the segments file. E.g. they could store "in segment _2
> the term a:b uses payloads of format x.y".

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