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https://issues.apache.org/jira/browse/LUCENE-1585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866525#action_12866525
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Michael McCandless commented on LUCENE-1585:
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bq. Still, I think that I'm most cases, PPP will be used for addIndexes calls
and setting it I'm IWC will be a limitation - e.g. you may want to use
different PPPs for different addIndexes calls and opening a new writer just for
that seems too much?
Yeah I agree.
Can we go back to making it a parameter to addIndexes? What was the issue w/
that approach again? Was it just the difficulty of tracking internally which
segments should be mapped and which shouldn't?
Or.. maybe we should leave it as globally settable on IW, since users may want
to rewrite payloads for "ordinary" segment merges...
> Allow to control how payloads are merged
> ----------------------------------------
>
> Key: LUCENE-1585
> URL: https://issues.apache.org/jira/browse/LUCENE-1585
> 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_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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