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https://issues.apache.org/jira/browse/LUCENE-1585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865719#action_12865719
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Shai Erera commented on LUCENE-1585:
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bq. Make sure you fix the whitespace - some indents are now tabs or 8 spaces,
but should be 2.
That's weird. I'll check it again. Can you point me to a specific place where
you've noticed that?
About concurrency - do you mean we should separate the Dir and Term APIs, to be
PPP -> return DirPP -> return TermPP? Not necessarily these names but a chain
of calls to get to the TermPP? It can work, but what guarantees that PPP ->
DirPP is synced? The application will still need to sync the "per-Dir-PP"
instance by a ThreadLocal or something, so what exactly do we gain here?
Perhaps I misunderstood your point - if so, can you please clarify?
> 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_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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