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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1585) Allow to control how payloads are merged
Date Mon, 10 May 2010 10:06:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865719#action_12865719
] 

Shai Erera commented on LUCENE-1585:
------------------------------------

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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