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https://issues.apache.org/jira/browse/LUCENE-4399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand reopened LUCENE-4399:
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bq. which is in my mind, a lesser evil than conditionals inside one "mega-impl"
like before
Agreed.
bq. As far as alternative things in codecs/, I feel it would be best to not add
complication for back-compat, instead to try to keep these implementations
simple.
I think we should do our best so that backwards-compatiblity issues in
lucene-codecs don't happen because of changes in the default Lucene codec or
postings format.
For example, if we release a new Lucene43PostingsFormat, we will either need to
create a new Pulsing43PostingsFormat (to maintain backwards compatibility) or
just replace the current Pulsing40PostingsFormat with Pulsing43PostingsFormat
(if we don't care).
Maybe we could remove Pulsing40PostingsFormat and modify PulsingPostingsFormat
so that it:
- wraps the current default postings format by default,
- writes the wrapped format name at indexing/merge time,
- and then uses it back at read time (similarly to what BloomFilter does).
The only modification required if we release a new Lucene43PostingsFormat will
be to change the default wrapped postings format.
I think we should be able to do this with AppendingCodec and
DirectPostingsFormat too.
> Rename AppendingCodec to Appending40Codec
> -----------------------------------------
>
> Key: LUCENE-4399
> URL: https://issues.apache.org/jira/browse/LUCENE-4399
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.0
>
>
> In order AppendingCodec to follow Lucene codecs version, I think its name
> should include a version number (so that, for example, if we get to releave
> Lucene 4.3 with a new Lucene43Codec, there will also be a new
> Appending43Codec).
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