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https://issues.apache.org/jira/browse/LUCENE-4055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13283793#comment-13283793
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Robert Muir commented on LUCENE-4055:
-------------------------------------
{quote}
My comment was about the lack of easy extensibility of the codec-independent
per-segment data (SegmentInfoPerCommit - info about stacked data is per-segment
and per-commit), so LUCENE-3837 will need to use for now the codec-independent
index-global data (SegmentInfos).
{quote}
Well SegmentInfos is just the list of SegmentInfoPerCommit, so I think in the
case of LUCENE-3837 we would just place this data alongside the only other
per-segment-per-commit data: deletes (e.g. we would add something like
updatesGen and updatesCount or whatever).
Sure, we have to bump the file header and what not, but the file is so simple
now in the sense its just a list of segment names, the codec to decode them,
with their deletes, that it wouldn't be a big deal.
And I think per-segment-per-commit data is pretty rare: we only have deletes,
and in the future updates, but I can't imagine lots of other stuff belonging in
this category (versions the per-segment metadata in SI which has been pretty
volatile in the past).
> Refactor SegmentInfo / FieldInfo to make them extensible
> --------------------------------------------------------
>
> Key: LUCENE-4055
> URL: https://issues.apache.org/jira/browse/LUCENE-4055
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/codecs
> Reporter: Andrzej Bialecki
> Assignee: Robert Muir
> Fix For: 4.0
>
> Attachments: LUCENE-4055.patch
>
>
> After LUCENE-4050 is done the resulting SegmentInfo / FieldInfo classes
> should be made abstract so that they can be extended by Codec-s.
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