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https://issues.apache.org/jira/browse/LUCENE-5189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13753391#comment-13753391
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Robert Muir commented on LUCENE-5189:
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In the case of old codecs: what we do is pretty tricky for testing:
* we make them read-only officially for the user (so that new segments are
written in the latest format, but old segments can still be read).
* this has the additional caveat they are not "purely" read-only, because
actually we allow liveDocs updates (deletes) against the old formats. so they
are "mostly read-only".
* tests have read-write versions (like in branch4x: PreFlexRWCodec). These
allow in tests for us to override the read-only-ness, and write like the old
formats did and read them in transparently in tests.
* Of course they cannot support the newest features with this "impersonator"
testing we do, but in general we get a lot more test coverage than if we relied
solely upon TestBackwardsCompatibility.
> Numeric DocValues Updates
> -------------------------
>
> Key: LUCENE-5189
> URL: https://issues.apache.org/jira/browse/LUCENE-5189
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/index
> Reporter: Shai Erera
> Assignee: Shai Erera
> Attachments: LUCENE-5189.patch, LUCENE-5189.patch, LUCENE-5189.patch
>
>
> In LUCENE-4258 we started to work on incremental field updates, however the
> amount of changes are immense and hard to follow/consume. The reason is that
> we targeted postings, stored fields, DV etc., all from the get go.
> I'd like to start afresh here, with numeric-dv-field updates only. There are
> a couple of reasons to that:
> * NumericDV fields should be easier to update, if e.g. we write all the
> values of all the documents in a segment for the updated field (similar to
> how livedocs work, and previously norms).
> * It's a fairly contained issue, attempting to handle just one data type to
> update, yet requires many changes to core code which will also be useful for
> updating other data types.
> * It has value in and on itself, and we don't need to allow updating all the
> data types in Lucene at once ... we can do that gradually.
> I have some working patch already which I'll upload next, explaining the
> changes.
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