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https://issues.apache.org/jira/browse/LUCENE-4057?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley updated LUCENE-4057:
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    Fix Version/s:     (was: 4.7)
                   4.8

> Add Codec.merge()
> -----------------
>
>                 Key: LUCENE-4057
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4057
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: 4.0-ALPHA
>            Reporter: Robert Muir
>             Fix For: 4.8
>
>
> Currently individual codec components can override/optimize merging, e.g. the 
> stored fields impl
> uses bulk copying when possible, and so on.
> SegmentMerger contains the logic for merging the different codec components, 
> for example it does
> mergeFieldInfos(), then mergeFields(), mergeTerms(), and so on. Each of these 
> methods interacts
> with the codec apis to finish the merge.
> I think it would be cleaner if SegmentMerger called a new method, 
> Codec.merge(), which contained
> this logic instead. This way someone could customize this process. I think we 
> could probably even 
> push some of the impl-dependent stuff (like matchingSegmentReaders) into the 
> impl and out of SegmentMerger.
> Setting this for 4.1, I think it would be a nice cleanup but I don't plan on 
> working on this immediately, 
> and I think we can do this in a backwards compatible way in a minor release.



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