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https://issues.apache.org/jira/browse/LUCENE-4752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604272#comment-13604272
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Adrien Grand commented on LUCENE-4752:
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bq. Is it possible to make fieldInfos final?
Sure. I removed the final keyword because it was easier to hack up a quick
patch but this can definitely be fixed.
bq. Adrien, perhaps add a SortingSegmentMerger to the sorter package? Or at
least add a test that verifies merges keep things sorted?
I'll do that in the next patches!
bq. And finally i think it would be way better to provide whatever 'hook' is
needed for this kinda stuff rather than allow subclassing of segmentmerger.
I'm fine with that option too, I need to think more about how to name it and
where to plug it.
In addition to the API, I think something important to validate is whether
sorting the segments to merge is viable and doesn't blow up memory or indexing
time... I started working on this (LUCENE-4830 for memory and LUCENE-4839 for
complexity) and will run some indexing benchmarks with the Wikipedia corpus to
see how it behaves compared to natural merging.
> Merge segments to sort them
> ---------------------------
>
> Key: LUCENE-4752
> URL: https://issues.apache.org/jira/browse/LUCENE-4752
> Project: Lucene - Core
> Issue Type: New Feature
> Components: core/index
> Reporter: David Smiley
> Assignee: Adrien Grand
> Attachments: LUCENE-4752.patch
>
>
> It would be awesome if Lucene could write the documents out in a segment
> based on a configurable order. This of course applies to merging segments
> to. The benefit is increased locality on disk of documents that are likely to
> be accessed together. This often applies to documents near each other in
> time, but also spatially.
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