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https://issues.apache.org/jira/browse/LUCENE-4752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13598343#comment-13598343
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Shai Erera commented on LUCENE-4752:
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Well, first if you want to keep the index sorted even per-segment, you need
some hooks so that segments that are merged stay sorted, otherwise, very
quickly they'll just become arbitrarily sorted again.
About global sorting, I think that if we allow to terminate per-segment, then
global sorting has lower priority (though still would be good if we can tackle
that nicely) because it will be just like doing distributed search on a single
index .. no big deal.
> 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
>
> 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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