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https://issues.apache.org/jira/browse/LUCENE-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733831#action_12733831
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Tim Smith commented on LUCENE-1076:
-----------------------------------
i suppose you could do a preliminary round of merging that would merge together
segments that share doc store/termvector data
once this preliminary round of merging is done, you would then no longer have
the need to slice the doc stores up, just merge them together (contiguous or
non-contiguous wouldn't matter anymore, however if a "segmented session" still
exists higher up, this would prevent you from selecting these segments, or
newer segments)
it might even be desirable to have a "commit()" optionally perform this merging
prior to the commit finishing as this will result in each commit producing one
segment, regardless of the number of flushes that were done under the hood
> Allow MergePolicy to select non-contiguous merges
> -------------------------------------------------
>
> Key: LUCENE-1076
> URL: https://issues.apache.org/jira/browse/LUCENE-1076
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.3
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Attachments: LUCENE-1076.patch
>
>
> I started work on this but with LUCENE-1044 I won't make much progress
> on it for a while, so I want to checkpoint my current state/patch.
> For backwards compatibility we must leave the default MergePolicy as
> selecting contiguous merges. This is necessary because some
> applications rely on "temporal monotonicity" of doc IDs, which means
> even though merges can re-number documents, the renumbering will
> always reflect the order in which the documents were added to the
> index.
> Still, for those apps that do not rely on this, we should offer a
> MergePolicy that is free to select the best merges regardless of
> whether they are continuguous. This requires fixing IndexWriter to
> accept such a merge, and, fixing LogMergePolicy to optionally allow
> it the freedom to do so.
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