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https://issues.apache.org/jira/browse/LUCENE-325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12558636#action_12558636
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Michael McCandless commented on LUCENE-325:
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I think we should resurrect this: I agree it's useful. I'll take it &
tentatively mark it 2.4 (hopefully I can make time by then!).
The original patch would simply merge one segment "in place". I think we can
improve this a bit by merging any adjacent series of segments that have
deletions? This would still preserve docID ordering, but would also accomplish
some merging as a side effect (I think a good thing).
> [PATCH] new method expungeDeleted() added to IndexWriter
> --------------------------------------------------------
>
> Key: LUCENE-325
> URL: https://issues.apache.org/jira/browse/LUCENE-325
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: CVS Nightly - Specify date in submission
> Environment: Operating System: Windows XP
> Platform: All
> Reporter: John Wang
> Assignee: Lucene Developers
> Priority: Minor
> Fix For: 2.4
>
> Attachments: attachment.txt, IndexWriter.patch, IndexWriter.patch,
> TestExpungeDeleted.java
>
>
> We make use the docIDs in lucene. I need a way to compact the docIDs in
> segments
> to remove the "holes" created from doing deletes. The only way to do this is
> by
> calling IndexWriter.optimize(). This is a very heavy call, for the cases where
> the index is large but with very small number of deleted docs, calling
> optimize
> is not practical.
> I need a new method: expungeDeleted(), which finds all the segments that have
> delete documents and merge only those segments.
> I have implemented this method and have discussed with Otis about submitting a
> patch. I don't see where I can attached the patch. I will do according to the
> patch guidleine and email the lucene mailing list.
> Thanks
> -John
> I don't see a place where I can
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