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From Shawn Heisey <>
Subject Re: Delta Import - Cleaning Index
Date Tue, 05 Aug 2014 13:41:18 GMT
On 8/5/2014 7:31 AM, Jako de Wet wrote:
> Thanks for the insight. Why the size increase when not specifying the clean
> parameter then? The PK for the documents remain the same throughout the
> whole import process.
> Should a full optimize combine all the results into one and decrease the
> physical size of the core?

When you delete all documents, all of the original segments have no
undeleted documents in them, so Lucene knows it can completely remove
those segments even when there is no merging.  I don't know what
situations will trigger such automatic removal, but Lucene is smart
enough to know that it can do it.

If you simply rely on uniqueKey replacement, the space taken up by
deleted documents cannot be automatically recovered, because there are
good documents in those segments.  Only a merge can recover the space,
and only an optimize can guarantee any specific document's segment will
be merged.


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