The doc id will get changed if the segments are merged. The doc id is
more depending on the order of documents being added.
Just think about it. The doc ids are starting from 0 to N. And when some
documents are deleted, they are marked deleted on .del file. So no
change there. When some documents are added, the id is N+1.
Of course, if some documents from other segments are merged. The
documents in one segment will "lose" its doc id.
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Chris Lu
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On 05/13/2010 06:38 PM, Nigel wrote:
The FAQ clearly states that document IDs will not be re-assigned unless
something was deleted.
http://wiki.apache.org/lucene-java/LuceneFAQ#When_is_it_possible_for_document_IDs_to_change.3F
However, a number of other emails and posts I've read mention that
renumbering occurs when segments are merged. Maybe what people mean
is simply that when something is deleted, nothing is immediately renumbered,
and it's not until merge time that the renumbering happens. (This is my
understanding of how it works.)
Just so I'm 100% clear, if I never delete anything, will the IDs ever
change?
Thanks,
Chris
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