[Xapian-devel] Duplicate docids in mset

Olly Betts olly at survex.com
Tue Mar 11 20:54:16 GMT 2008


On Tue, Mar 11, 2008 at 07:15:07PM +0100, Jean-Francois Dockes wrote:
> I seem to be seeing a (very unfrequent) case where I get the same document
> twice inside a result list (same xapian docid as last and first entries of
> consecutive msets).
> 
> This was reported by a user running tests on a "CACM test collection and
> evaluating the performance with trec eval software", not under normal
> usage, where it would probably not be noticed.
> 
> Is there a known condition that would cause this ? Is it worth investigating ?

Assuming that the database hasn't been modified between the two
searches, this shouldn't happen - the "split" results should be the same
as the "unsplit".

So it would be interesting to find out what's causing this.  Is it
repeatable with the same query on the same data?

Cheers,
    Olly



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