I'm trying to figure out what could possibly account for buggy results for
wildcard searches in certain fringe cases (running MarkLogic 7.0-4.3).
I have two servers running on the same data set of 166K documents, with
identical host, database and app server settings so far as I can determine (for
anything related to word query at least). Ordinarily, wildcard searches on
words
return the exact same number of matches on both hosts. For example:
H1 H2
democra* 1579 1579
demo* 4354 4354
dem* 16866 16866
But there are certain word stems that produce buggy results on H2, matching all
documents when they shouldn't. Actually I should say "word stem" because the
buggy results all involve words starting in "rel". For example:
H1 H2
religions* 138 138
religion* 2448 166618
relig* 3810 166618
reli* 14608 166618
rel* 39888 39888
re* 150890 166618
relia* 1084 166618
relie* 8306 166618
relo* 156 166618
relm* 3 3
I have tried unsuccesfully to find other letter sequences that exhibit the bug
in a wildcard search or that give different result counts for H2. So far it's
only certain "rel-" examples.
My next step will be a forced reindex of the database on H2 to see if that
helps, but before I do that I wonder if anyone has a clue what might account
for
this behavior.
Even odder, on two entirely different systems running an entirely different
MarkLogic software instance, "rel-" searches are also showing discrepancies,
though I haven't researched that one as thoroughly. Some deep-level indexing
bug, possibly?
David
--
David Sewell, Editorial and Technical Manager
ROTUNDA, The University of Virginia Press
PO Box 400314, Charlottesville, VA 22904-4314 USA
Email: dsew...@virginia.edu Tel: +1 434 924 9973
Web: http://rotunda.upress.virginia.edu/
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