Just a quick comment from our experience: since we have quite a lot of data indexed in our Solr, we take some extra measures to ensure, no bogus wild-card queries are accepted by the system (for instance *, **, *** etc). And that is done in the QueryParser. Wanted to mention this approach as one way of handling simple query security checks.
-- Dmitry On Tue, Nov 13, 2012 at 6:22 AM, Jack Krupansky <j...@basetechnology.com>wrote: > Be sure to realize that even with reverse wildcard support, the user can > add a trailing wildcard as well (double-ended wildcard) and then you are > back in the same boat. > > The overall idea is that: 1) Hardware is much faster than just 3 or 4 > years ago, and 2) even though document counts are getting much larger, the > number of unique terms (which is all that matters for wildcard performance) > does not tend to grow as fast as document count grows. And, some fields > have a much more limited vocabulary (unique terms), so a leading wildcard > is not necessarily a big performance hit. > > Technology advances. We should permit our mindsets to advance as well. > > -- Jack Krupansky > > > -----Original Message----- From: François Schiettecatte > Sent: Monday, November 12, 2012 2:38 PM > To: solr-user@lucene.apache.org > Subject: Re: Is leading wildcard search turned on by default in Solr 3.6.1? > > > John > > You can still use leading wildcards even if you dont have the > ReversedWildcardFilterFactory in your analysis but it means you will be > scanning the entire dictionary when the search is run which can be a > performance issue. If you do use ReversedWildcardFilterFactory you wont > have that performance issue but you will increase the overall size of your > index. Its a tradeoff. > > When I looked into it for a site I built I decided that the tradeoff was > not worth it (after benchmarking) given how few leading wildcards searches > it was getting. > > Best regards > > François > > > On Nov 12, 2012, at 5:33 PM, johnmu...@aol.com wrote: > > >> >> Hi, >> >> >> I'm migrating from Solr 1.2 to 3.6.1. I used the same analyzer as I was, >> and re-indexed my data. I did not add >> solr.**ReversedWildcardFilterFactory to my index analyzer, but yet >> leading wild cards are working!! Does this mean it's turned on by default? >> If so, how do I turn it off, and what are the implication of leaving ON? >> Won't my searches be slower and consume more memory? >> >> >> Thanks, >> >> >> --MJ >> >> -- Regards, Dmitry Kan
