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Date: Wed, 14 Mar 2012 05:37:44 +0000 (UTC)
From: "Bill Bell (Commented) (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (SOLR-3085) Fix the dismax/edismax stopwords mm
 issue
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    [ https://issues.apache.org/jira/browse/SOLR-3085?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D13228=
990#comment-13228990 ]=20

Bill Bell commented on SOLR-3085:
---------------------------------

We also found another loophole. If we send [* TO *] to edismax we also can =
bring down the server.

Some chars are not being escaped before being sent to SOLR.  Eg I can send =
queries like this to SOLR by searching on ([* TO *] OR [* TO *] OR [* TO *]=
) in the search box - it took 72 seconds to return:
=20
webapp=3D/solr path=3D/select params=3D{d=3D160.9344&start=3D0&q=3D([*+TO+*=
]+OR+[*+TO+*]+OR+[*+TO+*])&pt=3D40.7146,-74.0071&qt=3Dprovidersearchdist&wt=
=3Djson&qq=3Dcity_state_lower:"new+york,+ny"&rows=3D20} hits=3D276442 statu=
s=3D0 QTime=3D72458
               =20
> Fix the dismax/edismax stopwords mm issue
> -----------------------------------------
>
>                 Key: SOLR-3085
>                 URL: https://issues.apache.org/jira/browse/SOLR-3085
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>            Reporter: Jan H=C3=B8ydahl
>              Labels: MinimumShouldMatch, dismax, stopwords
>             Fix For: 3.6, 4.0
>
>
> As discussed here http://search-lucene.com/m/Wr7iz1a95jx and here http://=
search-lucene.com/m/Yne042qEyCq1 and here http://search-lucene.com/m/RfAp82=
nSsla DisMax has an issue with stopwords if not all fields used in QF have =
exactly same stopword lists.
> Typical solution is to not use stopwords or harmonize stopword lists acro=
ss all fields in your QF, or relax the MM to a lower percentag. Sometimes t=
hese are not acceptable workarounds, and we should find a better solution.

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