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Date: Tue, 24 Aug 2010 12:34:16 -0400 (EDT)
From: "Nick Barkas (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Created: (LUCENE-2620) Queries with too many asterisks
 causing 100% CPU usage
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Queries with too many asterisks causing 100% CPU usage
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                 Key: LUCENE-2620
                 URL: https://issues.apache.org/jira/browse/LUCENE-2620
             Project: Lucene - Java
          Issue Type: Bug
          Components: Search
    Affects Versions: 3.0.1
         Environment: Debian Lenny with Tomcat 5.5 and Mac OS X 10.6 with Tomcat 6, probably others
            Reporter: Nick Barkas
         Attachments: lucene-asterisks.diff

If a search query has many adjacent asterisks (e.g. fo**************obar), I can get my webapp caught in a loop that does not seem to end in a reasonable amount of time and may in fact be infinite. For just a few asterisks the query eventually does return some results, but as I add more it takes a longer and longer amount of time. After about six or seven asterisks the query never seems to finish. Even if I abort the search, the thread handling the troublesome query continues running in the background and pinning a CPU.

I found the problem in src/java/org/apache/lucene/search/WildcardTermEnum.java on Lucene 3.0.1 and it looks like 3.0.2 ought to be affected as well. I'm not sure about trunk, though. I have a patch that fixes the problem for me in 3.0.1.

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