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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