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From "Robert Muir (JIRA)" <>
Subject [jira] Updated: (LUCENE-2620) Queries with too many asterisks causing 100% CPU usage
Date Tue, 24 Aug 2010 17:13:16 GMT


Robert Muir updated LUCENE-2620:

    Fix Version/s: 2.9.4

Assigning 2.9.x and 3.0.x fix versions as, it seems to loop infinitely (or the runtime is
so terrible it might as well be infinite).

> Queries with too many asterisks causing 100% CPU usage
> ------------------------------------------------------
>                 Key: LUCENE-2620
>                 URL:
>             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
>            Reporter: Nick Barkas
>            Assignee: Robert Muir
>             Fix For: 2.9.4, 3.0.3, 3.1
>         Attachments: LUCENE-2620_3x.patch, 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/ 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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