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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-2970) SpecialOperations.isFinite can have TERRIBLE TERRIBLE runtime in certain situations
Date Wed, 16 Mar 2011 16:55:30 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir resolved LUCENE-2970.
---------------------------------

    Resolution: Fixed

Committed revision 1082200.

Thanks for the review Mike!

> SpecialOperations.isFinite can have TERRIBLE TERRIBLE runtime in certain situations
> -----------------------------------------------------------------------------------
>
>                 Key: LUCENE-2970
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2970
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>             Fix For: 4.0
>
>         Attachments: LUCENE-2970.patch
>
>
> in an application of mine, i experienced some very slow query times with finite automata
(all the DFAs are acyclic)
> It turned out, the slowdown is some terrible runtime in SpecialOperations.isFinite <--
this is used to determine if the DFA is acyclic or not.
> (in this case I am talking about even up to minutes of cpu).

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