[jira] [Commented] (LUCENE-5897) performance bug ("adversary") in StandardTokenizer

["Robert Muir (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14104202#comment-14104202 ] 

Robert Muir commented on LUCENE-5897:
-------------------------------------

it seems stuck here:
{noformat}
TRACE 301319:
        org.apache.lucene.analysis.standard.StandardTokenizerImpl.getNextToken(StandardTokenizerImpl.java:756)
        org.apache.lucene.analysis.standard.StandardTokenizer.incrementToken(StandardTokenizer.java:150)
        org.apache.lucene.analysis.core.TestStandardAnalyzer.testWorthyAdversary(TestStandardAnalyzer.java:286)
{noformat}

This is in generated code: so I don't yet know if its something about our grammar or something in jflex itself?

> performance bug ("adversary") in StandardTokenizer
> --------------------------------------------------
>
>                 Key: LUCENE-5897
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5897
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>
> There seem to be some conditions (I don't know how rare or what conditions) that cause StandardTokenizer to essentially hang on input: I havent looked hard yet, but as its essentially a DFA I think something wierd might be going on.
> An easy way to reproduce is with 1MB of underscores, it will just hang forever.
> {code}
>   public void testWorthyAdversary() throws Exception {
>     char buffer[] = new char[1024 * 1024];
>     Arrays.fill(buffer, '_');
>     int tokenCount = 0;
>     Tokenizer ts = new StandardTokenizer();
>     ts.setReader(new StringReader(new String(buffer)));
>     ts.reset();
>     while (ts.incrementToken()) {
>       tokenCount++;
>     }
>     ts.end();
>     ts.close();
>     assertEquals(0, tokenCount);
>   }
> {code} 



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