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https://issues.apache.org/jira/browse/LUCENE-5897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14104272#comment-14104272
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Robert Muir commented on LUCENE-5897:
-------------------------------------
I spent some time trying to debug it, didn't get very far.
I know at least you can substitute any Extend_Num_Let for the underscore and it
hangs. I don't yet know if other word break categories would have a similar
issue, maybe even in other contexts.
> 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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