Robert Muir created LUCENE-5897:
-----------------------------------
Summary: 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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