DateTools.stringToDate() can cause lock contention under load
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                 Key: LUCENE-1472
                 URL: https://issues.apache.org/jira/browse/LUCENE-1472
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Search
    Affects Versions: 2.3.2
            Reporter: Mark Lassau
            Priority: Minor


Load testing our application (the JIRA Issue Tracker) has shown that threads 
spend a lot of time blocked in DateTools.stringToDate().

The stringToDate() method uses a singleton SimpleDateFormat object to parse the 
dates.
Each call to parse is *synchronized* because SimpleDateFormat is not thread 
safe.



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