[LUCENE-1472] DateTools.stringToDate() can cause lock contention under load

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.3.2
• Fix Version/s: 3.1, 4.0-ALPHA
• Component/s: core/search
• Lucene Fields: New
• Assignee: Uwe Schindler
• Reporter: Mark Lassau
• Created: 01/Dec/08 03:35
• Updated: 28/Aug/22 11:55
• Resolved: 25/Jan/11 22:30

Description

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 SimpleDateFormat.parse() is synchronized because SimpleDateFormat is not thread safe.