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https://issues.apache.org/jira/browse/LUCENE-1472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652194#action_12652194
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Doug Cutting commented on LUCENE-1472:
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ThreadLocal?
> DateTools.stringToDate() can cause lock contention under load
> -------------------------------------------------------------
>
> 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 SimpleDateFormat.parse() is *synchronized* because
> SimpleDateFormat is not thread safe.
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