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https://issues.apache.org/jira/browse/LUCENE-1472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12673771#action_12673771
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Mark Lassau commented on LUCENE-1472:
-------------------------------------
An update for anyone interested:
The test run that showed this contention suffered even worse contention in
another component of our application.
Since we have fixed that component, we have no longer observed contention in
DateTools.stringToDate().
For that reason, this issue is not now considered a priority for us.
> 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
> Fix For: 2.9
>
>
> 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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