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https://issues.apache.org/jira/browse/LUCENE-1472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12651900#action_12651900
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Mark Lassau commented on LUCENE-1472:
-------------------------------------
[SimpleDateFormat
javadoc|http://java.sun.com/javase/6/docs/api/java/text/SimpleDateFormat.html]:
{quote}
Date formats are not synchronized.
It is recommended to create separate format instances for each thread.
If multiple threads access a format concurrently, it must be synchronized
externally.
{quote}
> 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 parse is *synchronized* because SimpleDateFormat is not thread
> safe.
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