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

["Mark Lassau (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-1472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12651899#action_12651899 ] 

Mark Lassau commented on LUCENE-1472:
-------------------------------------

The following methods would potentially suffer contention as well depending on usage patterns of the particular app:
* stringToTime()
* dateToString()
* timeToString()


> 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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