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From "Uwe Schindler (JIRA)" <>
Subject [jira] Updated: (LUCENE-1472) DateTools.stringToDate() can cause lock contention under load
Date Tue, 25 Jan 2011 21:33:43 GMT


Uwe Schindler updated LUCENE-1472:

    Fix Version/s: 4.0
         Assignee: Uwe Schindler

This is not longer highest priority, but the fix using ThreadLocal without close seems to
be the best possibility. We use this in our local applications, too when we have a pool of
DateFormats. I will take care on applying this patch.

In general, this NumericRangeQuery and NumericField should be used when dates should be indexed.

> DateTools.stringToDate() can cause lock contention under load
> -------------------------------------------------------------
>                 Key: LUCENE-1472
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: 2.3.2
>            Reporter: Mark Lassau
>            Assignee: Uwe Schindler
>            Priority: Minor
>             Fix For: 3.1, 4.0
> 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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