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Posted to issues@commons.apache.org by "Pascal Schumacher (JIRA)" <ji...@apache.org> on 2017/11/10 16:42:01 UTC
[jira] [Closed] (LANG-1355) TimeZone.getTimeZone() in
FastDateParser causes resource contention
[ https://issues.apache.org/jira/browse/LANG-1355?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Pascal Schumacher closed LANG-1355.
-----------------------------------
> TimeZone.getTimeZone() in FastDateParser causes resource contention
> -------------------------------------------------------------------
>
> Key: LANG-1355
> URL: https://issues.apache.org/jira/browse/LANG-1355
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.time.*
> Affects Versions: 3.6
> Environment: Windows
> Reporter: Keith Boone
> Assignee: Charles Honton
> Fix For: 3.7
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> Under heavy load we are seeing contention in FastDateParser.parse() on calls to TimeZone.getTimeZone(). TimeZone.getTimeZone() is a synchronized static in the Oracle JVM.
> Our proposed solution is to add a class TimeZoneCache containing a single method getTimeZone() which gets the requested time zone from a ConcurrentMap, and if not present, looks it up via TimeZone.getTimeZone() and caches it before returning it.
> Then replace calls to TimeZone.getTimeZone() in FastDateParser ( and whereever else) to calls to TimeZoneCache.getTimeZone().
> The reason to add a separate class is because it can also be used by other applications which heavily parse or format or do other things where TimeZone is repeatedly needed.
> Under extreme load we have seen an 50:1 improvement in calls to FastDateParser.parse(). This saves about a ms/call in our test environment, and reduces contention.
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