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https://issues.apache.org/jira/browse/LOG4J2-2212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16336390#comment-16336390
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ASF subversion and git services commented on LOG4J2-2212:
---------------------------------------------------------
Commit 93e97932c871a94486b8dc1c16f6ae3a77184871 in logging-log4j2's branch
refs/heads/master from [~garydgregory]
[ https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;h=93e9793 ]
[LOG4J2-2212]Unnecessary contention in
CopyOnWriteSortedArrayThreadContextMap.
[LOG4J2-2213] Unnecessary contention in
GarbageFreeSortedArrayThreadContextMap.
> Unnecessary contention in CopyOnWriteSortedArrayThreadContextMap
> ----------------------------------------------------------------
>
> Key: LOG4J2-2212
> URL: https://issues.apache.org/jira/browse/LOG4J2-2212
> Project: Log4j 2
> Issue Type: Improvement
> Affects Versions: 2.10.0
> Reporter: Daniel Feist
> Assignee: Gary Gregory
> Priority: Major
> Attachments: Screen Shot 2018-01-23 at 14.23.33.png
>
>
> The following method retrieves the value of a system property for each and
> every map that is created. While maps are cached/reused where possible via
> thread local this method is still used a lot in runtime.
> {{protected StringMap createStringMap() {}}
> {{ return new
> SortedArrayStringMap(PropertiesUtil.getProperties().getIntegerProperty}}{{PROPERTY_NAME_INITIAL_CAPACITY,
> DEFAULT_INITIAL_CAPACITY));}}
> {{}}}
> Under concurrency, this introduces unnecessary contention due to
> java.util.Properties monitor in HashTable.contains when retrieving system
> property, as seen below.
> !Screen Shot 2018-01-23 at 14.23.33.png!
>
>
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