Daniel Feist created LOG4J2-2212:
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Summary: 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
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.
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