Remko Popma created LOG4J2-1272:
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Summary: Improve LoggerConfig's data structure for AppenderControl
objects
Key: LOG4J2-1272
URL: https://issues.apache.org/jira/browse/LOG4J2-1272
Project: Log4j 2
Issue Type: Improvement
Components: Core
Affects Versions: 2.5
Reporter: Remko Popma
Assignee: Remko Popma
LoggerConfig#callAppenders is performance sensitive since it is called for
every LogEvent. Currently the AppenderControl objects are stored in a
CopyOnWriteArraySet which is a very good fit for its intended use (vastly more
reads than writes, writes may happen concurrently in different threads), but
the disadvantage of this data structure is that it creates a new Iterator
instance each time we need to traverse its contents.
We can do slightly better than this by storing the objects in an array and keep
this array in an AtomicReference. The array can be traversed by index without
allocating new objects.
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