Minimal (aka fine grained) locking
----------------------------------

                 Key: LOG4J2-3
                 URL: https://issues.apache.org/jira/browse/LOG4J2-3
             Project: Log4j 2
          Issue Type: Wish
          Components: Core
            Reporter: Curt Arnold


Most components of log4j 1.2 are not inherently thread-safe but depend on locks 
that are acquired after the threshold check and are not released until 
processing is completed.  Unless the AsyncAppender is used, this effectively 
limits log4j 1.2 to handlng only one logging request at a time.

Core classes in log4j 2.0 should not depend on external synchronization for 
thread safety.  
Immutable classes should be preferred in the logging pipeline.  
Class attributes (aka @Immutable and @ThreadSafe) should be used to document 
thread-safety.



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