[jira] [Created] (LOG4J2-1349) Garbage-free ThreadContext map and stack

["Remko Popma (JIRA)" <ji...@apache.org>]

Remko Popma created LOG4J2-1349:
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             Summary: Garbage-free ThreadContext map and stack
                 Key: LOG4J2-1349
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1349
             Project: Log4j 2
          Issue Type: Improvement
          Components: API
    Affects Versions: 2.5
            Reporter: Remko Popma


The current ThreadContext map and stack implementations allocate temporary objects. This ticket is to investigate and track the work for alternative implementations that are garbage-free.

Both DefaultThreadContextMap and DefaultThreadContextStack are copy-on-write data structures: each modification replaces the ThreadLocal object with a modified copy. The advantage of this approach is that there is no need to make a copy for each LogEvent.

Also, DefaultThreadContextMap uses a JDK map, the JDK collections tend to allocate a lot of temporary objects.




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