Raman Gupta created LOG4J2-2433:
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             Summary: Support MDCs with Kotlin coroutines
                 Key: LOG4J2-2433
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2433
             Project: Log4j 2
          Issue Type: New Feature
          Components: Kotlin API
    Affects Versions: Kotlin 1.0.0
            Reporter: Raman Gupta


Create support for log4j2 MDC when used with Kotlin coroutines. Since 
coroutines do not guarantee which underlying thread is executing code after a 
continuation, a standard ThreadLocal is not sufficient to keep the MDC context.

Kotlin coroutines have a mechanism by which "coroutine local" data can be 
stored. See the reference implementation for SLF4J here:

https://github.com/Kotlin/kotlinx.coroutines/tree/master/integration/kotlinx-coroutines-slf4j

We should implement an optional module to add support for log4j2 MDC using the 
same pattern.



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