[LOG4J2-2433] Support MDCs with Kotlin coroutines

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Kotlin 1.0.0
• Fix Version/s: Kotlin 1.1.0
• Component/s: Kotlin API
• Assignee: Unassigned
• Reporter: Raman Gupta
• Created: 04/Sep/18 21:17
• Updated: 28/Aug/21 19:40
• Resolved: 28/Aug/21 19:38

Description

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 native module to add support for log4j2 MDC using the same pattern, that does not require having SLF4J and the slf4j-log4j2 implementation on the classpath.

Issue Links

• links to: GitHub Pull Request #8