MDCUnitOfWork behaviour incorrect with nested routes
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Key: CAMEL-4274
URL: https://issues.apache.org/jira/browse/CAMEL-4274
Project: Camel
Issue Type: Bug
Components: camel-core
Affects Versions: 2.8.0
Reporter: Yaytay
Priority: Minor
MDCUnitOfWork.clear() removes any content set by MDCUnitOfWork from MDC.
If there are two separate exchange running at the same time in the same thread,
as happens when a ProduceTemplate is used from Java, this is incorrect because
the MDC of the parent is cleared after the child completes.
Conceptually the MDC should be a stack, but MDC only accepts strings so the
simplest thing to do is for MDCUnitOfWork to replace the previous values in
clear().
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