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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