There are various optimizations in Log4j depending on thread locals, including garbage-free context map implementations. Thread locals are known to not get along well with applications running a relatively high number of threads. For one, servlet containers (Tomcat, JBoss, etc.) is a good example of that. Further, as Remko remarked, garbage-free implementations might perform worse – depending on the context, IMO.
On Wed, Aug 4, 2021 at 10:44 PM Joshua S <joshua.spoe...@gmail.com> wrote: > Why isn't garbagefreeThreadContextMap enabled by default? > > That is, does it have any disadvantages? >
