ppkarwasz opened a new pull request, #3802:
URL: https://github.com/apache/logging-log4j2/pull/3802
This change disables the sharing of formatted timestamps between threads in
`InstantPatternThreadLocalCachedFormatter`.
Previously, a mutable `StringBuilder` was shared across threads via a cached
object. This could lead to situations where one thread ("owner") was modifying
the builder while another thread was reading from it, resulting in inaccurate
or truncated timestamps.
This fix ensures that only thread-local instances are used, preventing
concurrency issues and improving timestamp correctness under load.
This change is similar in nature to #1485 and fixes #3792.
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