ppkarwasz commented on code in PR #3418:
URL: https://github.com/apache/logging-log4j2/pull/3418#discussion_r1932324793
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log4j-core/src/main/java/org/apache/logging/log4j/core/util/internal/InternalLoggerRegistry.java:
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@@ -147,44 +147,43 @@ public Logger computeIfAbsent(
return logger;
}
+ // Creating a logger is expensive and might cause lookups and locks,
possibly deadlocks:
+ // https://github.com/apache/logging-log4j2/issues/3252
+ // https://github.com/apache/logging-log4j2/issues/3399
+ //
+ // Creating loggers without a lock, allows multiple threads to create
loggers in parallel, which also
+ // improves performance.
+ // Since all loggers with the same parameters are equivalent, we can
safely return the logger from the
+ // thread that finishes first.
+ Logger newLogger = loggerSupplier.apply(name, messageFactory);
Review Comment:
I use `newLogger` in a lambda, so it must be effectively `final`.
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