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It has been reported that holding a lock on `InternalLoggerRegistry` during the creation of a logger can cause performance loss and deadlocks. The logger constructor can trigger property lookups and other pluggable operations, we don't entirely control. The fix to apache#3252 only covered one of these cases. This change moves the instantiation of new `Logger`s outside the write lock. While in some cases, this will cause multiple instantiations of loggers with the same parameters, all such loggers are functionally equivalent. On the other hand, the change allows the creation of different loggers in parallel. Closes apache#3399
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Some additional info: here are the timings for running Infinispan's core testsuite on my laptop:
Any difference is just attributable to noise. |
vy
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Jan 31, 2025
| @SuppressWarnings("unchecked") | ||
| private void processQueue() { | ||
| for (WeakValue<V> v = (WeakValue<V>) queue.poll(); v != null; v = (WeakValue<V>) queue.poll()) { | ||
| map.remove(v.getKey()); |
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@tristantarrant, methods accessed while holding a read-lock (e.g., getLogger()) might end up mutating the map, which is not thread-safe. Am I mistaken?
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This PR includes and supersedes #3418
It fixes the issue of dangling
WeakReferences, which are not being replaced causing excessive write lock acquisition by introducing a (very limited)WeakValuesHashMapto store thename -> loggermappings.I've tested this successfully with Infinispan's core testsuite.
I've kept @ppkarwasz 's original commit and mine separate, but they should really be squashed together.
Closes #3399