Daniel Knittl-Frank created LOGBACK-1476:
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Summary: Avoid synchronized blocks when copying MDC to a
function-local map
Key: LOGBACK-1476
URL: https://jira.qos.ch/browse/LOGBACK-1476
Project: logback
Issue Type: Improvement
Reporter: Daniel Knittl-Frank
Assignee: Logback dev list
When setting or duplicating the MDC context map, a synchronized map is used.
This incurs the overhead of locking when putting key-value pairs into the map.
This overhead can be avoided, because the map is method-local and only a single
thread can access it a single time.
Delay wrapping the map in a synchronizedMap until before it leaves the scope of
the method.
You can find the proposed changes in
[https://github.com/qos-ch/logback/pull/462|https://github.com/qos-ch/logback/pull/462/files]
I have not performed any benchmarks and would appreciate if somebody could
write some. Maybe the JVM is already clever enough to detect this useless
synchronization and elides the lock?
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