sman-81 commented on a change in pull request #544:
URL: https://github.com/apache/logging-log4j2/pull/544#discussion_r666251291



##########
File path: 
log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/NamePatternConverter.java
##########
@@ -29,6 +32,11 @@
      */
     private final NameAbbreviator abbreviator;
 
+    /**
+     * Cache of previously encountered inputs (keys) and conversion results 
(values).
+     */
+    private final Map<String, String> conversionCache = new 
ConcurrentHashMap<>();

Review comment:
       Thanks for your feedback. I've added a system property to make the cache 
size configurable and updated the PR.




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