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https://issues.apache.org/jira/browse/LOG4J2-3115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17379848#comment-17379848
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Markus Spann commented on LOG4J2-3115:
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Please note: a discussion on this feature is taking place at the [PR
544|https://github.com/apache/logging-log4j2/pull/544] on Github.
> Remember previously computed strings in NamePatternConverter
> ------------------------------------------------------------
>
> Key: LOG4J2-3115
> URL: https://issues.apache.org/jira/browse/LOG4J2-3115
> Project: Log4j 2
> Issue Type: Improvement
> Components: Core
> Reporter: Markus Spann
> Priority: Minor
>
> Implementations of {{NamePatternConverter}} are responsible for abbreviating
> logger and class names according to a configured pattern.
> Abbreviation can be quite complex and computationally expensive (consider
> abbreviating x parts of a fully qualified class name to y number of leftmost
> characters).
> Example:
> The pattern {{%logger\{1.}}} abbreviates logger name
> {{org.apache.logging.log4j.core.pattern.NameAbbreviator}} to
> {{o.a.l.l.c.p.NameAbbreviator}}
> The strings to abbreviate (logger and class names) extremely likely stem from
> a limited set of candidates. I would like to suggest that results are cached
> to prevent computation over and over again e.g. in every log statement of a
> logger.
> I have a small patch ready that addresses the issue.
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