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https://issues.apache.org/jira/browse/LOG4J2-3487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17649906#comment-17649906
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Dave Messink commented on LOG4J2-3487:
--------------------------------------
FYI - The regression also messes up garbage-free logging as well. (The cost of
acquiring the current stack trace.)
> The LoggerConfig includeLocation defaults to true in 2.17.2
> -----------------------------------------------------------
>
> Key: LOG4J2-3487
> URL: https://issues.apache.org/jira/browse/LOG4J2-3487
> Project: Log4j 2
> Issue Type: Bug
> Components: Configuration
> Affects Versions: 2.17.2
> Reporter: Dave Messink
> Priority: Major
> Attachments: log4j2-3487-1.patch, log4j2-3487-2.patch,
> log4j2-3487.patch
>
>
> We've found services running 2.17.2 to be slower than 2.17.1. A heat map
> indicates a StackWalker in log4j.
> I found that the code that Logger plugin calls into has changed. In 2.17.1
> the default config for includeLocation is based only on the configured value.
> In 2.17.2 it's based on the config value if present, but then defaults to
> !(context instanceof AsyncLoggerContext).
> Since none of our Logger elements declare includeLocation - the default
> behavior has changed causing all LogEvents to include their location.
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