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https://issues.apache.org/jira/browse/LOG4J2-3198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17457679#comment-17457679
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Carter Kozak commented on LOG4J2-3198:
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[~rgoers] This was resolved by 001aaada7dab82c3c09cde5f8e14245dc9d8b454 in
2.15.0, perhaps I neglected to move the status to closed?
> Message lookups should be disabled by default
> ---------------------------------------------
>
> Key: LOG4J2-3198
> URL: https://issues.apache.org/jira/browse/LOG4J2-3198
> Project: Log4j 2
> Issue Type: Improvement
> Components: Layouts
> Affects Versions: 2.14.1
> Reporter: Carter Kozak
> Assignee: Carter Kozak
> Priority: Major
> Fix For: 2.16.0
>
>
> Lookups in messages are confusing, and muddy the line between logging APIs
> and implementation. Given a particular API, there's an expectation that a
> particular shape of call will result in specific results. However, lookups in
> messages can be passed into JUL and will result in resolved output in log4j
> formatted output, but not any other implementations despite no direct
> dependency on those implementations.
> There's also a cost to searching formatted message strings for particular
> escape sequences which define lookups. This feature is not used as far as
> we've been able to tell searching github and stackoverflow, so it's
> unnecessary for every log event in every application to burn several cpu
> cycles searching for the value.
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