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https://issues.apache.org/jira/browse/LOG4J2-3660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17715744#comment-17715744
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Nick Dimiduk commented on LOG4J2-3660:
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Wow [~vy] you beat me to the patch :)
Yes, 2.20.1-SNAPSHOT behaves as I expect. Thanks a lot for your rapid response!
> PatternLayout %notEmpty should consider an MDC with no keys as empty
> --------------------------------------------------------------------
>
> Key: LOG4J2-3660
> URL: https://issues.apache.org/jira/browse/LOG4J2-3660
> Project: Log4j 2
> Issue Type: Bug
> Components: Layouts, Pattern Converters
> Affects Versions: 2.17.2
> Reporter: Nick Dimiduk
> Assignee: Volkan Yazici
> Priority: Major
> Fix For: 2.21.0
>
>
> Introducing MDC logging over on HBASE-27762, we noticed an annoyance when
> writing a patter to ship by default. When the MDC contains no keys,
> {{%notEmpty}} still considers it as non-empty and renders as "{}". I expected
> that {{notEmpty}} would consider the absence of any keys in the MDC as an
> empty object.
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