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https://issues.apache.org/jira/browse/LOG4J2-1475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15391740#comment-15391740
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Hikaru Abe commented on LOG4J2-1475:
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if log message has many '${' token, the following code takes exponential time.
https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;a=blob;f=log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/MessagePatternConverter.java;h=75af44c8e7d6966bb832832fa4b764789a570758;hb=refs/heads/master#l100
i think the "Lookups" on %message behavior is undocumented, and common users
expect to do property substitution only on message header (in configuration of
PatternLayout), not on body. it leads information leaks.
> High CPU utilization if large log message contains '${'
> -------------------------------------------------------
>
> Key: LOG4J2-1475
> URL: https://issues.apache.org/jira/browse/LOG4J2-1475
> Project: Log4j 2
> Issue Type: Bug
> Components: Layouts, Pattern Converters
> Affects Versions: 2.6.2
> Environment: JDK 7u80
> Reporter: Hikaru Abe
> Priority: Minor
>
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