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https://issues.apache.org/jira/browse/LOG4J2-3034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17293227#comment-17293227
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Ralph Goers commented on LOG4J2-3034:
-------------------------------------
Yeah - you want the PatternSelector.
{code:java}
<Configuration status="WARN" name="XMLConfig">
<Appenders>
<Console name="STDOUT">
<PatternLayout>
<LevelPatternSelector defaultPattern="[%-5level] %c{1.} %msg%n">
<PatternMatch key="DEBUG" pattern="[%-5level] %c{1.} ======
%C{1.}.%M:%L %X %msg ======%n"/>
<PatternMatch key="TRACE" pattern="[%-5level] %c{1.} ======
%C{1.}.%M:%L %X %msg ======%n"/>
</MarkerPatternSelector>
</PatternLayout>
</Console>
</Appenders>
<Loggers>
<Root level="debug">
<AppenderRef ref="STDOUT" />
</Root>
</Loggers>
</Configuration>
{code}
This should output without the classname, method name, line number and MDC for
everything except DEBUG and TRACE messages, which would include them. The
[doc|http://logging.apache.org/log4j/2.x/manual/layouts.html#Pattern_Selectors]
shows other examples. If you use a ScriptPatternSelector then your script just
returns the key of the pattern you want to use or null to use the default.
> Change Log format based on currently active level
> -------------------------------------------------
>
> Key: LOG4J2-3034
> URL: https://issues.apache.org/jira/browse/LOG4J2-3034
> Project: Log4j 2
> Issue Type: New Feature
> Reporter: Caleb Cushing
> Priority: Major
>
> I'm not talking about `patternSelector`, I thought that was what I wanted,
> but I didn't understand it, I think. What I'm talking about is, if my root
> current active level is, for example, `error`, I want a format without MDC,
> if it's `debug` I want a format with MDC. meaning in error level, and all
> levels I would want the MDC when my lowest level is `debug` or trace. If it's
> higher than debug I want no MDC in my output. Pretty sure this is relatively
> easy to achieve with a programmatic configuration, but not without. The use
> case is to get far more verbose logging when debugging as opposed to normal
> "production" mode.
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