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https://issues.apache.org/jira/browse/LOG4J2-1866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16009953#comment-16009953
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Gary Gregory commented on LOG4J2-1866:
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Thank you for your additional patch.
Personally, I find the syntax hard to use. If you look at the {{level}} option,
it is simpler, more obvious and does not require the number of keys to match
the number of defaults:
{noformat}
p|level{level=label, level=label, ...}
{noformat}
I feel that that {{key=default}} syntax would be much easier for users to grok.
> Add default value to MdcPatternConverter
> -----------------------------------------
>
> Key: LOG4J2-1866
> URL: https://issues.apache.org/jira/browse/LOG4J2-1866
> Project: Log4j 2
> Issue Type: Bug
> Components: Pattern Converters
> Affects Versions: 2.8.2
> Reporter: Izek Greenfield
> Labels: converter, mdc, pattern
> Attachments: Add_default_value_to_MDC_converter.patch,
> Add_documentation_.patch
>
>
> When using %X in a pattern I can't define default value if the value does not
> exist in MDC.
> I will be great to be able to define one like:
> {code:title=pattern|borderStyle=solid}
> %X{key}{hello}
> {code}
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