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List:       log4j-dev
Subject:    [jira] [Commented] (LOG4J2-83) Please provide means to disable MDC functionality on a global level.
From:       "Joern Huxhorn (JIRA)" <jira () apache ! org>
Date:       2012-09-30 11:31:07
Message-ID: 2021532811.145229.1349004667989.JavaMail.jiratomcat () arcas
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    [ https://issues.apache.org/jira/browse/LOG4J2-83?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466445#comment-13466445 \
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Joern Huxhorn commented on LOG4J2-83:
-------------------------------------

Not really since the map wouldn't be empty at all in my cases.

We use MDC quite extensively, i.e. 10-15 key-value-pairs per event. We never ever \
read values from the MDC in our application code. The MDC is used purely for logging \
and not as some magic bucket for moving around objects across method calls. Because \
of this, it would be feasible to disable MDC handling altogether. I suspect that most \
code is using the MDC like this, i.e. only writing, never reading (I've never seen \
any MDC values of libraries in my events).

Chances are quite high that an application would work exactly the same way with MDC \
disabled, just a lot faster. While disabling MDC could lead to application breakage \
if the application is indeed reading from the MDC I don't understand the problem \
about this. I'd just not disable the MDC in that case. This is comparable to pulling \
the network cable for an application that is using the network. Yep, it will cause \
breakage. Just don't do it in those cases.  
> Please provide means to disable MDC functionality on a global level.
> --------------------------------------------------------------------
> 
> Key: LOG4J2-83
> URL: https://issues.apache.org/jira/browse/LOG4J2-83
> Project: Log4j 2
> Issue Type: New Feature
> Reporter: Joern Huxhorn
> 
> Disabling MDC evaluation can have drastic effects on event size while sending them \
> over the wire or dumping them to disk. When disabled, all calls to MDC-related \
> methods will instead call NOP implementations, i.e. no ThreadLocals would be used \
> at all.

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