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https://issues.apache.org/jira/browse/LOG4J2-1296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15184965#comment-15184965
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Remko Popma commented on LOG4J2-1296:
-------------------------------------

This problem has now been addressed.
* LogEventProxy (the snapshot of the LogEvent taken by AsyncAppender) now makes 
a copy of the Message if the Message is reusable
* AsyncLoggerConfig now calls Log4jLogEvent.makeMessageImmutable() before 
passing the LogEvent to another thread
* RingbufferLogEvent.createMemento() now makes a copy of the Message if the 
Message is reusable

> Add MessageFactory that reuses a cached Message instance
> --------------------------------------------------------
>
>                 Key: LOG4J2-1296
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1296
>             Project: Log4j 2
>          Issue Type: New Feature
>          Components: API
>    Affects Versions: 2.5
>            Reporter: Remko Popma
>            Assignee: Remko Popma
>
> As discussed in LOG4J2-1270, all current MessageFactory implementations 
> create new temporary Message objects. A GC-free configuration needs a 
> different MessageFactory that reuses Message instances.
> When Messages are being reused, async logging components need to be aware of 
> this and ensure the Message _content_  (rather than the Message instance 
> itself) is passed to the background thread. However, Messages that are not 
> reusable should be passed to the background thread unchanged.



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