Yes by default the application thread will block until a slot becomes available 
in the queue. 

Yes this is configurable: see

(Shameless plug) Every java main() method deserves

> On Dec 20, 2017, at 2:03, Fröstl, Christian <> 
> wrote:
> Hi,
> I currently don’t find any documentation regarding the fallback methods of 
> the log4j2 async logger.
> What happens when the AsyncLogger.RingBufferSize is too small to log all 
> entries from a burst? Will the application fall back into sync logging and 
> slow down the application or will the new messages be dropped?
> Is this a configurable behaviour?
> Kind regards,
> Christian
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