We are using a AtLeastOnceDelivery persistent actor. We are getting a huge 
volume of unconfirmed messages and this is causing an OutOfMemoryError if 
this number is too large.


Is there a way we can configure the AtLeastOnceDelivery actor to keep the 
unconfirmed messages on disk rather than keeping them all in memory until 
they are confirmed?

Or better is there an alternative to AtLeastOnceDelivery that gets around 
this limitation?


Also we have played around with the max number of unconfirmed messages 
setting. Although reducing this value prevents an OutOfMemoryError it does 
however results in subsequent messages being discarded.

We would like to have a solution where the unconfirmed messages are not 
kept in memory, but constantly flushed out to file without any loss of 
messages.


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