[rabbitmq-discuss] Flow control issue when shovelling messages between data centres

[SimonT]

It appears that part of the problem is that the shovel mechanism is slow to 
consume due to a load balancer issue which I won't go into here. 

I'd be interested though to understand better the relationship is between 
down-stream queue size / consumption rate and flow control. For example, if 
the consumer is not keeping up and the queue is growing, will this increase 
the chance of flow control at the publisher. Also what is the effect of TTL 
on the queue - e.g. will a shorter TTL result in less up-streamm flow 
control?
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