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As shown in Figure 8, there was a cross between increasing performance efficiency due to more flow control policy, and decreasing resource usage pre-sized by the frontpressure layers. Front-pressure layers rely on pre-allocating and auto-scaling instances to prevent incidents caused by any throughput changes. Besides, back-pressure can maintain the throughput near the instance¡¯s maximum capacity and guarantee QoS during scaling events, by mitigating message overflow into a manageable early drop reply stream, until more capacity is provisioned.
this trade between the overhead of backpressure with the redundant gap for front pressure to obtain the finest output KPI.
Therefore in an unstable mesh, we advise each service layer should enable a backpressure strategy. This is a fair trade of performance for instance safety
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IEEE/ICACT20240417 Slide.25
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