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Erasure coding has been recognized as a powerful method to mitigate delaysdue to slow or straggling nodes in distributed systems. This work shows thaterasure coding of data objects can flexibly handle skews in the request rates.Coding can help boost the \emph{service rate region}, that is, increase theoverall volume of data access requests that the system can handle. This paperaims to postulate the service rate region as an important consideration in thedesign of erasure-coded distributed systems. We highlight several open problemsthat can be grouped into two broad threads: 1) characterizing the service rateregion of a given code and finding the optimal request allocation, and2)designing the underlying erasure code for a given service rate region. Ascontributions along the first thread, we characterize the rate regions ofmaximum-distance-separable, locally repairable, and Simplex codes. We show theeffectiveness of hybrid codes that combine replication and erasure coding interms of code design. We also discover fundamental connections betweenmulti-set batch codes and the problem of maximizing the service rate region.

Service Rate Region: A New Aspect of Coded Distributed System Design