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Weak Consistency as a Last Resort

机译:弱一致性是不得已的手段

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摘要

It is well-known that using a replicated service requires a tradeoff between availability and consistency. Eventual Lin-earizability represents a midpoint in the design spectrum, since it can be implemented ensuring availability in worst-case periods and providing strong consistency in the regular case. In this paper we show how Eventual Linearizability can be used to support master-worker schemes such as workload sharding in Web applications. We focus on a scenario where sharding maps the workload to a pool of servers spread over an unreliable wide-area network. In this context, Linearizability is desirable, but it may prevent achieving sufficient availability and performance. We show that Eventual Linearizability can significantly reduce the time to completion of the workload in some settings.
机译:众所周知,使用复制服务需要在可用性和一致性之间进行权衡。最终的Lin可极化性代表了设计范围的中点,因为可以实施以确保最坏情况下的可用性并在常规情况下提供强大的一致性。在本文中,我们展示了如何使用最终线性化来支持主工作人员方案,例如Web应用程序中的工作量分片。我们关注的是分片将工作负载映射到分布在不可靠的广域网中的服务器池的场景。在这种情况下,线性化是可取的,但是它可能会阻止获得足够的可用性和性能。我们表明,最终的线性化可以在某些设置中显着减少完成工作量的时间。

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