Power to the Applications: The Vision of Continuous Decentralized Autoscaling

Martin Straesser, Stefan Geissler, T. Hossfeld, Samuel Kounev
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Abstract

Autoscaling has been one of the most active research areas since the beginning of the cloud computing era. Nearly all previously proposed approaches focus on decision-making based on averaged monitoring values of many service instances at fixed points in time. This limits responsiveness and can lead to service level objective (SLO) violations when the load suddenly increases. Our vision of continuous decentralized autoscaling avoids these issues by giving individual service instances the power to make scaling decisions in a distributed fashion. Each instance performs self-monitoring and evaluates its state. The service instance initiates upscaling if it detects an overload or downscaling if its load is below a specified threshold. By randomly determining scaling timing, we achieve quasi-continuous scaling behavior when multiple service instances are deployed. We discuss challenges regarding analytical modeling, simulation, and real-world evaluation of this approach.
应用程序的力量:持续去中心化自动扩展的愿景
自云计算时代开始以来,自动缩放一直是最活跃的研究领域之一。几乎所有先前提出的方法都是基于固定时间点的许多服务实例的平均监控值进行决策。这限制了响应性,并可能导致在负载突然增加时违反服务水平目标(SLO)。我们对持续去中心化自动扩展的愿景通过赋予单个服务实例以分布式方式做出扩展决策的能力来避免这些问题。每个实例执行自我监视并评估其状态。如果服务实例检测到过载,则启动升级;如果负载低于指定阈值,则启动降级。通过随机确定扩展时间,我们可以在部署多个服务实例时实现准连续扩展行为。我们将讨论有关分析建模、仿真和对该方法的实际评估的挑战。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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