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Cloud computing provides a revolutionary new computing paradigm for deploying enterprise applications and Internet services. Rather than operating their own data centers, today cloud users run their applications on the remote cloud infrastructures that are owned and managed by cloud providers. However, the cloud computing paradigm also introduces some new challenges in system management. Cloud users create virtual machine instances to run their specific application logic without knowing the underlying physical infrastructure. On the other side, cloud providers manage and operate their cloud infrastructures without knowing their customers' applications. Due to the decoupled ownership of applications and infrastructures, if a problem occurs, there is no visibility for either cloud users or providers to understand the whole context of the incident and solve it quickly.
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