Not All Resources are Visible

Abstract

With the rapid development of cloud computing, the increasing scale of clusters and task parallelism put forward higher requirements on the scheduling capability at scale. To this end, the shared-state scheduler architecture has emerged as the popular solution for large-scale scheduling due to its high scalability and utilization. In such an architecture, a central resource state view periodically updates the global cluster status to distributed schedulers for parallel scheduling. However, the schedulers obtain broader resource views at the cost of intermittently stale states, rendering resources released invisible to schedulers until the next view update. These fleeting resource fragments are referred to as shadow resources in this paper. Current shared-state solutions overlook or fail to systematically utilize the shadow resources, leaving a void in fully exploiting these invisible resources.