Critical Review of Cloud Schedulers in Homogeneous and Heterogeneous Environments: Taxonomy, Challenges, and Future Directions

Scheduling in cloud computing is a paramount activity that not only schedules the jobs but also focuses on resource provisioning, management, allocation, mapping, load balancing, etc., as well as prioritizing the tasks. The critical review through this paper emphasizes different environments in cloud resources, such as heterogeneous and homogeneous, and also discusses different task and resource scheduling approaches for the same. The overview of cloud and cloud schedulers gives a clear idea about the different tasks of schedulers. In this structured review, which selects the appropriate resources by following the effective review methodology with a specific motivation, different existing scheduling approaches are discussed. Based on the analysis of existing studies, the current research challenges and future directions are also presented in this study. Overall, the taxonomy, challenges, and future directions of the cloud schedulers in homogeneous and heterogeneous environments provide a clear understanding to the readers in order to research advancements in this research area.