ClusterLess: Deadline-Aware Serverless Workflow Orchestration on Federated Edge Clusters
Reza Farahani, Mario Colosi, Ilir Murturi, Stefan Nastic, Massimo Villari, Schahram Dustdar, Radu Prodan

TL;DR
ClusterLess is a novel deadline-aware orchestration system for federated multi-edge serverless workflows, improving completion times and deadline satisfaction in heterogeneous edge environments.
Contribution
It introduces a new federated orchestration method integrating intra and inter-cluster coordination for serverless workflows with strict deadlines.
Findings
Reduces workflow completion time by up to 40%.
Increases deadline satisfaction from below 50% to over 90%.
Confines deadline violations to single-digit seconds.
Abstract
The recent convergence of edge computing, serverless execution, and Kubernetes (K8s) based container orchestration has enabled the processing of application workflows close to data sources. While effective within a single edge cluster, existing schemes do not generalize to federated multi edge environments, where multiple workflows execute concurrently under strict end to end (E2E) deadline constraints. This paper introduces ClusterLess, a deadline aware serverless workflow orchestration method for federated multi edge K8s clusters. ClusterLess manages the E2E lifecycle of workflow execution, including dependency analysis, execution mode selection, and resource aware placement. To this end, it integrates structured intra cluster orchestration with a leader selected, super master driven intercluster coordination layer, determining where and how each workflow function should be executed…
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