An Efficient Fault Tolerant Workflow Scheduling Approach using Replication Heuristics and Checkpointing in the Cloud.

Scientific workflows have been predominantly used for complex and large scale data analysis and scientific computation/automation and the need for robust workflow scheduling techniques has grown considerably. But, most of the existing workflow scheduling algorithms do not provide the required reliability and robustness. In this paper, a new fault tolerant workflow scheduling algorithm that learns replication heuristics in an unsupervised manner has been proposed. Furthermore, the use of light weight synchronized checkpointing enables efficient resubmission of failed tasks and ensures workflow completion even in precarious environments. The proposed technique improves upon metrics like Resource Wastage and Resource Usage in comparison to the Replicate-All algorithm, while maintaining an acceptable increase in Makespan as compared to the vanilla Heterogeneous Earliest Finish Time (HEFT).