Caerus: NIMBLE Task Scheduling for Serverless Analytics


Hong Zhang, UC Berkeley; Yupeng Tang and Anurag Khandelwal, Yale University; Jingrong Chen, Duke University; Ion Stoica, UC Berkeley


Serverless platforms facilitate transparent resource elasticity and fine-grained billing, making them an attractive choice for data analytics. We find that while server-centric analytics frameworks typically optimize for job completion time (JCT), resource utilization and isolation via inter-job scheduling policies, serverless analytics requires optimizing for JCT and cost of execution instead, introducing a new scheduling problem. We present Caerus, a task scheduler for serverless analytics frameworks that employs a fine-grained NIMBLE scheduling algorithm to solve this problem. NIMBLE efficiently pipelines task executions within a job, minimizing execution cost while being Pareto-optimal between cost and JCT for arbitrary analytics jobs. To this end, NIMBLE models a wide range of execution parameters --- pipelineable and non-piplineable data dependencies, data generation, consumption and processing rates, etc. --- to determine the ideal task launch times. Our evaluation results show that in practice, Caerus is able to achieve both optimal cost and JCT for queries across a wide range of analytics workloads.

NSDI '21 Open Access Sponsored by NetApp

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@inproceedings {265037,
author = {Hong Zhang and Yupeng Tang and Anurag Khandelwal and Jingrong Chen and Ion Stoica},
title = {Caerus: {NIMBLE} Task Scheduling for Serverless Analytics},
booktitle = {18th {USENIX} Symposium on Networked Systems Design and Implementation ({NSDI} 21)},
year = {2021},
isbn = {978-1-939133-21-2},
url = {},
publisher = {{USENIX} Association},
month = apr,