λFS: A Scalable and Elastic Distributed File System Metadata Service using Serverless Functions
Pages 394 - 411
Abstract
The metadata service (MDS) sits on the critical path for distributed file system (DFS) operations, and therefore it is key to the overall performance of a large-scale DFS. Common "serverful" MDS architectures, such as a single server or cluster of servers, have a significant shortcoming: either they are not scalable, or they make it difficult to achieve an optimal balance of performance, resource utilization, and cost. A modern MDS requires a novel architecture that addresses this shortcoming.
To this end, we design and implement γFS, an elastic, high-performance metadata service for large-scale DFSes. γFS scales a DFS metadata cache elastically on a FaaS (Function-as-a-Service) platform and synthesizes a series of techniques to overcome the obstacles that are encountered when building large, stateful, and performance-sensitive applications on FaaS platforms. γFS takes full advantage of the unique benefits offered by FaaS---elastic scaling and massive parallelism---to realize a highly-optimized metadata service capable of sustaining up to 4.13X higher throughput, 90.40% lower latency, 85.99% lower cost, 3.33X better performance-per-cost, and better resource utilization and efficiency than a state-of-the-art DFS for an industrial workload.
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March 2023
430 pages
ISBN:9798400703942
DOI:10.1145/3623278
- Chair:
- Tor Aamodt,
- Program Chair:
- Michael M Swift,
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