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Colloquium

Ryan Stutsman
Stanford University


Monday, March 4, 2013
2250 WEB
Refreshments 3:20 p.m.
Lecture 3:40 p.m.


Title: Durability and Crash Recovery for Distributed In-Memory Storage

Abstract
In this talk I will discuss my work on RAMCloud and its novel fast crash recovery system. RAMCloud is a datacenter storage system that stores all data in DRAM. Rather than replicating in DRAM for redundancy, it provides inexpensive durability and availability by recovering quickly after crashes. RAMCloud scatters backup data across thousands of disks, and it harnesses hundreds of servers in parallel to reconstruct lost data. The system uses a log-structured approach for all its data, in DRAM as well as on disk; this provides high performance both during normal operation and during recovery. RAMCloud employs randomized techniques to manage the system in a scalable and decentralized fashion. In a 60-node cluster, RAMCloud recovers 35 GB of data from a failed server in 1.6 seconds. Measurements suggest that the approach will scale to recover larger memory sizes in less time with larger clusters.

BIO
Ryan Stutsman is Ph.D. Candidate at Stanford University and a founding member of the Stanford RAMCloud project. Ryan's work focuses on datacenter software systems; his interests include distributed systems and operating systems.



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